Neuron class of two interneurons with cell bodies situated in the lateral ganglia, one of the main classes of integrating neuron for the receptors of the amphid sensilla.

lateral ganglion

The left and right lateral ganglia lie beside the nerve ring in the head. They each contain about (30) neuron cell bodies and send their neuronal processes into the ring at its posterior margin either laterally or ventrally via the amphid commissures and ventral ganglion, but form no local neuropil separate from the nerve ring. The lateral ganglia are in close contact with the lateral hypodermal cords.

midbody

body region posterior to the head and anterior to the tail

P7.paa

Anterior daughter cell of P7.pa, fuses into hermaphrodite vulD syncytium.

P7.pppa

Anterior daughter cell of P7.ppp, fuses into hermaphrodite vulA syncytium.

AVM

Neuron class of one sensory neuron, anterior ventral microtubule cell, touch receptor.

H2R.pppa

Anterior daughter cell of H2R.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

ut2 anterior 5R

anterior ut2 cell whose nuclei followed the 5R lineage configuration during development.

V1L.ppa

Anterior daughter cell of V1L.pp, fuses into postembryonic large hypodermal syncytium hyp7.

V1L.ppppa

Anterior daughter cell of V1L.pppp, fuses into postembryonic large hypodermal syncytium hyp7.

V1R.ppppa

Anterior daughter cell of V1R.pppp, fuses into postembryonic large hypodermal syncytium hyp7.

V2L.paa

Anterior daughter cell of V2L.pa, fuses into postembryonic large hypodermal syncytium hyp7.

V2R.paa

Anterior daughter cell of V2R.pa, fuses into postembryonic large hypodermal syncytium hyp7.

V2R.papa

Anterior daughter cell of V2R.pap, fuses into postembryonic large hypodermal syncytium hyp7.

V3L.papa

Anterior daughter cell of V3L.pap, fuses into postembryonic large hypodermal syncytium hyp7.

V3L.pppa

Anterior daughter cell of V3L.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

V3L.ppppa

Anterior daughter cell of V3L.pppp, fuses into postembryonic large hypodermal syncytium hyp7.

V3R.papa

Anterior daughter cell of V3R.pap, fuses into postembryonic large hypodermal syncytium hyp7.

V4L.paa

Anterior daughter cell of V4L.pa, fuses into postembryonic large hypodermal syncytium hyp7.

V4L.pppa

Anterior daughter cell of V4L.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

V5R.a

Anterior daughter cell of V5R, fuses into postembryonic large hypodermal syncytium hyp7.

V6R.pappa

Anterior daughter cell of V5R, fuses into postembryonic large hypodermal syncytium hyp7.

Z1.papapaap

Dorsal uterus; cell of pedigree Z1.papapaap, a precursor of anterior ut4.

Z4.apaapaap

Dorsal uterus; cell of pedigree Z1.papapaap, a precursor of anterior ut4.

H1R.apa

Anterior daughter cell of H1R.ap, fuses into postembryonic large hypodermal syncytium hyp7.

H2L.pa

Anterior daughter cell of H2L.p, fuses into postembryonic large hypodermal syncytium hyp7.

intestinal muscle

intestinal muscle cell, attach to intestine and body wall anterior to anus

TL.apaa

Anterior daughter cell of TL.apa, fuses into postembryonic large hypodermal syncytium hyp7.

ut1 anterior 5R

anterior ut1 cell whose nuclei followed the 5R lineage configuration during development.

ut3 anterior 5R

anterior ut3 cell whose nuclei followed the 5R lineage configuration during development.

ut4 anterior 5L

anterior ut4 cell whose nuclei followed the 5L lineage configuration during development.

ut4 anterior 5R

anterior ut4 cell whose nuclei followed the 5R lineage configuration during development.

V1R.ppa

Anterior daughter cell of V1R.pp, fuses into postembryonic large hypodermal syncytium hyp7.

V2L.a

Anterior daughter cell of V2L, fuses into postembryonic large hypodermal syncytium hyp7.

V2L.papa

Anterior daughter cell of V2L.pap, fuses into postembryonic large hypodermal syncytium hyp7.

V2L.pppa

Anterior daughter cell of V2L.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

V2R.ppppa

Anterior daughter cell of V2R.pppp, fuses into postembryonic large hypodermal syncytium hyp7.

