Question 1

Which structure connects the two cerebral hemispheres and is responsible for communication between them?

Accepted Answer

Corpus callosum

Question 2

A patient presents with loss of sensation in the lateral forearm and weakness in elbow flexion. Which nerve is most likely affected?

Accepted Answer

Musculocutaneous nerve

Question 3

Which cranial foramen does the optic nerve pass through?

Accepted Answer

Optic foramen

Question 4

The brachial plexus roots are formed by the anterior rami of which spinal nerves?

Accepted Answer

C5, C6, C7, C8, T1

Question 5

Which muscle is primarily innervated by the axillary nerve?

Accepted Answer

Deltoid

Question 6

A herniated disc in the lumbar region can compress which structure, leading to symptoms in the lower limbs?

Accepted Answer

Cauda equina

Question 7

Which of the following best describes the correct order of the brachial plexus organization from proximal to distal?

Accepted Answer

Roots \u003e Trunks \u003e Divisions \u003e Cords \u003e Branches

Question 8

Which ventricle is located between the thalamus and hypothalamus?

Accepted Answer

Third ventricle

Question 9

A patient has difficulty abducting their arm at the shoulder. Which nerve and cord of the brachial plexus are most likely involved?

Accepted Answer

Axillary nerve, posterior cord

Question 10

Which structure is responsible for relaying sensory information to the cerebral cortex?

Accepted Answer

Thalamus

Question 11

If the median nerve is damaged at the level of the elbow, which muscle function would most likely be impaired?

Accepted Answer

Flexor digitorum superficialis

Question 12

Which of the following equations correctly represents the relationship between the number of spinal nerves and vertebrae in the cervical region?

Accepted Answer

$$N_{spinal} = N_{vertebrae} + 1$$

Question 13

During a spinal reflex arc from the foot, which is the correct sequence of structures involved?

Accepted Answer

Sensory receptor \u003e Sensory neuron \u003e Dorsal root ganglion \u003e Interneuron \u003e Motor neuron \u003e Effector

Question 14

Which structure is NOT part of the diencephalon?

Accepted Answer

Midbrain

Question 15

A lesion in the superior trunk of the brachial plexus would most likely affect which nerve?

Accepted Answer

Suprascapular nerve

Question 16

Which equation best describes Ohm's Law as applied to nerve conduction velocity ($$v$$), where $$I is $$current and $$R is $$resistance?

Accepted Answer

$$v = \frac{I}{R}$$

Question 17

Which of the following is a function of the cerebellum?

Accepted Answer

Coordination of voluntary movements

Question 18

A patient with spinal cord injury at the level of C7 would most likely lose function in which nerve root?

Accepted Answer

C7 root

Question 19

Which meningeal layer is closest to the brain tissue?

Accepted Answer

Pia mater

Question 20

Which cord of the brachial plexus gives rise to the musculocutaneous nerve?

Accepted Answer

Lateral cord

Central Nervous System Structures and the Brachial Plexus: Study Guide

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