Nervous System Lab

Nervous System Lab - Biology 304 Histology Laboratory Dr....

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Biology 304 Histology Laboratory Dr. S. M. Robichaux Slides needed: 2f, 30, 63, 71-c, 71-g, 71-m, 72-a, 72-m, 72-t, 74-b, 74-g, 81-a, 86-p, 92-b, 92-c or 92-d, 148 General Histology Nervous Tissue A. Nervous Tissue: This tissue is composed of neurons (nerve cells), which have numerous protoplasmic extensions (axons and dendrites) and is supported by special connective tissue cells (neuroglia). Neurons are grouped as circuits to provide rapid communication between groups of serially disposed cells. This permits rapid transmission of information over long distances. The functions of nervous tissue are to receive stimuli, transform the stimuli into nervous excitations, transmit and evoke appropriate responses. 1. Organization of nervous tissue: a . Central Nervous System (CNS) : brain, brain stem and spinal cord b. Peripheral Nervous System (PNS) : spinal nerves and ganglion, cranial nerves and ganglion. c. Neurons : the anatomical and physiological unit of nervous tissue and consists of the cell body and its fibers. (1) Neuronal classifications: page 321 in text aa. Bipolar : a neuron with a single axon and a single dendrite opposite a spindle shaped cell body; associated with the receptors for the special senses (taste, smell, hearing, sight and equilibrium); located in the retina of the eye, olfactory epithelium of the nasal cavity and cochlea of the inner ear. bb. Pseudounipolar : a single process arises from the neural cell body; this process bifurates to form one branch that functions as the axon and the other to function as the dendrite; located in craniospinal ganglia; sensory. c c . Multipolar : neurons which contain a single axon and numerous dendrites; include the motor neurons and interneurons. dd. Sensory neurons : receive sensory stimuli from receptors to the central nervous system. e e . Motor neurons : convey impulses from the CNS or from ganglia to effector cells (muscles and glands) f f . Interneurons : form a communicating and integrating network between the sensory and motor neurons. gg. Golgi type I neurons : cells having a well-developed dendritic tree and a long axon; includes the pyramidal and Purkinje cells. hh. Golge type II neurons : cells having many short dendrites and one short axon; includes interneurons. 1
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2. Neurons a. Neuron anatomy: motor nerve smear slide-#72-a, spinal cord with ganglion slide-#74-g, sympathetic ganglion slide-#74-b; page 320/323 of text; figure 8-2/8-9/8-10/8-11/8-12/ 8-14 of atlas (1) Perikaryon (cell body): Spherical, ovoid or angular shaped; range in size from 5 – 150 micrometers. Outline depends on the number of processes and the number of synapses. 1 . Nucleus : large, euchromatic, spherical and centrally located; contains a deep staining nucleolus . 2. Organelles:
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This note was uploaded on 04/21/2008 for the course BIOL 101 taught by Professor Kilgen during the Spring '08 term at Nicholls State.

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Nervous System Lab - Biology 304 Histology Laboratory Dr....

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