Lab 3 Answer Sheet
HITP 112Fa 13Lab 3 Answer SheetQuestion 1What does the darker, “H” shaped matter consist of?         Gray matter which consists of unmyelinated fibers, cell bodies, and dendrites. It has the two upper “arms” called posterior horns, the two lower “legs” called anterior horns, a small projection of gray matter called the lateral horn, and gray commissure which connects the right and left sides of H together. There is also a small hole in its center called the central canal. What does the lighter surrounding matter consist of?        White matter composed mostly of myelinated fibers. It is divided into anterior, posterior, and lateral columns.What do you suppose the light brown matter surrounding the spinal cord is? The three membranes of the CNS: dura matter, pia mater, and arachnoid. What color is the vertebral body? Pink or whiteQuestion 2: What is the bright, light colored structure?  Intervertebral discQuestion 3: You will note that the spinal cord is wider in the cervical and lumbar regions; why is this? Because of the abundance of spinal nerves serving the appendages. The cervical enlargement contains nerves that supply the upper appendages and those of the lumbar enlargement supply the lower appendages. Question 4: Spinal nerves descend from the conus medullaris at the end of the spinal cord. What are these spinal nerves as a group called? At what spinal level does this structure begin? Cauda equina. Lumbar vertebral levels L1 and L2.Question 5: What is this layer of brain meninges called? What are the two other layers of brain covering below this layer called? Dura matter.  Arachnoid and pia matter.Question 6: What is one major function of each lobe of the brain? Frontal lobe: controls voluntary movement/activity. Parietal lobe: processes information about temperature, taste, touch and movement. Occipital lobe: responsible for vision. Temporal lobe: processes memories, integrating them with sensations of taste, sound, sight and touch.

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