Morphology and central synaptic connections of the efferent neurons innervating the crayfish hindgut

K. Elekes, Ernst Florey, Mary Anne Cahill

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The distribution, morphology and synaptic connections of the hindgut efferent neurons in the last (sixth) abdominal ganglion of the crayfish, Orconectes limosus, have been investigated using light and electron microscopy in conjunction with retrograde cobalt/nickel and HRP labeling through the intestinal nerve. The hindgut efferent neurons occur singly and in clusters, and are unipolar. Their axonal projections are uniform and consist of a thick primary neurite with typical lateral projections and limited arborization of varicose fibers in the ganglionic neuropil. They also send lower order axon processes to the ganglionic neural sheath, where they arborize profusely, forming a network of varicose fibers. The majority of the efferent neurons project to the anterior part of the hindgut. HRP-labeled axon profiles are found in both pre- and postsynaptic position in the neuropil of the ganglion. HRP-labeled axon profiles also establish pre- and postsynaptic contacts in the intestinal nerve root. All hindgut efferent terminals contain similar synaptic vesicle populations: ovoid agranular vesicles (50-60 nm) and a few large granular vesicles (100-200 nm). It is suggested that the hindgut efferent neurons in the last abdominal ganglion are involved in: (1) innervation of the hindgut; (2) central integrative processes; (3) "en route" synaptic modification of efferent and afferent signals in the intestinal nerve; (4) neurohumoral modulation of peripheral physiological processes.

Original languageEnglish
Pages (from-to)369-379
Number of pages11
JournalCell and Tissue Research
Volume254
Issue number2
DOIs
Publication statusPublished - Nov 1988

Fingerprint

Efferent Neurons
Astacoidea
Neurons
Ganglia
Axons
Neuropil
Physiological Phenomena
Fibers
Synaptic Vesicles
Neurites
Cobalt
Nickel
Labeling
Electron microscopy
Optical microscopy
Electron Microscopy
Modulation
Light
Population

Keywords

  • Hindgut efferents
  • HRP labeling
  • Orconectes limosus (Crustacea)
  • Synapses

ASJC Scopus subject areas

  • Anatomy
  • Clinical Biochemistry
  • Cell Biology

Cite this

Morphology and central synaptic connections of the efferent neurons innervating the crayfish hindgut. / Elekes, K.; Florey, Ernst; Cahill, Mary Anne.

In: Cell and Tissue Research, Vol. 254, No. 2, 11.1988, p. 369-379.

Research output: Contribution to journalArticle

@article{dcda3eaa71b244bfb5d708d6a8e09d51,
title = "Morphology and central synaptic connections of the efferent neurons innervating the crayfish hindgut",
abstract = "The distribution, morphology and synaptic connections of the hindgut efferent neurons in the last (sixth) abdominal ganglion of the crayfish, Orconectes limosus, have been investigated using light and electron microscopy in conjunction with retrograde cobalt/nickel and HRP labeling through the intestinal nerve. The hindgut efferent neurons occur singly and in clusters, and are unipolar. Their axonal projections are uniform and consist of a thick primary neurite with typical lateral projections and limited arborization of varicose fibers in the ganglionic neuropil. They also send lower order axon processes to the ganglionic neural sheath, where they arborize profusely, forming a network of varicose fibers. The majority of the efferent neurons project to the anterior part of the hindgut. HRP-labeled axon profiles are found in both pre- and postsynaptic position in the neuropil of the ganglion. HRP-labeled axon profiles also establish pre- and postsynaptic contacts in the intestinal nerve root. All hindgut efferent terminals contain similar synaptic vesicle populations: ovoid agranular vesicles (50-60 nm) and a few large granular vesicles (100-200 nm). It is suggested that the hindgut efferent neurons in the last abdominal ganglion are involved in: (1) innervation of the hindgut; (2) central integrative processes; (3) {"}en route{"} synaptic modification of efferent and afferent signals in the intestinal nerve; (4) neurohumoral modulation of peripheral physiological processes.",
keywords = "Hindgut efferents, HRP labeling, Orconectes limosus (Crustacea), Synapses",
author = "K. Elekes and Ernst Florey and Cahill, {Mary Anne}",
year = "1988",
month = "11",
doi = "10.1007/BF00225809",
language = "English",
volume = "254",
pages = "369--379",
journal = "Cell and Tissue Research",
issn = "0302-766X",
publisher = "Springer Verlag",
number = "2",

