Question 1

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

Accepted Answer

Deltoid

Question 2

A patient presents with difficulty initiating abduction of the arm but can complete the movement with assistance. Which muscle is most likely injured?

Accepted Answer

Supraspinatus

Question 3

Which of the following muscles inserts on the lesser tubercle of the humerus?

Accepted Answer

Subscapularis

Question 4

The primary action of the latissimus dorsi is best described as:

Accepted Answer

Prime mover of arm extension

Question 5

Which muscle is responsible for the lateral rotation of the arm and is part of the rotator cuff?

Accepted Answer

Infraspinatus

Question 6

A baseball pitcher suffers a tear at the muscle originating from the lateral border of the dorsal scapular surface and inserting on the greater tubercle of the humerus. Which muscle is injured?

Accepted Answer

Teres minor

Question 7

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

Accepted Answer

Triceps brachii

Question 8

The biceps brachii is responsible for which of the following actions?

Accepted Answer

Flexes and supinates forearm

Question 9

Which muscle group originates primarily from the medial epicondyle of the humerus?

Accepted Answer

Forearm flexors

Question 10

Where do three of the four rotator cuff muscles insert?

Accepted Answer

Greater tubercle of humerus

Question 11

Which muscle is the 'odd one out' regarding the insertion site among the rotator cuff muscles?

Accepted Answer

Subscapularis

Question 12

A patient is unable to flex their thigh at the hip joint and also has difficulty with lateral flexion of the vertebral column. Which muscle group is most likely affected?

Accepted Answer

Iliopsoas

Question 13

Which muscle acts to flex, abduct, and laterally rotate the thigh, as well as flex the leg?

Accepted Answer

Sartorius

Question 14

The quadriceps femoris group shares a common insertion at which anatomical landmark?

Accepted Answer

Tibial tuberosity and patella

Question 15

Which muscle is the primary extensor of the thigh and is especially active during actions like climbing stairs or rising from a seated position?

Accepted Answer

Gluteus maximus

Question 16

Where do the hamstring muscles originate?

Accepted Answer

Ischial tuberosity

Question 17

Which muscle is the prime mover of dorsiflexion at the ankle joint?

Accepted Answer

Tibialis anterior

Question 18

Both the gastrocnemius and soleus insert on which structure via the calcaneal tendon?

Accepted Answer

Calcaneus

Question 19

A patient with a torn subscapularis muscle would have the most difficulty with which movement?

Accepted Answer

Medial rotation of the arm

Question 20

Which muscle group is responsible for extending the leg at the knee joint?

Accepted Answer

Quadriceps femoris

Muscles Crossing Major Joints: Origins, Insertions, and Actions

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