V3L.ppa

Anterior daughter cell of V3L.pp, fuses into postembryonic large hypodermal syncytium hyp7.

V3R.a

Anterior daughter cell of V3R, fuses into postembryonic large hypodermal syncytium hyp7.

V4L.ppa

Anterior daughter cell of V4L.pp, fuses into postembryonic large hypodermal syncytium hyp7.

V4R.papa

Anterior daughter cell of V4R.pap, fuses into postembryonic large hypodermal syncytium hyp7.

V4R.ppa

Anterior daughter cell of V4R.pp, fuses into postembryonic large hypodermal syncytium hyp7.

V4R.pppa

Anterior daughter cell of V4R.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

V4R.ppppa

Anterior daughter cell of V4R.pppp, fuses into postembryonic large hypodermal syncytium hyp7.

V5L.ppa

Anterior daughter cell of V5L.pp, fuses into postembryonic large hypodermal syncytium hyp7

V6L.paa

Anterior daughter cell of V6L.pa, fuses into postembryonic large hypodermal syncytium hyp7.

anterior arcade cell

Interface between pharynx and hypodermis, form anterior part of the buccal cavity.

H2L.ppa

Anterior daughter cell of H2L.pp, fuses into postembryonic large hypodermal syncytium hyp7.

ut1 anterior 5L

anterior ut1 cell whose nuclei followed the 5L lineage configuration during development.

ut3 anterior 5L

anterior ut3 cell whose nuclei followed the 5L lineage configuration during development.

V1L.a

Anterior daughter cell of V1L, fuses into postembryonic large hypodermal syncytium hyp7.

V1L.paa

Anterior daughter cell of V1L.pa, fuses into postembryonic large hypodermal syncytium hyp7.

V1L.pppa

Anterior daughter cell of V1L.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

V1R.pppa

Anterior daughter cell of V1R.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

V2L.ppa

Anterior daughter cell of V2L.pp, fuses into postembryonic large hypodermal syncytium hyp7.

V2R.ppa

Anterior daughter cell of V2R.pp, fuses into postembryonic large hypodermal syncytium hyp7.

V3R.paa

Anterior daughter cell of V3R.pa, fuses into postembryonic large hypodermal syncytium hyp7.

V3R.pppa

Anterior daughter cell of V3R.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

V4L.a

Anterior daughter cell of V4L, fuses into postembryonic large hypodermal syncytium hyp7.

V4L.papa

Anterior daughter cell of V4L.pap, fuses into postembryonic large hypodermal syncytium hyp7.

V4L.ppppa

Anterior daughter cell of V4L.pppp, fuses into postembryonic large hypodermal syncytium hyp7.

V4R.a

Anterior daughter cell of V4R, fuses into postembryonic large hypodermal syncytium hyp7.

V5L.ppppa

Anterior daughter cell of V5Lpppp, fuses into postembryonic large hypodermal syncytium hyp7.

V5R.ppppa

Anterior daughter cell of V5R.pppp, fuses into postembryonic large hypodermal syncytium hyp7.

V6L.ppa

Anterior daughter cell of V6L.pp, fuses into postembryonic large hypodermal syncytium hyp7.

V6R.a

Anterior daughter cell of V6R, fuses into postembryonic large hypodermal syncytium hyp7.

H1L.appa

Anterior daughter cell of H1L.app, fuses into postembryonic large hypodermal syncytium hyp7.

H2R.ppa

Anterior daughter cell of H2R.pp, fuses into postembryonic large hypodermal syncytium hyp7.

TR.aa

Anterior descendent cell of TR.a fuses into postembryonic large hypodermal syncytium hyp7.

V1R.a

Anterior daughter cell of V1R, fuses into postembryonic large hypodermal syncytium hyp7.

V2L.pappa

Anterior daughter cell of V2L.papp, fuses into postembryonic large hypodermal syncytium hyp7.

V2L.ppppa

Anterior daughter cell of V2L.pppp, fuses into postembryonic large hypodermal syncytium hyp7.

V2R.a

Anterior daughter cell of V2R, fuses into postembryonic large hypodermal syncytium hyp7.

V2R.pappa

Anterior daughter cell of V2R.papp, fuses into postembryonic large hypodermal syncytium hyp7.

V2R.pppa

Anterior daughter cell of V2R.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

V3L.paa

Anterior daughter cell of V3L.pa, fuses into postembryonic large hypodermal syncytium hyp7.

