forearm patterns

Question 1

What is the motor innervation for all muscles in posterior (post axial, dorsal) the upper arm and fore arm?

Answer 1

radial nerve

motor innervation does not extend into the hand

Question 2

What is the cutaneous innervation for dorsal hand?

Answer 2

Radial nerve

Question 3

What innervates all the muscles in the anterior upper arm?

Answer 3

Musclocutaneous nerve

Question 4

What innervates all the muscles in the anterior forearm?

Answer 4

median nerve
exceptions: (flexor carpi ulnaris, medial half of the flexor digitorum profundus ulnar N.)
(brachioradialis radial N )

Question 5

What is the nerve that innervate all the muscles in the hand?

Answer 5

ulnar nerve

Question 6

What is the exception to the ulnar nerve in the hand?

Answer 6

Innervation by the median nerve 
three thenar muscles of the thumb 
abductor pollicis brevis 
flexor pollicis brevis 
opponens pollicis 
lumbrical MM to 2 and 3 digit

Question 7

What is the origin of all superficial flexors of the forearm?

Answer 7

medial epicondyle

Question 8

What is the origin of all superficial extensors?

Answer 8

lateral epicondyle

Question 9

Where does the deep extensor and flexor MM arise?

Answer 9

combination of radius, ulna and interosseous membrane

Question 10

What is the axis of rotation for the forearm?

Answer 10

head of radius -> interosseous membrane -> head of ulna
at the elbow the head of radius rotates on its axis
at the wrist the radius rotate around the ulna

Question 11

Where does the Muscles digits (flexor or extensor digitorum) run?

Answer 11

up midline

Question 12

Where does the muscles that move wrist (flexor or extensor) run?

Answer 12

towards the sides of the forearm

Question 13

What is brachiradialis?

Answer 13

follows all superficial extensor patterns but is a flexor