Anatomical spaces

Question 1

Axilla

Answer 1

Boundaries:
Anterior wall: Pectoralis major and minor
Posterior wall: Subscapularis, teres major, latissimus dorsi
Medial wall: Serratus anterior and thoracic wall
Lateral wall: Intertubercular sulcus of humerus
Contents:
Axillary artery and vein
Brachial plexus (cords and terminal branches)
Lymph nodes
Fat

Question 2

Quadrangular space

Answer 2

Boundaries:
Superior: Teres minor
Inferior: Teres major
Medial: Long head of triceps
Lateral: Surgical neck of humerus
Contents:
Axillary nerve
Posterior circumflex humeral artery

Question 3

Triangular space

Answer 3

Boundaries:
Superior: Teres minor
Inferior: Teres major
Lateral: Long head of triceps
Contents:
Scapular circumflex artery

Question 4

Triangular interval

Answer 4

Boundaries:
Superior: Teres major
Medial: Long head of triceps
Lateral: Lateral head of triceps or humerus
Contents:
Radial nerve
Deep brachial artery (profunda brachii)

Question 5

Cubital fossa

Answer 5

Boundaries:
Superior: Line between medial and lateral epicondyles
Medial: Pronator teres
Lateral: Brachioradialis
Roof: Bicipital aponeurosis
Floor: Brachialis and supinator
Contents:
Tendon of biceps brachii
Artery: Brachial artery (with bifurcation)
Nerve: Median nerve

Question 6

Carpal tunnel

Answer 6

Boundaries:
Roof: Flexor retinaculum
Floor: Carpal bones
Contents:
Median nerve
Tendons of:
Flexor digitorum superficialis (4)
Flexor digitorum profundus (4)
Flexor pollicis longus (1)

Question 7

Anatomical snuffbox

Answer 7

Boundaries:
Medial: Extensor pollicis longus
Lateral: Abductor pollicis longus & extensor pollicis brevis
Floor: Scaphoid and trapezium
Contents:
Radial artery
Cephalic vein (superficial)
Superficial branch of radial nerve

Question 8

Guyon’s canal (Ulnar canal

Answer 8

Boundaries:
Roof: Palmar carpal ligament
Floor: Flexor retinaculum
Medial wall: Pisiform
Lateral wall: Hook of hamate
Contents:
Ulnar nerve
Ulnar artery