Abstract

The gross structure and the neural arrangements in the optic lamina of crab Hemigrapsus nudus have been studied by light microscopy Golgi techniques and by electron microscopy. The lamina from distal to proximal is composed of a distinct cell layer, a fibular synaptic region, the plexiform layer, a spares cell layer, and the first optic chiasma. Golgi preparation of the lamina reveal four types of cells contributing to the lamina synaptic layer. Retinula cell axons and terminations, monopolar neurons with perikarya in the distal cell layer, tangential cells, neurons whose primary process enters from the chiasma with secondary processes branching in a horizontal direction and horizontal to the columnar or cartridge arrangement of the lamina. The majority of the retinular fibers terminate in the plexiform layer. One receptor terminates in the medulla externa, Monopolar neurons are categorized into five types, M 1-5, based on their arborization pattern and location, Golgi impregnation shows 3 types of tangential cells, evenly spaced throughout the plexiform layers with arborization diameter sufficient to provide overlap. Electromicroscopic data shows the cartridge structures to be rectangular in shape with receptor terminals rigidly regimented in the distal plexiform layer (DPL) and more loosely organized in the proximal plexiform layer (PPL).

LLU Discipline

Physiology

Department

Physiology

School

Graduate School

First Advisor

Donald D. Rafuse

Second Advisor

Robert L. Shultz

Third Advisor

T. Joe Willey

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1981

Date (Title Page)

9-1981

Language

English

Library of Congress/MESH Subject Headings

Crabs; Optic Lobe.

Type

Thesis

Page Count

v; 30

Digital Format

PDF

Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Collection

Loma Linda University Electronic Theses and Dissertations

Collection Website

http://scholarsrepository.llu.edu/etd/

Repository

Loma Linda University. Del E. Webb Memorial Library. University Archives

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