V4L.pappa

Anterior daughter cell of V4L.papp, fuses into postembryonic large hypodermal syncytium hyp7.

V5L.a

Anterior daughter cell of V5L, fuses into postembryonic large hypodermal syncytium hyp7.

V5R.ppa

Anterior daughter cell of V5R.pp, fuses into postembryonic large hypodermal syncytium hyp7

V6L.pappa

Anterior daughter cell of V6L.papp, fuses into postembryonic large hypodermal syncytium hyp7.

V6R.paa

Anterior daughter cell of V6R.pa, fuses into postembryonic large hypodermal syncytium hyp7.

V6R.ppa

Anterior daughter cell of V6R.pp, fuses into postembryonic large hypodermal syncytium hyp7.

Z1.papapapa

Dorsal uterus; cell of pedigree Z1.papapapa, a precursor of anterior ut3.

Z1.papapapp

Dorsal uterus; cell of pedigree Z1.papapapp, a precursor of anterior ut2.

lumbar ganglion

The left and right lumbar ganglia lie behind the pre-anal ganglion in the tail, in lateral positions. Each contains 12 neuron cell bodies that send most of their neuronal processes into the ventral nerve cord via lumbar commissures and the pre-anal ganglion. There is no local neuropil in these ganglia in the hermaphrodite, instead they form most synapses in the pre-anal ganglion. Most lumbar neurons have sensory functions. In the adult male tail, these two ganglia gain many additional neurons and have some local neuropil. The lumbar neurons lie in close association with the lateral hypodermis, and most are posterior to the anus.

H1L.apa

Anterior daughter cell of H1L.ap, fuses into postembryonic large hypodermal syncytium hyp7.

H1R.appa

Anterior daughter cell of H1R.app, fuses into postembryonic large hypodermal syncytium hyp7.

H2L.pppa

Anterior daughter cell of H2L.ppp, fuses into postembryonic large hypodermal syncytium hyp7.

H2R.pa

Anterior daughter cell of H2R.p, fuses into postembryonic large hypodermal syncytium hyp7.

posterior arcade cell

Interface between pharynx and hypodermis, form anterior part of the buccal cavity.

ut2 anterior 5L

anterior ut2 cell whose nuclei followed the 5L lineage configuration during development.

V1L.papa

Anterior daughter cell of V1L.pap, fuses into postembryonic large hypodermal syncytium hyp7.

V1L.pappa

Anterior daughter cell of V1L.papp, fuses into postembryonic large hypodermal syncytium hyp7.

V1R.paa

Anterior daughter cell of V1R.paa, fuses into postembryonic large hypodermal syncytium hyp7.

V1R.papa

Anterior daughter cell of V1R.pap, fuses into postembryonic large hypodermal syncytium hyp7.

V1R.pappa

Anterior daughter cell of V1R.papp, fuses into postembryonic large hypodermal syncytium hyp7.

V3L.pappa

Anterior daughter cell of V3L.papp , fuses into postembryonic large hypodermal syncytium hyp7.

V3R.pappa

Anterior daughter cell of V3R.papp, fuses into postembryonic large hypodermal syncytium hyp7.

V3R.ppa

Anterior daughter cell of V3R.pp, fuses into postembryonic large hypodermal syncytium hyp7.

V3R.ppppa

Anterior daughter cell of V3R.pppp, fuses into postembryonic large hypodermal syncytium hyp7.

V4R.paa

Anterior daughter cell of V4R.pa, fuses into postembryonic large hypodermal syncytium hyp7.

V4R.pappa

Anterior daughter cell of V4R.papp, fuses into postembryonic large hypodermal syncytium hyp7.

V6L.a

Anterior daughter cell of V6L, fuses into postembryonic large hypodermal syncytium hyp7.

Z4.apaapapa

Dorsal uterus; cell of pedigree Z1.papapaap, a precursor of anterior ut3.

TR.apaa

Anterior daughter cell of TR.apa, fuses into postembryonic large hypodermal syncytium in male.

Z1.ppaapaa (5R)

Ventral uterus; cell of pedigree Z1.ppaapaa (5R), a precursor of anterior ut4.

Z1.pppppap (5L)

Ventral uterus; cell of pedigree Z1.pppppap (5L), a precursor of anterior ut2.

