Lab 7 Exercise 14: NervousTissue - 1 2 3 4 5 6 Lab7Exercise14 NervousTissue ? a , tissue.Theg

Lab 7 Exercise 14: NervousTissue - 1 2 3 4 5 6...

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Unformatted text preview: 1. 2. 3. 4. 5. 6. Lab 7 Exercise 14 Nervous Tissue What is white matter and gray matter? Describe the difference between the two. a. The brain is composed of two hemispheres within the cerebral cortex and each one contains gray matter and white matter, which are two types of nervous tissue. The gray matter is the darker tissue and this contains mainly neurons, cell bodies, and unmyelinated axons. An unmyelinated axon means that the axon does not have a myelin sheath­­a protein used primarily for insulation. In contrast, white matter contains myelinated axons and nerve fibers. These serve to connect various areas of the brain deep within the cerebral cortex. In response to Question 1, what is a myelin sheath? Does a myelin sheath affect axon impulses? a. A myelin sheath protects and insulates fibers electrically. The electrical insulation also increases the speed of impulses among the nerves. Fibers that have a myelinated sheath often have rapid nerve impulses, compared to those that are unmyelinated which often have slower impulses. Briefly explain the function/location of each neuroglial cell: a. Ependymal​ells​ ​ : are found within the brain and line the ventricle walls c b. Schwann​ells​ ​ : responsible for producing the myelin sheath within the peripheral c nervous system c. Astrocytes​ : aid in creating a blood­brain barrier d. Satellite​ells​ ​ : are responsible for protecting and stabilizing the cell bodies of c neurons within peripheral ganglia e. Oligodendrocytes​ : responsible for producing the myelin sheath within the central nervous system f. Microglia​ : aid in protecting the body, primarily the central nervous system, from disease and harmful toxins List the structures found in the gray matter of a spinal cord cross section. a. Posterior horn b. Lateral horn c. Gray commissure d. Central canal e. Anterior horn List the structures found in the white matter of a spinal cord cross section. a. Posterior (dorsal) white column (posterior funiculus) b. Lateral white column (lateral funiculus) c. Anterior (ventral) white column (anterior funiculus) Briefly give a definition for each structure: a. Axon​ : long process, creates impulses and carries them away from the cell body b. Synaptic​left​ ​ : space created between presynaptic and postsynaptic c membranes c. Epineurium​ : supplies the nerve with blood vessels d. Nissl​odies​ ​ b : composed of ribosomes, responsible for synthesizing proteins e. Synaptic​ ​ terminals​ : signifies the end of a telodendrion, neurotransmitters are released when an impulse is reached f. Perineurium​ : a sheath that provides insulation to an abundance of nerve fibers within a nerve g. Node​ : small gaps that are found within the myelin sheath h. Endoneurium​ : a sheath that supporting individual nerve fibers i. Dendrite​ : impulses are received and sent to the body of the cell j. Arbor​itae​ ​ : also known as the white matter within the cerebral cortex, v resembles a tree with many features of branches ...
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