Question 1

Which muscle is primarily responsible for closing the jaw during mastication?

Accepted Answer

Masseter

Question 2

A patient presents with difficulty flexing their forearm at the elbow. Which muscle is most likely impaired?

Accepted Answer

Biceps brachii

Question 3

Which cranial nerve is responsible for the sense of smell?

Accepted Answer

I. Olfactory

Question 4

Damage to the dorsal root ganglion would most directly affect which function?

Accepted Answer

Sensory input from the periphery

Question 5

Which structure separates the left and right cerebral hemispheres?

Accepted Answer

Longitudinal fissure

Question 6

A lesion in the Broca’s area would most likely result in which clinical symptom?

Accepted Answer

Impaired speech production

Question 7

Which muscle group is responsible for adducting the thigh?

Accepted Answer

Adductor group

Question 8

If the sciatic nerve is damaged, which function is most likely to be affected?

Accepted Answer

Flexion of the leg at the knee

Question 9

Which of the following best describes the function of the myelin sheath?

Accepted Answer

It insulates axons to increase the speed of nerve impulse conduction.

Question 10

A patient cannot abduct their arm at the shoulder. Which muscle is most likely paralyzed?

Accepted Answer

Deltoid

Question 11

Which equation correctly represents the relationship between nerve conduction velocity ($$v$$), axon diameter ($$d$$), and myelination?

Accepted Answer

$$v = k 	imes \sqrt{d}$$

Question 12

Which muscle is responsible for dorsiflexion of the foot?

Accepted Answer

Tibialis anterior

Question 13

Which cranial nerve innervates the lateral rectus muscle of the eye?

Accepted Answer

VI. Abducens

Question 14

A patient has lost sensation in the skin over their deltoid muscle. Which nerve is most likely damaged?

Accepted Answer

Axillary nerve

Question 15

Which part of the brain is primarily responsible for coordination and balance?

Accepted Answer

Cerebellum

Question 16

Which equation best describes the relationship between muscle force ($$F$$), cross-sectional area ($$A$$), and muscle tension ($$T$$)?

Accepted Answer

$$F = T 	imes A$$

Question 17

Which structure contains cerebrospinal fluid and acts as a cushion for the brain?

Accepted Answer

Subarachnoid space

Question 18

A patient presents with wrist drop after a humeral fracture. Which nerve is most likely injured?

Accepted Answer

Radial nerve

Question 19

Which muscle is responsible for compressing the cheeks during blowing or sucking?

Accepted Answer

Buccinator

Question 20

Which cranial nerve is responsible for facial expressions?

Accepted Answer

VII. Facial

Lab Exam 2 Review: Muscles, Nervous System, and Neuroanatomy

Study Guide - Practice Questions