Anterior Forearm Flashcards
muscles of superficial layer of anterior forearm (medial to lateral)
Flexor carpi ulnaris
Palmaris longus
Flexor carpi radialis
Pronator teres
muscles of intermediate layer of anterior forearm
flexor digitorum SUPERFICIALIS M
muscles of deep layer of anterior forearm (medial to lateral)
flexor digitorum profundus
Flexor pollicus longus
Pronator quadratus
cutaneous innervation of lateral proximal arm
axillary n
cutaneous innervation of the lateral distal arm
radial n
also innervates the anatomical snuffbox
cutaneous innervation of the armpit to medial epicondyle
medial brachial cutaneous n
cutaneous innervation of medial forearm (and some biceps)
medial antibrachial n
cutaneous innervation of lateral forearm
lateral antibrachial n
cutaneous innervation of 4th and 5th digits
ulnar n
cutaneous innervation of 1 2 3 digits
median n
superficial muscles of the anterior compartment
pronator teres
flexor carpi radialis
palmaris longus
flexor carpi ulnaris** (innervated by ulnar n)
intermediate muscles of the anterior compartment of the forearm
flexor digitorum superficialis
deep muscles of the anterior compartment of the forearm .
flexor digitorum profundus*** (digits 4,5 innervated by ulnar)
flexor pollicis longus
pronator quadratus
all muscles of the anterior compartment of the forearm are innervated by ________ n with the exception of what 2 muscles
all are median nerve innervated except
flexor carpi ulnaris
flexor digitorum profundus (to fingers 4,5)
which are innervated by the ulnar n
origin/insertion/innervation/action of pronator teres
humeral head/meidal epicondyle –> lateral radius
median n
forearm pronation, weak elbow flexion
origin/insertion/innervation/action of flexor carpi radialis m
medial epicondyle –>base of 2nd metacarpal
median n
wrist flexion and abduction
radial deviation of hand
abduction of the wrist is performed by
flexor carpi radialis
and flexor pollicis longus
origin/insertion/innervation/action of palmaris longus
medial epicondyle –> palmar aponeurosis
Median n
flexion tightens palmar aponeurosis
weak elbow flexion
origin/insertion/innervation/action of flexor carpi ulnaris
humeral head-medial epicondyle ulnar head - olecranon inserts on pisiform, hook of hamate, base of 5th metacarpal ulnar n flexion and adduction of hand
adduction of the wrist is performed by this muscle
flexor carpi ulnaris m
origin/insertion/innervation/action of flexor digitorum superficialis m
humeral-ulnar head: medial epicondyle/cornoid process
radial head: upper anterior border of radius
inserts into sides of middle phalanges of digits 2-5
median n
weak elbow flexion
wrist, MCP, PIP joint flexion at 2-5
origin/insertion/innervation/action of flexor digitorum profundus m
ulna and IO membrane to distal phalanges of 2-5 digits
median n (digits 2,3)
ulnar n (digits 4,5)
wrist, MCP, PIP, DIP, of digits 2-5 == flexion
origin/insertion/innervation/action of flexor pollicis longus m
radius and IO membrane to distal phalanx of thumb (palmar surface)
median n
wrist flexion and abduction of hand
flexion at carpometacarpal joint of thumb, MCP and IP joints
origin/insertion/innervation/action of pronator quadratus
distal quarter of anterior ulna to distal quarter of anterior radius
median n
pronation of hand
stabilizes distal radioulnar joint
condition of inflamed tendons of medial epicondyle due to excessive elbow and wrist flexion - painful swelling and pressure on median n
medial epicondylitis tendonitis
golfers/pitchers/bowlers elbow
pronator teres and flexor carpi radialis primarily targeted
after the median n crosses the cubital fossa with the brachial artery, it passes between what muscle
median n passes between heads of pronator teres m
bretween humeral head and ulnar head
after passing through the heads of pronator teres, the median n runs between what two muscles
flexor digitorum superficialis
flexor digitorum profundus
after passing between FDS and FDP, the median nerve runs through what struc
transverse carpal ligament before it enters the palm
the anterior interosseous branch of the median n arises where
in the cubital fossa
descends down IO membrane with anterior interosseous artery
what structures does the anterior interosseous branch of the median nerve supply
radial part of Flexor Digitorum Profundus
Flexor Pollicis longus and pronator quadratus m
where does the ulnar nerve enter the forearm
posterior medial epicondyle by way of the groove for the ulnar n of the humerus
the ulnar nerve becomes superficial in the distal forearm before passing between what two structures
transverse carpal ligament and palmar carpal ligament to enter the palm
branches of the ulnar artery
ulnar recurrent a (anterior and posterior) common interosseous a (anterior IO and posterior IO) palmar carpal branch artery muscular branches
branches of the radial a
radial recurrent a
Palmar carpal branch a
muscular branches
Anterior interosseous syndrome
branch of median n supplies Flexor pollicus longus m flexor digitorum profundus m (index and middle digits) Weakness in pincer movement
abnormal ok sign
hand of benediction is characterized by
dmg to median n
Flexion of PIJ 1-3, DIJ and MPJ of 2,3, lumbricals 1,2 and thenar group ar elost with injury at elbow level
Claw hand is characterized by
dmg to distal ulnar n
MPJ hyperextended and IPJ flexed due to unopposed action of extensors and flexor digitorum profundus with injury at wrist level
