Question

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1. Where are the choroid plexuses found, and what is their function?

2. Describe the folding of the cerebrum in a sheep brain compared to a human brain. Why are the folds important?

3. The cerebellum of the human is divided into two portions, while the sheep only has one portion of the cerebellum. Why is there a difference?

4. How is the brain stem different in the sheep brain than in the human brain?

5. What is the difference between the dorsal and ventral roots of the spinal nerves?

Answer 1

1.The choroid plexus is located in the ventricular system. This series of connecting hollow spaces circulates cerebrospinal fluid. Choroid plexus structures are found within both lateral ventricles as well as the third and fourth ventricles of the brain.

The two important functions of the choroid plexus are to aid in brain development and protection. This is accomplished through cerebrospinal fluid production and brain protection via the blood-cerebrospinal fluid barrier.

2.The folds are important because it means more surface area. The more folds means the more neurons the brain holds. The human brain has more folds than a sheep brain. The human brainis rounded, larger and heavier than the sheep brain. The human brain also makes us capable of thinking, writing, inventing and creating whereas the sheep brain cannot.

3.The human cerebellum controls human behavior and motor control, which is why it is divided into two portions and the sheep only has one. The sheep’s behavior and motor control are less complex than the human’s.

4.The brain stem in the human is towards the backbone and downwards compared to the sheep’s backbone which is horizontal and its brain is directed outwards.

5.The difference between the dorsal and ventral roots of the spinal nerves are the sensory nerve fibers enter the spinal cord through the dorsal root while the motor nerves exit through the ventral root. sensory neurons enter through the dorsal root into the gray matter of the spinal cord.