External Features of the Brain

Question 1

Ramón y Cajal asks: “What vessel(s) serve(s) the primary somatosensory cortex?”
A. Anterior cerebral artery.
B. Middle cerebral artery.
C. Both.
D. Neither.

Answer 1

Both.

Question 2

What vessel supplies this gyrus?
A. Anterior cerebral artery.
B. Middle cerebral artery.
C. Posterior cerebral artery.

Answer 2

Anterior cerebral artery

Question 3

Sudden occlusion of which artery, near its origin, will produce the most devastating effects?
A. The anterior cerebral artery.
B. The middle cerebral artery of the dominant hemisphere.
C. The middle cerebral artery of the nondominant hemisphere.
D. The posterior cerebral artery of the dominant hemisphere.
E. The posterior cerebral artery of the nondominant hemisphere.

Answer 3

The middle cerebral artery of the dominant hemisphere.

Question 4

What vessel(s) serve(s) areas involved in speech in the majority of people?
A. Right middle cerebral artery.
B. Left middle cerebral artery.
C. Right and left middle cerebral arteries.
D. Right and left posterior cerebral arteries.
E. Left middle and posterior cerebral arteries.

Answer 4

Left middle cerebral artery.

Question 5

What vessel supplies the primary auditory cortex (arrow)?
A. Anterior cerebral artery.
B. Middle cerebral artery.
C. Posterior cerebral artery.

Answer 5

Middle cerebral artery.

Question 6

What vessel(s) serve(s) the primary motor cortex?
A. Anterior cerebral artery.
B. Middle cerebral artery.
C. Both.
D. Neither.

Answer 6

Both

Question 7

If the cerebral artery (indicated by arrows) were occluded, the result would be:
A. Loss of speech comprehension (receptive aphasia).
B. Difficulty in speech production (motor aphasia).
C. Partial loss of vision.
D. Loss of motor control for the upper body.

Answer 7

Partial loss of vision

Question 8

Branches of what vessel vascularize this area of cortex?
A. Anterior cerebral artery.
B. Middle cerebral artery.
C. Posterior cerebral artery.

Answer 8

Posterior cerebral artery

Question 9

A general principle of cortical organization is that sensory information and motor control for each half of the body are on the opposite side of the brain. Occlusion of the right middle cerebral artery, as occurred here, will likely result in:
A. Decreased sensation on the left arm and hand.
B. Decreased motor control of the left arm and hand.
C. Decreased speech comprehension (receptive aphasia).
D. A and B.
E. A, B and C.

Answer 9

A and B.

Question 10

Unilateral Cerebral strokes can cause deficits in motor control, somatic sensation and vision. However, they do not cause deficits in hearing. The explanation for this is:
A. Auditory information does not reach the cortex
B. Auditory information only goes to one hemisphere.
C. Auditory information goes to both hemispheres

Answer 10

Auditory information goes to both hemispheres

Question 11

Obstruction of the cerebral aqueduct would result in dilation of which of the following?
A. Lateral ventricles
B. Third ventricle
C. Fourth ventricle
D. A and B
E. A, B, and C

Answer 11

A and B

Question 12

Which of the following structures does not border on the third ventricle?
A. Thalamus
B. Hypothalamus
C. Fourth ventricle
D. Interventricular foramen
E. Aqueduct

Answer 12

Fourth ventricle