Forearm

Question 1

Where is the principal attachment of the forearm?

Answer 1

Through the ulnar

Question 2

What direction are most fibers oriented in the forearm?

Answer 2

They are oriented superior to inferior from the radius, allowing force to transfer over

Question 3

What is the principal attachment of the forearm?

Answer 3

The ulna

Question 4

What is the antebrachial fascia?

Answer 4

It is the deep fascia of the forearm and it is a continuation of the brachial fascia of the arm. It will form the flexor and extensor retinacula

Question 5

What is the extensor retinaculum?

Answer 5

It is the fascia that extends across the carpal joint from the anterior border of the radius to the triquetrum and pisiform bones

Question 6

What is the flexor retinaculum?

Answer 6

It is the transverse carpal ligament. It is attached to the pisiform and the hook of hamate. It forms the carpal tunnel and the canal of Guyon

Question 7

What kind of muscles does the posterior side of the forearm have?

Answer 7

Smaller, flatter muscles because extensors are smaller and less tone than flexors

Question 8

What kind of muscles does the anterior side of the forearm have?

Answer 8

Large, more toned muscles; flexor muscles which are twice the size of the extensors

Question 9

What are the superficial muscles of the anterior forearm?

Answer 9

The pronator teres, flexor carpi radialis, palmaris longus, flexor digitorum superficialis, and flexor carpi ulnaris

Question 10

What is the common origin of the superficial muscles of the anterior forearm?

Answer 10

The medial epicondyle from the humerus

Question 11

What nerve innervates the superficial muscles of the anterior forearm?

Answer 11

All the nerves are innervated by the medial nerve except for the flexor carpi ulnaris, which is innervated by the ulnar nerve

Question 12

What are the deep muscles of the anterior forearm?

Answer 12

The flexor digitorum profundus, flexor pollicis longus, and pronator quadratus

Question 13

What nerve innervates the deep muscles of the anterior forearm?

Answer 13

The median nerve

Question 14

What are the superficial muscles of the posterior forearm?

Answer 14

Brachioradialis, anconeus, extensor carpi radialis longus/brevis, extensor digitorum, extensor digit minimi, extensor carpi ulnaris

Question 15

What nerve innervates the superficial muscles of the posterior forearm?

Answer 15

The radial nerve

Question 16

What are the deep muscles of the posterior forearm?

Answer 16

Supinator, abductor pollicis longus, extensor pollicis longus/brevis, extensor indicis

Question 17

What nerve innervates the deep muscles of the posterior forearm?

Answer 17

The radial nerve

Question 18

What is the anatomical snuff box?

Answer 18

Formed by the abductor pollicis longus and extensor pollicis longus/brevis. It contains the radial artery and branches of the superficial radial nerve

Question 19

What does the radial artery lie deep to?

Answer 19

The brachioradialis muscles

Question 20

Where is the optimal site to take the radial pulse?

Answer 20

At the wrist because the artery is superficial at that part of the arm

Question 21

What does the ulnar artery lie deep to?

Answer 21

The superficial flexors in the forearm

Question 22

What artery does the ulnar artery give off?

Answer 22

The common interosseous artery in the cubital fossa

Question 23

What are the branches of the common interosseous artery?

Answer 23

The anterior and the posterior interosseous