2010 NERVE Complete +lab - NERVOUS TISSUE Erin Furr...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
NERVOUS TISSUE Erin Furr Stimming, MD Reading: Gartner & Hiatt, Chapter 7; Klein and McKenzie, pp131-154 Learning Objectives: Describe the ultrastructure of multipolar neurons and recognize them by light microcospy. Distinguish between the two types of CNS glial cells with light microscopy. List the types of glial cells and their main functions. Describe the process of myelination. Discuss differences in myelinated and unmyelinated fibers in the PNS and CNS. Recognize peripheral nerves and ganglia with light microscopy. Key Words: astrocyte, myelin, oligodendrocyte, Schwann cell, glia, neuron, Nissl substance, axon, microglia, cerebral cortex, white matter and Purkinje cell. I. GENERAL DEFINITIONS A. Central Nervous System (CNS) vs. Peripheral Nervous System (PNS) CNS includes brain and spinal cord; PNS is all outlying nervous tissue (nerve fibers and ganglia). B. Cell Types 1. Neurons (the parenchyma cells) 2. Glial cells (the stromal cells) – supportive and protective function II. EMBRYOLOGIC ORIGIN OF NERVE TISSUE A. Ectoderm  neural plate  neural groove  neural tube  CNS B. Neural Crest 1. Neurons of sensory ganglia 2. Neurons of sympathetic and parasympathetic ganglia 3. Schwann cells 4. Satellite cells 5. Chromaffin cells of adrenal medulla 6. Melanocytes of epidermis 7. Pia mater and arachnoid 8. Odontoblasts III. NEURONS A. Classification of Neurons All neurons have a cell body and a variable number of processes, including at least one axon that transmits impulses away from the cell body, and usually one or more incoming processes called dendrites . Variations on this theme permit classification according to number and types of processes.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Bipolar A single axon and dendrite arise at opposite poles of the cell body. Found as sensory neurons in the ear/vestibular system, in the retina, and in the olfactory mucosa. 2.Pseudounipolar Only one cell process arises from the cell body & then divides into 2 branches. Developmentally, begin as bipolar neurons. Functionally, one process carries impulses to the cell, while the other carries it away. Therefore, although it appears unipolar, developmentally and functionally it is bipolar, giving rise to its name. Found in peripheral sensory ganglia, such as dorsal root ganglia , and in cranial ganglia. 3. Multipolar MOST COMMON One axon, multiple dendrites Found in brain, spinal cord, and peripheral ganglia B. Cell Body 1. Also called the soma or perikaryon and consists of the nucleus and cytoplasm. 2. Nucleus Single large nucleus, usually centrally placed. Moves to periphery if cell is injured. Fine chromatin. Large, prominent nucleolus (“owl-eye” nucleus).
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/25/2010 for the course NEUROBIOLO MSI taught by Professor Rogerj.bick during the Spring '10 term at University of Texas Health Science Center at San Antonio.

Page1 / 10

2010 NERVE Complete +lab - NERVOUS TISSUE Erin Furr...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online