Question 1

Which muscle is primarily responsible for initiating the abduction of the arm at the shoulder joint?

Accepted Answer

Supraspinatus

Question 2

A patient presents with difficulty flexing their forearm at the elbow and has lost the ability to supinate the forearm. Which muscle is most likely injured?

Accepted Answer

Biceps brachii

Question 3

Which muscle acts as the prime mover of inspiration by increasing the volume of the thoracic cavity?

Accepted Answer

Diaphragm

Question 4

During a boxing match, a fighter receives a blow to the side of the face, resulting in difficulty closing the jaw. Which muscle is most likely affected?

Accepted Answer

Masseter

Question 5

Which muscle is responsible for plantar flexion of the foot and originates from the condyles of the femur?

Accepted Answer

Gastrocnemius

Question 6

A patient is unable to retract and elevate the corners of their mouth, resulting in a flat facial expression. Which muscle is most likely paralyzed?

Accepted Answer

Zygomaticus major

Question 7

Which muscle is the prime mover of arm flexion and inserts on the greater tubercle of the humerus?

Accepted Answer

Pectoralis major

Question 8

If the sternocleidomastoid muscle on the right side contracts alone, what is the resulting movement?

Accepted Answer

The face turns to the left

Question 9

Which muscle compresses the abdominal wall and has its origin at the linea alba and pubic crest?

Accepted Answer

Transverse abdominis

Question 10

A patient is unable to dorsiflex their foot after a sports injury. Which muscle is most likely damaged?

Accepted Answer

Tibialis anterior

Question 11

Which muscle is responsible for the prime movement of finger extension and originates from the lateral epicondyle of the humerus?

Accepted Answer

Extensor digitorum

Question 12

Which muscle is involved in both flexion and abduction of the thigh and is known as the 'tailor's muscle'?

Accepted Answer

Sartorius

Question 13

A patient cannot elevate their upper lip after a facial injury. Which muscle is most likely affected?

Accepted Answer

Levator labii superioris

Question 14

Which muscle is the prime mover of arm extension and inserts into the intertubercular sulcus of the humerus?

Accepted Answer

Latissimus dorsi

Question 15

Which muscle is responsible for closing the eyes and has its origin at the orbit?

Accepted Answer

Orbicularis oculi

Question 16

A patient is unable to depress their mandible after a neck injury. Which muscle is most likely affected?

Accepted Answer

Digastric

Question 17

Which muscle is responsible for medially rotating the arm and inserts on the lesser tubercle of the humerus?

Accepted Answer

Subscapularis

Question 18

Which muscle is responsible for flexing and rotating the lumbar region of the vertebral column and inserts on the xiphoid process of the sternum?

Accepted Answer

Rectus abdominis

Question 19

A patient is unable to extend their leg at the knee joint. Which muscle group is most likely affected?

Accepted Answer

Quadriceps femoris

Question 20

Which muscle is responsible for protracting and rotating the scapula downward and originates from ribs 3-5?

Accepted Answer

Pectoralis minor

Muscles of the Human Body: Origins, Insertions, and Actions

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