Extensor Forearm Lecture

Question 1

How do you distinguish between the dorsal and palmar parts of the hand?

Answer 1

The hook of the hammate, tubercle of the trapezium, and pisiform are all distinctive on the palmar side.

Question 2

What carpal makes up the majority of the wrist joint?

Answer 2

Scaphoid

Question 3

What are the superficial extensors of the forearm?

Answer 3

Brachioradialis (flexor at elbow), Extensor Carpi Radialis Longus, Extensor Carpi Radialis Brevis, Extensor Digitorum, Extensor Digiti Minimi, Extensor Carpi Ulnaris

Question 4

What are the deep extensors of the forearm?

Answer 4

Supinator, Abductor Pollicis Longus, Extensor Pollicis longus, Extensor Pollicis Brevis, Extensor Indicies

Question 5

What are the superficial Flexors of the forearm?

Answer 5

Pronator Teres (Pronation), Flexor Carpi Radialis, Flexor Palmaris, Flexor Digitorum Superficialis, Flexor Carpi Ulnaris

Question 6

What are the deep flexors of the forearm?

Answer 6

Flexor Digitorum Profundus, Flexor Pollicis longus, Pronator quatratus

Question 7

What membrane separates anterior and posterior compartments of the forearm?

Answer 7

Interosseous membrane, intermuscular septum

Question 8

What nerves are involved in supination?

Answer 8

Musculocutaneous (Biceps), Deep radial (Supinator)

Question 9

What happens between the radius, ulna, and interosseous membrane when you fall on an outstretched hand?

Answer 9

Most of the intitial force goes to radius and into the interosseous membrane and transferred to the ulna and into elbow

Question 10

When is the brachioradialis effective?

Answer 10

When the elbow is already semi-flexed

Question 11

What muscle counter the flexion of flexor carpi ulnaris and flexor carpi radialis?

Answer 11

Extensor carpi ulnaris, extensor carpi radialis longus and brevis

Question 12

What would happen if some of the extensors were not countered by flexors or vise-versa?

Answer 12

Movement of the wrist would be choppy

Question 13

What counters the adduction caused by flexion of FCU and ECU?

Answer 13

FCR and ECRL/B

Question 14

Muscles that act on the thumb run the course of what bone?

Answer 14

Radius

Question 15

What is a possible point of compression for the radial n. in the forearm?

Answer 15

At the suppinator, It becomes the deep radial n. at the lateral border of the cubital fossa then passes through the supinator to become the interosseous n.

Question 16

What structures create the boundaries for the anatomical snuff box?

Answer 16

Extensor pollicis longus (dorsal), extensor pollicis brevis (palmar), Extensor retinaculum

Question 17

What nerve and artery are in the antatomical snuff box?

Answer 17

Radial n., (radial a.) Dorsal carpal arch of radial artery

Question 18

What is the major concern with a scaphoid fracture?

Answer 18

Avascular necrosis

Question 19

What artery runs along the interosseous membrane?

Answer 19

Posterior interosseous a.

Question 20

What nerve supplies the pinky and half of the ring finger?

Answer 20

Ulnar

Question 21

What nerve supplies the first three digits on the palmer side of the hand and the nail beds on the posterior side of the same digits?

Answer 21

Median

Question 22

What nerve supplies the dorsal side of the hand for the first 3.5 digits?

Answer 22

Superficial Radial