Geographical Areas Of The Upperlimb

Front 1

Rotator (Musculotendinous) Cuff

Back 1

Is formed by the tendons of the SITS; fuses with the joint capsule; and provides mobility.

Keeps the head of the humerus in the glenoid fossa during movements and thus stabilizes
the shoulder joint.

Front 2

Quadrangular Space

Back 2

Is bounded superiorly by the teres minor and subscapularis muscles, inferiorly by the
teres major muscle, medially by the long head of the triceps, and laterally by the surgical
neck of the humerus.

Front 3

Triangular Space (Upper)

Back 3

Is bounded superiorly by the teres minor muscle, inferiorly by the teres major muscle, and
laterally by the long head of the triceps

Contains the circumfLex scapular vessels.

Front 4

Triangular Space (Lower)

Back 4

Is formed superiorly by the teres major muscle, medially by the long head of the triceps,
and laterally by the medial head of the triceps.

Contains the radial nerve and the profunda brachii (deep brachial) artery.

Front 5

Triangle of Auscultation

Back 5

Is bounded by the upper border of the latissimus dorsi muscle, the lateral border of the
trapezius muscle, and the medial border of the scapula; its fl oor is formed by the rhomboid
major muscle.

Is the site at which breathing sounds are heard most clearly.

Front 6

Cubital Fossa

Back 6

Is a V-shaped interval on the anterior aspect of the elbow that is bounded laterally by the
brachioradialis muscle, medially by the pronator teres muscle, and superiorly by an imaginary horizontal line connecting the epicondyles of the humerus with a floor formed by the brachialis and supinator muscles.

Front 7

Carpal Tunnel

Back 7

Transmits the median nerve and the tendons of flexor pollicis longus, flexor digitorum profundus,
and flexor digitorum superficialis muscles.

Front 8

Anatomic Snuffbox

Back 8

Is a triangular interval bounded medially by the tendon of the extensor pollicis longus
muscle and laterally by the tendons of the extensor pollicis brevis and abductor pollicis
longus muscles.

Front 9

Somatic Motor Nerves

Back 9

radial, axillary, median, musculocutaneous, and ulnar nerves and ventral or dorsal
primary rami and other nerves.

Front 10

Cutaneous Nerves

Back 10

medial brachial, medial antebrachial, lateral antebrachial, and other cutaneous
nerves.