Question 1

Which muscle is primarily responsible for elevating the eyebrows and wrinkling the forehead, and what is its anatomical location?

Accepted Answer

Frontal belly of the epicranius; forehead region

Question 2

A patient is unable to close their eyelids tightly. Which muscle is most likely impaired?

Accepted Answer

Orbicularis oculi

Question 3

Which muscle acts as the prime mover for flexion of the forearm at the elbow joint?

Accepted Answer

Brachialis

Question 4

During chewing, which muscle is primarily responsible for elevating the mandible?

Accepted Answer

Masseter

Question 5

If a person has difficulty abducting their arm at the shoulder, which muscle is most likely weakened?

Accepted Answer

Deltoid

Question 6

Which muscle is the antagonist to the biceps brachii during elbow flexion?

Accepted Answer

Triceps brachii

Question 7

A soccer player suffers a strain to the muscle that extends the knee. Which muscle group is most likely affected?

Accepted Answer

Quadriceps femoris

Question 8

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

Accepted Answer

Buccinator

Question 9

A patient presents with difficulty in dorsiflexing the foot. Which muscle is most likely compromised?

Accepted Answer

Tibialis anterior

Question 10

Which muscle is the prime mover for extension of the forearm at the elbow?

Accepted Answer

Triceps brachii

Question 11

Which muscle group is primarily responsible for flexing the thigh at the hip joint?

Accepted Answer

Iliopsoas

Question 12

A patient is unable to pucker their lips. Which muscle is most likely affected?

Accepted Answer

Orbicularis oris

Question 13

Which muscle is the main antagonist to the rectus femoris during knee extension?

Accepted Answer

Biceps femoris

Question 14

Which muscle is primarily responsible for lateral rotation of the arm at the shoulder?

Accepted Answer

Infraspinatus

Question 15

A patient has difficulty flexing their fingers. Which muscle is most likely impaired?

Accepted Answer

Flexor digitorum profundus

Question 16

Which muscle is the prime mover for plantar flexion of the foot?

Accepted Answer

Gastrocnemius

Question 17

During forced expiration, which muscle contracts to decrease the volume of the thoracic cavity?

Accepted Answer

Internal intercostals

Question 18

Which muscle is responsible for flexing and rotating the vertebral column?

Accepted Answer

Rectus abdominis

Question 19

A patient is unable to abduct their fingers. Which muscle is most likely affected?

Accepted Answer

Dorsal interossei

Question 20

Which muscle is the prime mover for extension of the thigh at the hip joint during climbing stairs?

Accepted Answer

Gluteus maximus

Major Muscles of the Human Body: Locations and Movements

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