Deck 33: Dissection of the Sheep Brain

Question 1

The brains of mammals have many common structural features.

Answer 1

True

Question 2

Even though the human brain is larger than the sheep brain, the sheep brain has more gyri and sulci than the human brain.

Answer 2

False

Question 3

Which ventricles are separated by the septum pellucidum?

A) The lateral ventricles and the third ventricle
B) The 2 medial ventricles
C) The third ventricle and the fourth ventricle
D) The fourth ventricle and the fifth ventricle
E) The 2 lateral ventricles

Answer 3

E

Question 4

Which portion of the brainstem continues directly into the spinal cord?

A) Medulla oblongata
B) Cerebral peduncle
C) Midbrain
D) Corpora quadrigemina
E) Pons

Question 5

What is the function of the choroid plexuses?

A) They form a bridge between the cerebral hemispheres.
B) They are responsible for visual reflexes.
C) They are small nerve plexuses in the brain.
D) They produce cerebrospinal fluid.
E) They are responsible for auditory reflexes.

Question 6

Which of the following structures separates the 2 cerebral hemispheres of the sheep brain?

A) Central sulcus
B) Coronal fissure
C) Lateral sulcus
D) Longitudinal fissure
E) Transverse fissure

Question 7

Which layer of the meninges is thick and opaque?

A) Arachnoid mater
B) Infundibulum
C) Dura mater
D) Mammillary body
E) Pia mater

Question 8

In a median section of a sheep brain, the thalamus lies ________ the midbrain.

A) superior
B) lateral
C) anterior
D) inferior
E) posterior

Question 9

The corpus callosum is a transverse band of white matter that runs between the cerebral hemispheres.

Question 10

When comparing relative sizes, human olfactory bulbs are larger than those of sheep.

Question 11

On a median section of a sheep brain, the hypothalamus lies ________ to the thalamus.

A) superior
B) posterior
C) inferior
D) lateral
E) anterior

Question 12

The corpora quadrigemina, cerebral peduncles, and cerebral aqueduct are all parts of the

A) midbrain.
B) diencephalon.
C) medulla oblongata.
D) thalamus.
E) pons.

Question 13

When looking at a ventral view of the sheep brain, which of the cranial nerves can be seen emerging from the floor of the midbrain?

A) Trigeminal nerves
B) Oculomotor nerves
C) Facial nerves
D) Olfactory nerves
E) Vagus nerves

Question 14

The optic nerves extend posteriorly and medially from the eyes, and merge at the

A) optic chiasma.
B) infundibulum.
C) corpus callosum.
D) fornix.
E) cerebral peduncle.

Question 15

When looking at the ventral surface of the sheep brain, which of the following structures is the most anterior?

A) Oculomotor nerves
B) Optic chiasma
C) Mammillary body
D) Facial nerves
E) Olfactory bulbs