Z4.aappapa (5L)

Ventral uterus, cell of pedigree Z4.aappapa (5L), a precursor of anterior ut3.

mu_int_R

right intestinal muscle cell, attach to intestine and body wall anterior to anus

TL.aa male

Anterior daughter cell of TL.a, fuses into postembryonic large hypodermal syncytium in male.

V5L.pppapa

Anterior daughter cell of V5L.pppap, fuses into postembryonic large hypodermal syncytium in male.

Z1.ppaaapp (5R)

Ventral uterus; cell of pedigree Z1.ppaaapp (5R), a precursor of anterior ut4.

Z1.ppppppa (5L)

Ventral uterus; cell of pedigree Z1.ppppppa (5L), a precursor of anterior ut3.

Z4.aaaaapa (5R)

Ventral uterus; cell of pedigree Z4.aaaaapa (5R), a precursor of anterior ut2.

Z4.aaaaapp (5R)

Ventral uterus; cell of pedigree Z4.aaaaapp (5R), a precursor of anterior ut2.

TL.aa hermaphrodite

Anterior daughter cell of TL.a, fuses into postembryonic large hypodermal syncytium in hermaphrodite.

V5L.pppaa

Anterior daughter cell of V5L.pppaa, fuses into postembryonic large hypodermal syncytium in male.

V6R.pppaa

Anterior daughter cell of V6R.pppa, fuses into postembryonic large hypodermal syncytium in male.

Z4.aaaaaaa (5R)

Ventral uterus; cell of pedigree Z4.aaaaaaa (5R), a precursor of anterior ut4.

Z4.aaaaaap (5R)

Ventral uterus; cell of pedigree Z4.aaaaaap (5R), a precursor of anterior ut3.

Z4.aappaap (5L)

Ventral uterus, cell of pedigree Z4.aappaap (5L), a precursor of anterior ut2.

Z4.aappppa (5L)

Ventral uterus; cell of pedigree Z4.aappppa (5L), a precursor of anterior ut4.

mu_int_L

left intestinal muscle cell, attach to intestine and body wall anterior to anus

TL.apapa

Anterior daughter cell of TL.apap, fuses into postembryonic large hypodermal syncytium in male.

TR.apapa

Anterior daughter cell of TR.apap, fuses into postembryonic large hypodermal syncytium in male.

V5R.pppaa

Anterior daughter cell of V5R.pppa, fuses into postembryonic large hypodermal syncytium in male.

Z4.aapppaa (5L)

Ventral uterus, cell of pedigree Z4.aapppaa (5L), a precursor of anterior ut4.

V5R.pppapa

Anterior daughter cell of V5R.pppap, fuses into postembryonic large hypodermal syncytium in male.

V6L.papaa

Anterior daughter cell of V6L.papa, fuses into postembryonic large hypodermal syncytium in male.

V6L.pppaa

Anterior daughter cell of V6L.pppa, fuses into postembryonic large hypodermal syncytium in male.

V6R.papaa

Anterior daughter cell of V6R.papa, fuses into postembryonic large hypodermal syncytium in male.

Z1.ppaaaap (5R)

Ventral uterus; cell of pedigree Z1.ppaaaap (5R), a precursor of anterior ut4.

Z1.ppppppp (5L)

Ventral uterus; cell of pedigree Z1.ppppppp (5L), a precursor of anterior ut4.

Z1.paapaap hermaphrodite

Anterior epithelial sheath cell of proximal arms, have muscle fibers, of pedigree Z1.paapaap.

Z1.paapapa hermaphrodite

Anterior epithelial sheath cell of proximal arms, have muscle fibers, of pedigree Z1.paapapa.

Z1.ppaapap (5R)

Ventral uterus; cell of pedigree Z1.ppaapap (5R), a precursor of anterior ut3 syncytium.

BDU

Neuron class of two interneurons with cell bodies situated laterally in the anterior body.

P8.pa

Anterior daughter cell of P8.p, fuses into postembryonic large hypodermal syncytium in hermaphrodite.

Z1.appaaa hermaphrodite

Anterior epithelial sheath cell of proximal arms, have muscle fibers, of pedigree Z1.appaaa.

Z1.appaap hermaphrodite

Anterior epithelial sheath cell of proximal arms, have muscle fibers, of pedigree Z1.appaap.

anterior spermathecal-uterine valve cell 5L

anterior spermathecal-uterine valve cell whose nuclei followed the 5L lineage configuration during development.

