Question 1

Which of the following muscles functions in lateral rotation of the humerus?

Accepted Answer

The teres minor muscle is responsible for lateral rotation of the humerus. It is one of the rotator cuff muscles that stabilize the shoulder joint.

Question 2

The insertion of the biceps brachii muscle is on which structure?

Accepted Answer

The biceps brachii muscle inserts on the tuberosity of the radius, allowing it to flex the forearm at the elbow and supinate the forearm.

Question 3

All these arteries supply the breast EXCEPT:

Accepted Answer

The subscapular artery primarily supplies the scapular area and does not directly supply the breast. The other arteries listed (intercostal, lateral thoracic, internal thoracic, and thoracoacromial arteries) all contribute to the blood supply of the breast.

Question 4

The coracoclavicular ligament resists which movement of the scapula?

Accepted Answer

The coracoclavicular ligament resists upward movement of the scapula.

Question 5

Which of the following muscles is NOT attached to either the greater tubercle or lesser tubercle of the humerus?

Accepted Answer

Teres major attaches to the medial lip of the intertubercular sulcus of the humerus, not to the greater or lesser tubercle. The other muscles listed (subscapularis, supraspinatus, teres minor, and infraspinatus) are all part of the rotator cuff and attach to the greater or lesser tubercle of the humerus.

Question 6

In the cubital fossa the tendon of the biceps brachii muscle lies where in relationship to the brachial artery?

Accepted Answer

The tendon of the biceps brachii muscle is lateral to the brachial artery in the cubital fossa.

Question 7

Which of the following is NOT classified as part of the rotator cuff?

Accepted Answer

The deltoid muscle is not part of the rotator cuff. The rotator cuff consists of four muscles: infraspinatus, subscapularis, supraspinatus, and teres minor, which are responsible for stabilizing the shoulder joint.

Question 8

Compression of the median nerve in the carpal tunnel would cause paralysis of all of the following muscles EXCEPT:

Accepted Answer

The median nerve innervates the opponens pollicis, abductor pollicis brevis, flexor pollicis brevis, and the first and second lumbricals, but not the adductor pollicis, which is innervated by the ulnar nerve.

Question 9

The carpal tunnel, along with the vertical groove, contains all the following tendons EXCEPT:

Accepted Answer

The tendon of flexor carpi ulnaris does not pass through the carpal tunnel; it is located outside the tunnel.

Question 10

The flexor digitorum superficialis functions in:

Accepted Answer

The flexor digitorum superficialis is primarily responsible for flexing the middle phalanges of the fingers. It also assists in flexing the wrist, making option A correct.

Question 11

Which of the following muscles is attached to the coracoid process?

Accepted Answer

The pectoralis minor muscle attaches to the coracoid process of the scapula.

Question 12

Which of these muscles is innervated by the suprascapular nerve?

Accepted Answer

The suprascapular nerve innervates the supraspinatus and infraspinatus muscles, which are both located in the posterior aspect of the scapula.

Question 13

Muscles that flex the forearm at the elbow include:

Accepted Answer

The brachioradialis, pronator teres, and brachialis are all muscles that contribute to the flexion of the forearm at the elbow. The brachioradialis is a primary muscle involved in forearm flexion, especially when the forearm is in a mid-position between pronation and supination. The brachialis is a major flexor of the forearm at the elbow, working alongside the biceps brachii. The pronator teres, while primarily involved in pronation of the forearm, also assists in elbow flexion.

Question 14

The landmark for the end of the axillary artery and the beginning of the brachial artery is which muscle?

Accepted Answer

The axillary artery becomes the brachial artery at the lower border of the teres major muscle.

Question 15

The acromioclavicular joint is what type of joint?

Accepted Answer

The acromioclavicular joint is a synovial joint, which means it is a joint that has a synovial cavity and is capable of a wide range of movement.

Question 16

The pronator quadratus muscle receives its innervation from which nerve?

Accepted Answer

The pronator quadratus muscle is innervated by the median nerve. This muscle is involved in pronation of the forearm.

Question 17

The skin over the dorsum of the hand (not the digits) is supplied by branches of which two nerves?

Accepted Answer

The skin over the dorsum of the hand (excluding the digits) is innervated by branches of the ulnar nerve and the superficial branch of the radial nerve. The ulnar nerve supplies the area over the hypothenar eminence and the medial side of the hand, while the superficial branch of the radial nerve covers the majority of the dorsal hand's lateral aspect.

Question 18

Functions of the clavicle include each of the following EXCEPT:

Accepted Answer

The clavicle does not participate in the formation of the shoulder joint; that role is primarily attributed to the scapula and the humerus. The clavicle connects to the scapula at the acromioclavicular joint but is not part of the glenohumeral (shoulder) joint itself.

Question 19

Which of the following arteries does NOT contribute to the collateral circulation around the scapula?

Accepted Answer

The lateral thoracic artery does not contribute to the collateral circulation around the scapula.

Question 20

Which pair of muscles helps form the boundaries of the cubital fossa?

Accepted Answer

The cubital fossa is anatomically defined by the brachioradialis laterally and the pronator teres medially, making option D correct.

Quiz 2: Upper Limb