Question 1

Which anatomical structure forms the anterior wall of the axilla?

Accepted Answer

Pectoralis major and pectoralis minor muscles

Question 2

The cervico-axillary canal (vértice of the axilla) is bounded by which three structures?

Accepted Answer

Clavicle, superior border of scapula, and lateral border of 1st rib

Question 3

A patient presents with weakness in arm adduction and flexion. Which muscle, forming part of the anterior axillary wall, is most likely affected?

Accepted Answer

Pectoralis major

Question 4

Which of the following best describes the medial wall of the axilla?

Accepted Answer

Formed by the ribs and serratus anterior muscle

Question 5

If the axillary artery is compressed at the cervico-axillary canal, which region will most likely experience reduced blood flow?

Accepted Answer

Upper limb

Question 6

Which nerve passes through the quadrangular space of the axilla?

Accepted Answer

Axillary nerve

Question 7

A fracture of the surgical neck of the humerus may damage which structure passing through the quadrangular space?

Accepted Answer

Axillary nerve and posterior circumflex humeral artery

Question 8

Which muscle forms the posterior wall of the axilla along with the teres major and latissimus dorsi?

Accepted Answer

Subscapularis

Question 9

During a surgical procedure, the surgeon must avoid damaging the contents of the cervico-axillary canal. Which of the following is NOT a content of this canal?

Accepted Answer

Cephalic vein

Question 10

A patient suffers a stab wound to the lateral wall of the axilla. Which muscle is most likely injured?

Accepted Answer

Coracobrachialis

Question 11

Which of the following equations correctly represents the calculation of the surface area of a triangular space in the axilla, given base $$b$$ and height $$h$$?

Accepted Answer

$$A = \frac{1}{2} b h$$

Question 12

If the axillary vein is occluded, which of the following symptoms is most likely to occur?

Accepted Answer

Edema of the upper limb

Question 13

Which anatomical space allows passage of the radial nerve and profunda brachii artery?

Accepted Answer

Triangular interval

Question 14

A lesion of the axillary nerve would most likely result in which clinical sign?

Accepted Answer

Deltoid muscle paralysis and loss of shoulder abduction

Question 15

Which of the following best describes the boundaries of the triangular space of the axilla?

Accepted Answer

Teres minor, teres major, long head of triceps brachii

Question 16

Which vessel is most at risk during a surgical procedure involving the quadrangular space?

Accepted Answer

Posterior circumflex humeral artery

Question 17

A patient with a lesion at the cervico-axillary canal may present with which of the following deficits?

Accepted Answer

Impaired upper limb movement and sensation

Question 18

Which muscle is NOT a component of the posterior wall of the axilla?

Accepted Answer

Pectoralis minor

Question 19

Which of the following statements about the axilla is correct?

Accepted Answer

The axilla is a pyramidal space located at the junction of the arm and thorax

Question 20

Which structure forms the base (floor) of the axilla?

Accepted Answer

Skin, subcutaneous tissue, and axillary fascia

Anatomy of the Axilla: Structure and Boundaries (Upper Limb Anatomy I)

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