Question

The following questions are based on sheep brain dissection:

1. Compared to humans, this lobe of the brain is significantly smaller in other animals.  What is the name and the primary function of this lobe?

2. What is located inside of the brain’s ventricles?  Of the three ventricles shown, name the ventricle located underneath the cerebellum.

3. If blunt force trauma caused there to be insufficient communication between the right and left cerebral hemisphere, then what structure most likely sustained the damage?

4. What is the primary function of the thalamus?

5. These three structures are part of the brain: the pons, medulla oblongata, and midbrain.  Starting with the sheep’s spinal cord, list these three structures in the correct order.

6. Which nerve processes the sense of smell, and how is it different in other animals compared to humans?

7. To which part of the brain (forebrain, midbrain, hindbrain) do the pineal body, inferior colliculi, and superior colliculi belong?

Answer 1

Answer 1) Frontal lobe
It control thinking and analysis

Answer 2) Cerebrospinal fluid is present inside the brain's ventricles of the sheep brain.
The fourth ventricle is located underneath the cerebellum.

Answer 3) Left cerebral hemisphere most likely to sustain the damage

Answer 4) It (Thalamus) receives messages from the nerve axons and then transmits them to the appropriate parts of the brain.

Answer 5) Medulla oblongata, pons and midbrain, where medulla is nearest to spinal cord

Answer 6) Cranial nerve 1(olfactory nerve)
The sheep have a more developed sense of smell, or olfaction than humans have.
The olfactory bulb in sheep is two to three times the size of the human olfactory bulb, despite the sheep brain being much smaller overall. This larger olfactory bulb allows the sheep to have a stronger sense of smell which is vital to its survival.

Answer7) pineal body, inferior colliculi, and superior colliculi belong belongs to mid brain.