Regional Structures (axilla and cubital fossa)

Question 1

Boundaries of the axilla: apex

Answer 1

• post. clavicle b.
• sup. scapula b.
• external border of 1st rib

Question 1

Boundaries of the axilla: base

Answer 1

Skin/fascia of armpit

Question 2

Boundaries of the axilla: ant. wall

Answer 2

• pec maj and pec min
• (ant. axillary fold)

Question 3

Boundaries of the axilla: post. wall

Answer 3

• subscapularis
• teres maj/lat dorsi
• (post. axillary fold)

Question 4

Boundaries of the axilla: medial wall

Answer 4

• upper ribs
• intercostal muscles
• serratus ant.

Question 5

Boundaries of the axilla: lateral wall

Answer 5

• bicipital groove of humerus b.
• (biceps brachii, coracobrachialis, triceps brachii)

Question 6

Contents of the axilla

Answer 6

• Axillary a. and v.
• brachial plexus and branches
• fascia
• lymph nodes
• proximal part of cephalic v.

Question 7

Landmarks of axilla: triangular space

Answer 7

Lateral: long head of triceps brachii
Superior: teres minor
Inferior: teres major

Contents: branches of suprascapular n. (circumflex scapular a.)

Question 8

Landmarks of axilla: quadrangular space

Answer 8

• Lateral: humerus
• Medial: long head of triceps brachii
• Superior: teres minor
• Inferior: teres major

Contexts: axillary n., post. humeral circumflex a.

Question 9

(ante)cubital fossa boundaries: lateral

Answer 9

brachioradialis

Question 10

(ante)cubital fossa boundaries: medial

Answer 10

pronator teres

Question 11

(ante)cubital fossa boundaries: apex

Answer 11

where the 2 muscles of brachioradialis and pronator teres meet

Question 12

(ante)cubital fossa boundaries: base

Answer 12

imaginary line across both epicondyles

Question 13

(ante)cubital fossa boundaries: floor

Answer 13

brachialis and supinator

Question 14

(ante)cubital fossa boundaries: roof

Answer 14

fascia and biceps brachii aponeurosis

Question 15

(ante)cubital fossa contents:

Answer 15

biceps brachii tendon, brachial a., median n. and radial n.

Question 16

Anatomical snuffbox

Answer 16

• extensor pollicis longus
• extensor pollicis brevis
• abductor pollicis longus
  Contents: radial a., base of scaphoid b., trapezium b.