Lab 8 Exercise 15: The Brain and Cranial Nerves - Lab8Exercise15 1 a Duramater:, b Subduralspace: c Arachnoidmater:drain

Lab 8 Exercise 15: The Brain and Cranial Nerves -...

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Unformatted text preview: Lab 8 Exercise 15 The Brain and Cranial Nerves 1. List and define the meningeal layers from outermost to deepest layer. a. Dura mater: functions to support sinuses, enhance proper blood flow to the heart b. Subdural space: blood can be leaked into this space if damaged c. Arachnoid mater: drains cerebrospinal fluid d. Subarachnoid space: filled with cerebrospinal fluid e. Pia mater: innermost layer 2. If tissue damage occurred in these structures, how would it affect the brain function? a. Basal nuclei: These are regions found within the gray matter of the brain. Basal nuclei function to regulate one’s voluntary movements. If tissue damage occurred in this part of the brain, a person would slowly lose the ability to have any control over their movements and muscles. This can lead to tremors and uncontrollable shaking. b. Inferior colliculi: This structure is part of the midbrain and is known to aid in discriminating sounds and their pitch. It also acts as a filter and allows a person to filter out the different sounds created by chewing and breathing. If this was damaged, a person might not be able to filter sounds out properly. Chewing might appear to be a lot louder than normal and ultimately painful. A person might not be able to recognize or distinguish one sound from another, and a person’s reaction time to certain situations can be a lot slower. c. Food intake center in hypothalamus The lateral hypothalamus is responsible for giving a person the desire to eat and creates the feeling of hunger. Damage to this area can cause an individual to not feel hungry and not desire food, when in reality their body is starving for nutrients. This can ultimately lead to health problems if an individual doesn’t have the urge to eat. 3. Briefly define the functions of the following brain structures: a. Cerebrum: responsible for controlling voluntary movements, storing memories, developing thoughts b. Corpus callosum: made up of myelinated nerves, responsible for connecting the cerebral hemispheres c. Fornix: functions to connect the hippocampus and mammillary body together d. Hypothalamus: responsible for regulating the autonomic nervous system, controls temperature, and regulates the amount of food intake e. Pons: regulates breathing f. Medulla oblongata: regulates heart rate and breathing 4. What are the structures that allow for the flow of cerebrospinal fluid? a. Third ventricle b. Interventricular foramen c. Fourth Ventricle d. Lateral ventricle e. Central canal f. Aqueduct of the midbrain ...
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