Question 1

Which muscle is primarily responsible for flexion of the head, as when bringing the chin toward the chest?

Accepted Answer

Sternocleidomastoid

Question 2

A patient presents with an inability to smile on one side of their face. Which cranial nerve is most likely affected?

Accepted Answer

Cranial nerve VII (Facial nerve)

Question 3

Which muscle is the prime mover for jaw closure during mastication?

Accepted Answer

Masseter

Question 4

During heavy breathing, which muscle aids in forced expiration by depressing the rib cage?

Accepted Answer

Internal intercostal muscles

Question 5

Which muscle forms the central tendon and is the most important muscle of respiration?

Accepted Answer

Diaphragm

Question 6

A patient has difficulty compressing their cheeks while chewing, causing food to accumulate between the cheek and teeth. Which muscle is most likely weakened?

Accepted Answer

Buccinator

Question 7

Which group of muscles is primarily responsible for maintaining the normal curvatures of the spine and trunk extension?

Accepted Answer

Erector spinae group

Question 8

Which muscle is responsible for the action of raising the eyebrows and wrinkling the forehead?

Accepted Answer

Frontal belly of epicranius

Question 9

Which muscle is a prime mover for arm abduction at the shoulder joint?

Accepted Answer

Deltoid

Question 10

A patient is unable to laterally flex or rotate their head to one side. Which muscle is most likely impaired?

Accepted Answer

Splenius capitis

Question 11

Which muscle is responsible for the 'pouting' action of the lower lip?

Accepted Answer

Mentalis

Question 12

Which muscle is most active during forced inspiration, such as during vigorous exercise?

Accepted Answer

External intercostal muscles

Question 13

Which muscle is responsible for compressing the abdomen and flexing the vertebral column, as in doing a sit-up?

Accepted Answer

Rectus abdominis

Question 14

Which muscle is responsible for the 'smiling' action by elevating the corners of the mouth?

Accepted Answer

Zygomaticus major

Question 15

Which muscle is primarily responsible for depressing the mandible and opening the mouth?

Accepted Answer

Digastric

Question 16

Which muscle is most involved in the action of puckering the lips, as in whistling?

Accepted Answer

Orbicularis oris

Question 17

Which muscle is responsible for elevating the scapula, as in shrugging the shoulders?

Accepted Answer

Levator scapulae

Question 18

Which muscle is most responsible for the lateral movement of the jaw during chewing?

Accepted Answer

Lateral pterygoid

Question 19

Which muscle is a key player in forced expiration, such as when blowing out a candle?

Accepted Answer

Internal intercostal muscles

Question 20

Which muscle is responsible for tensing the neck skin, as in expressions of stress or fright?

Accepted Answer

Platysma

Muscles of the Body: Head, Neck, and Trunk

Study Guide - Practice Questions

Study Guide - Flashcards