P3.pa

Anterior daughter cell of P3.p, fuses into postembryonic large hypodermal syncytium in hermaphrodite.

P4.pa

Anterior daughter cell of P4.p, fuses into postembryonic large hypodermal syncytium in hermaphrodite.

Z1.appapa hermaphrodite

Anterior epithelial sheath cell of proximal arms, have muscle fibers, of pedigree Z1.appapa.

Z1.paapaaa hermaphrodite

Anterior epithelial sheath cell of proximal arms, have muscle fibers, of pedigree Z1.paapaaa.

buccal cavity

cuticle-lined lumenal region surrounded by pharyngeal epithelium, situated at the anterior end of pharynx.

anterior spermathecal-uterine valve cell 5R

anterior spermathecal-uterine valve cell whose nuclei followed the 5R lineage configuration during development.

Z1.appapp hermaphrodite

Anterior epithelial sheath cell of proximal arms, have muscle fibers, of pedigree Z1.appapp.

Z1.paapapp hermaphrodite

Anterior epithelial sheath cell of proximal arms, have muscle fibers, of pedigree Z1.paapapp.

SABVL

Ring interneuron, anteriorly projecting process that runs sublaterally, synapses to anterior body muscles in L1

SABD

Ring interneuron, anteriorly projecting process that runs sublaterally, synapses to anterior body muscles in L1

anterior spermathecal-uterine core cell

A syncytium cell that forms a plug in maturing spemathecal-uterine valve of anterior gonad arm.

SABVR

Ring interneuron, anteriorly projecting process that runs sublaterally, synapses to anterior body muscles in L1

Z1.paaa hermaphrodite

Anterior epithelial sheath cell of hermaphrodite gonad distal arms, no muscle fibers, of pedigree Z1.paaa.

ADE

Neuron class of two sensory neurons of anterior deirids, sensory receptors in lateral alae, contain dopamine.

anterior distal tip cell

Anterior distal tip cell, inhibit meiosis in neighbouring germ cells, lead gonad during morphogenesis, herm gonad

anterior epithelial sheath cell of distal gonad arms

epithelial sheath cell at distal end of the anterior gonad arm, no muscle fibers, of hermaphrodite.

Z1.apa hermaphrodite

Anterior epithelial sheath cell of hermaphrodite gonad distal arms, no muscle fibers, of pedigree Z1.apa.

arc ant V

Embryonic cell of pedigree ABalpapaapa, interface between pharynx and hypodermis, form anterior part of the buccal cavity.

arc post V

Embryonic cell of pedigree ABarapapapa, interface between pharynx and hypodermis, form anterior part of the buccal cavity.

Z4.aappapp (5L)

Ventral uterus; post-embryonic cell of pedigree Z4.aappap[p/v] (5L), a precursor of anterior ut4.

arc ant DR

Embryonic cell of pedigree ABaraaapppa, interface between pharynx and hypodermis, form anterior part of the buccal cavity.

arc post D

Embryonic cell of pedigree ABaraaappaa, interface between pharynx and hypodermis, form anterior part of the buccal cavity.

Z1.ppaappa (5R)

post-embryonic cell of pedigree Z1.ppaapp[a/v] (5R), a precursor of anterior ut2 syncytium.

arc ant DL

Embryonic cell of pedigree ABalpaappaa, interface between pharynx and hypodermis, form anterior part of the buccal cavity.

arc post DR

Embryonic cell of pedigree ABaraaapaaa, interface between pharynx and hypodermis, form anterior part of the buccal cavity.

arc post VL

Embryonic cell of pedigree ABalpaappap, interface between pharynx and hypodermis, form anterior part of the buccal cavity.

arc post VR

Embryonic cell of pedigree ABaraaappap, interface between pharynx and hypodermis, form anterior part of the buccal cavity.

HOB

Neuron class of one male-specific sensory neuron associated with hook sensillum, receptor anterior to cloaca in male.

arc post DL

Embryonic cell of pedigree ABalpaapaaa, interface between pharynx and hypodermis, form anterior part of the buccal cavity.

anterior ganglion (post)

portion of anterior ganglion of somatic nervous system that is near or posteior to the metacorpus of pharynx.