}

TY - JOUR

T1 - Morphology and central synaptic connections of the efferent neurons innervating the crayfish hindgut

AU - Elekes, K.

AU - Florey, Ernst

AU - Cahill, Mary Anne

PY - 1988/11

Y1 - 1988/11

N2 - The distribution, morphology and synaptic connections of the hindgut efferent neurons in the last (sixth) abdominal ganglion of the crayfish, Orconectes limosus, have been investigated using light and electron microscopy in conjunction with retrograde cobalt/nickel and HRP labeling through the intestinal nerve. The hindgut efferent neurons occur singly and in clusters, and are unipolar. Their axonal projections are uniform and consist of a thick primary neurite with typical lateral projections and limited arborization of varicose fibers in the ganglionic neuropil. They also send lower order axon processes to the ganglionic neural sheath, where they arborize profusely, forming a network of varicose fibers. The majority of the efferent neurons project to the anterior part of the hindgut. HRP-labeled axon profiles are found in both pre- and postsynaptic position in the neuropil of the ganglion. HRP-labeled axon profiles also establish pre- and postsynaptic contacts in the intestinal nerve root. All hindgut efferent terminals contain similar synaptic vesicle populations: ovoid agranular vesicles (50-60 nm) and a few large granular vesicles (100-200 nm). It is suggested that the hindgut efferent neurons in the last abdominal ganglion are involved in: (1) innervation of the hindgut; (2) central integrative processes; (3) "en route" synaptic modification of efferent and afferent signals in the intestinal nerve; (4) neurohumoral modulation of peripheral physiological processes.

AB - The distribution, morphology and synaptic connections of the hindgut efferent neurons in the last (sixth) abdominal ganglion of the crayfish, Orconectes limosus, have been investigated using light and electron microscopy in conjunction with retrograde cobalt/nickel and HRP labeling through the intestinal nerve. The hindgut efferent neurons occur singly and in clusters, and are unipolar. Their axonal projections are uniform and consist of a thick primary neurite with typical lateral projections and limited arborization of varicose fibers in the ganglionic neuropil. They also send lower order axon processes to the ganglionic neural sheath, where they arborize profusely, forming a network of varicose fibers. The majority of the efferent neurons project to the anterior part of the hindgut. HRP-labeled axon profiles are found in both pre- and postsynaptic position in the neuropil of the ganglion. HRP-labeled axon profiles also establish pre- and postsynaptic contacts in the intestinal nerve root. All hindgut efferent terminals contain similar synaptic vesicle populations: ovoid agranular vesicles (50-60 nm) and a few large granular vesicles (100-200 nm). It is suggested that the hindgut efferent neurons in the last abdominal ganglion are involved in: (1) innervation of the hindgut; (2) central integrative processes; (3) "en route" synaptic modification of efferent and afferent signals in the intestinal nerve; (4) neurohumoral modulation of peripheral physiological processes.

KW - Hindgut efferents

KW - HRP labeling

KW - Orconectes limosus (Crustacea)

KW - Synapses

UR - http://www.scopus.com/inward/record.url?scp=0007657432&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0007657432&partnerID=8YFLogxK

U2 - 10.1007/BF00225809

DO - 10.1007/BF00225809

M3 - Article

AN - SCOPUS:0007657432

VL - 254

SP - 369

EP - 379

JO - Cell and Tissue Research

JF - Cell and Tissue Research

SN - 0302-766X

IS - 2

ER -