Antecubita fossa (425-434)

Question 1

Name the boundaries of the antecubital fossa;

Answer 1

Lateral- brachioradialis.
Medial- pronator teres.
Superior- horizontal line between epicondyles of humerus.
Roof- bicipital aponeurosis, fascia, subcutaneous fat, skin.
Floor- brachilais muscle

Question 2

Name the contents of the antecubital fossa;

Answer 2

Medial to lateral- median nerve (goes between two heads of pronator teres), brachial artery (bifucates into radial & ulnar at apex), biceps tendon (attaches tp radial tuberosity), radial nerve (lateral border). (Veins in roof)

Question 3

Name the structures that lie on the roof of the antecubital fossa;

Answer 3

Median cubital vein (connects basilic and cephalic veins). Medial and lateral cutaneous nerve of forearm.

Question 4

Name the muscles arising from the common flexor origin at the medial epicondyle of the humerus;

Answer 4

Superficial muscles in anterior compartment of foreaarm (flexors)- protnator teres (median nerve), flexor carpi radialis (median nerve), palmar longus (median nerve), flexor carpi ulnaris (ulnar nerve). Intermediate anterior compartment- Flexor digitorum superficialis (median nerve).

(Photo is of left arm [rememvber pronator teres is medial]

Question 5

Which muscles in the flexor compartment of the forearm are not supplied by the median nerve?;

Answer 5

Flexor carpi ulnaris (ulnar nerve). Flexor digitorium profundus (ulnar half by ulnar nerve, medial half by median nerve)

Question 6

Name the muscles arising from the common extensor origin at the lateral epicondyle of the humerus;

Answer 6

Superficial muscles in posterior compartment of forearm (extensors)- Extensor carpi radialis brevis (ECRB) [radial nerve], Extensor digitorum communis (EDC) [radial nerve], Extensor digiti minimi (EDM) [radial nerve], Extensor carpi ulnaris (ECU) [radial nerve], Anconeus [radial nerve]. Deep muscles- Supinator [radial nerve]

Question 7

Where do the following muscles insert? A) Extensor pollicis longus. B) Extensor pollicis brevis. C) Extensor carpi radialis longus. D) Extensor carpi radialis brevis. E) Extensor carpi ulnaris.

Answer 7

A) base of distal phalax thumb. B) base of proximal phalanx thumb. C) base of 2nd metacarpal. D) base of 3rd metacarpal. E) base of 5th metacarpal

Question 8

Name the attachments of the flexor retinaculum;

Answer 8

Radial- scaphoid tubercle & ridge of trapezium. Ulnar- pisiform & hook of hamate. Proximal- deep fascia of forearm. Distal- palmar aponeurosis.

Question 9

Name the structures that pass through the carpal tunnel (under the flexor retinaculum);

Answer 9

x10 structures (9 tendons & 1 nerve). X4 flexor digitorum profundus tendons. X4 flexor digitorum superficialis tendons. X1 flexor pollicis longus tendon. X1 median nerve

Question 10

Name the structures that pass over the flexor retinaculum;

Answer 10

x5 structures. Ulnar nerve and Ulnar artery (Guyon’s canal). Palmaris Longus tendon. Palmar cutaneous branch of median nerve. Superficial radial artery.