HOA

Neuron class of one male-specific sensory neuron associated with hook sensillum, receptor anterior to cloaca in male.

anterior spermathecal-uterine valve cell

Valve made of a single syncytium cell of four nuclei, connecting spermatheca and uterine of anterior arm of hermaphrodite gonad.

amphid sensillum

Bilaterally symmetric chemosensory specializations located on the two lateral lips in the head involving a large hole in the anterior cuticle.

In.a nucleus

Postembryonic intestinal cell nucleus, the anterior one from nuclear division of any of 10-14 cells in mid-section of intestine.

uterine toroidal epithelial cell

toroidal epithelial cell that make up the bulk of the uterus, four cells anterior and four cells posterior to the vulva.

PHC

Neuron class of two neurons with cell bodies situated in the lumbar ganglia. Posteriorly directed processes run from the cell bodies into the tails pike running alongside the processes of PLM and PLN. The disposition of these processes suggests that they may be sensory dendrites.

vas deferens cuboidal cell region

a region of vas deferens, positioned posterior to the valve and anterior to the elongated cell region, formed by cells of cuboidal morphology.

P3

The third (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

P6

The sixth (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

P7

The seventh (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

P2

The second (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

P4

The fourth (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

P5

The fifth (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

P8

The eighth (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

P1

The first (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

P10

The tenth (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

P9

The ninth (count from anterior-most) of twelve postembryonic blast cells for ventral cord motorneurons, ventral hypodermis, vulva, male preanal ganglion; ventral hypodermis in L1.

pharyngeal-intestinal valve

A group of six equivalent cells forms a tightly constructed 'valve' that links the posterior bulb of the pharynx to the anterior four cells of the intestine. These six cells comprise a small epithelial channel with a cuticular lining in continuity with the pharyngeal cuticle and link the lumen of the pharynx to the large lumen of the anterior intestine.

URY

Neuron class of four neurons with cell bodies situated anterior to the nerve ring. presynaptic in ring, non-ciliated endings in head, associated with OLQ in embryo

hook

A small lump on the gubernaculum of the male tail. This structure lies on the ventral surface just anterior and central to the base of the spicule openings and contains a sensory structure called the hook sensillum.

accessory cell

cells that support sensory neurons, similar to glial cells in vertebrates. A category which collectively refers to socket cells, sheath cells, and structural cells, or their processes. All of these cells extend long processes which serve a supporting role, rather like glia, to form a protective environment around sensory neuron endings. In addition, some of these cells extend broad thin processes from their somata which wrap around neuronal ganglia, again in a glia-like fashion

pharyngeal nerve

A set of three longitudinal nerves (I1L, NSML and M2L) running along the anterior/posterior axis within the pharynx, each lying within a narrow groove created between syncytial pairs of muscles. One nerve lies dorsally, in close apposition to the dorsal gland duct, while the other two nerves lie subventrally.

DD neuron

Neuron class of six motoneurons, with cell bodies in the ventral cord, which innervate dorsal muscles. Each cell has a short, posteriorly directed and a longer, anteriorly directed process emanating from its cell body. The anterior process has a branch, which leaves the ventral cord as a commissure and runs round to the dorsal cord.

intestinal cell

any of 20 large epithelial cells which form a tube and are mostly situated as bilaterally symmetric pairs around the tubular lumen. Each of these cell pairs forms an intestinal ring ( II-IX int rings). The most anterior intestinal ring (int ring I), however, is made of four cells. Intestinal cells contain large nuclei with large nucleoli and numerous autofluorescent granules in their cytoplasm.

ventral ganglion

ganglion lies beside the nerve ring in the head, just anterior of the retrovesicular ganglion. It contains about 20 interneuron and motorneuron cell bodies that all send their neuronal processes into the ring. The cell bodies are divided into two groups by the intrusion of the excretory duct and canal. The cells are bounded by a basal lamina which physically separates them from the lateral ganglion even though they are adjacent to one another.

retrovesicular ganglion

Ganglion that lies at the anterior limit of the ventral nerve cord, near the ventral ganglion and nerve ring in the head posterior to the excretory pore. It is open and continuous with the region containing the motoneurons of the ventral cord. In the early L1 this ganglion holds 12 neuron cell bodies plus one neuroblast (Sulston and Horvitz, 1977; White et al., 1986). In the adult animal, the ganglion holds 20 neuron cell bodies.