Question 1

Which of the following best describes the function of the clavicle in the pectoral girdle?

Accepted Answer

It acts as a strut to keep the scapula in place, allowing the arm to hang freely.

Question 2

A patient presents with a shoulder injury after falling on an outstretched hand. X-ray reveals a fracture at the lateral end of the clavicle. Which ligament is most likely to be compromised, potentially leading to acromioclavicular joint instability?

Accepted Answer

Coracoclavicular ligament

Question 3

Which anatomical feature of the scapula serves as the attachment site for the long head of the biceps brachii muscle?

Accepted Answer

Supraglenoid tubercle

Question 4

During abduction of the arm, which movement occurs at the scapulothoracic joint to allow full range of motion?

Accepted Answer

Upward rotation of the scapula

Question 5

A patient is unable to supinate their forearm after an injury. Which anatomical structure is most likely damaged?

Accepted Answer

Head of the radius

Question 6

Which of the following correctly matches the bone and its anatomical landmark?

Accepted Answer

Humerus – deltoid tuberosity

Question 7

The annular ligament is essential for which of the following joint movements?

Accepted Answer

Rotation of the head of the radius during pronation and supination

Question 8

A child presents with 'nursemaid's elbow' after being pulled by the hand. Which structure is most likely displaced?

Accepted Answer

Head of the radius

Question 9

Which carpal bone articulates with the first metacarpal to form the saddle joint of the thumb?

Accepted Answer

Trapezium

Question 10

A fracture of the surgical neck of the humerus is most likely to endanger which neurovascular structure?

Accepted Answer

Axillary nerve

Question 11

Which of the following best describes the articulation at the elbow joint?

Accepted Answer

The trochlea of the humerus articulates with the trochlear notch of the ulna.

Question 12

Which ligament stabilizes the head of the radius against the ulna during pronation and supination?

Accepted Answer

Annular ligament

Question 13

A patient with a fractured scaphoid bone is at risk for which complication due to its blood supply?

Accepted Answer

Avascular necrosis

Question 14

Which of the following equations best represents the mechanical advantage of a lever system, such as the forearm during elbow flexion?

Accepted Answer

$$MA = \frac{d_{effort}}{d_{load}}$$

Question 15

Which movement would be most affected by damage to the acromioclavicular joint?

Accepted Answer

Raising the arm above the head

Question 16

A patient is unable to abduct their arm beyond 15 degrees. Which muscle is most likely affected?

Accepted Answer

Deltoid

Question 17

Which of the following statements about the pectoral girdle is correct?

Accepted Answer

It consists of the clavicle and scapula, providing attachment for upper limb muscles.

Question 18

Which anatomical feature is found on the distal end of the humerus and articulates with the head of the radius?

Accepted Answer

Capitulum

Question 19

A patient has difficulty flexing the wrist and fingers after a fracture of the distal humerus. Which nerve is most likely injured?

Accepted Answer

Median nerve

Question 20

Which of the following best describes the role of the coracoid process?

Accepted Answer

It serves as an attachment site for muscles and ligaments of the shoulder.

Anatomy of the Upper Limb: Pectoral Girdle and Upper Extremity Bones & Joints

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