Ant. and Post. Forearm Flashcards
what is the primary blood supply to the post. forearm?
radial a.
recurrent interosseous a.
post. interosseous a.
ulnar a.
what supplies the ant. hand?
sup. palmar arch - ulnar a.
deep palmar arch - radial a.
what are the muscles of the superficial ant. forearm?
PASS FAIL PASS FAIL pronator teres flexor carpi radialis palmaris longus flexor carpi ulnaris
what is the innervation of most ant. forearm muscles?
blood?
Median n. (except) flexor carpi ulnaris
ulnar a. except pronator teres
pronator teres action
blood?
pronate and flex forearm @ elbow
ant. ulnar recurrent a.
flexor carpi radialis action
flex and ABduct hand @ wrist
Palmaris longus action
flex hand @ wrist, tenses palmar aponeurosis
flex carpi ulnaris action
innervation
flex and ADDuct hand at wrist
ulnar n. (C7, 8)
what happens in Cubital Tunnel Syndrome?
ulnar n. compressed by the humeral and ulnar heads of flexor carpi ulnaris
numbness and tingling in medial part of palm and medial digits
what muscles is in the intermediate layer?
action?
innervation?
flexor digitorum superficialis
flexes middle phalanges at prox IP joint
flexes prox phalanges at MP joint
median n. (C7, C8, T1)
what muscles make up the deep layer?
blood supply?
Flexor digitorum profundus
Flexor pollicus longus
Pronator quadratus
ant. interosseous a.
flexor digitorum profundus action
innervation
flexes distal phalanges at IP joints
median and ulnar n. (C8, T1)
Flexor pollicus longus action
innervation
flex thumb
median n. via. ant. interosseous (C8, T1)
Pronator quadratus action
innervation
pronate forearm, deep fibers bind radius and ulna
median n. via ant. interosseous n. (C8, T1)
which muscle is responsible for the power grip?
Flexor digitorum profundus
what does the Ulnar n. travel through?
Guyon’s canal lateral to pisiform
which muscles does the radial n. innervate?
brachioradialis
extensor carpi radialis longus
what muscles does the deep radial n. innervate?
extensor carpi radialis brevis
supinator
which muscles does the post. interosseous n. innervate?
Extensor carpi ulnaris, digitorum, digiti minimi, indicis, pollicus longus and brevis
Abductor pollicus longus
7 total
brachioradialis action
innervation
flex forearm when pronated (mid prone)
radial n. (C5,6,7)
extensor carpi radialis longus action
innervation
extend and ABduct hand @ wrist
radial n. (C6,7)
extensor carpi radialis brevis action
innervation
extend and ABduct hand @ wrist
deep branch radial n. (C7,8)
extensor digitorum action
innervation
extend medial 4 fingers at MP joints, sometimes IP
post. interosseous n. (C7,8)
extensor digiti minimi action
innervation
extend 5th finger at MP joint and also at IP joint
post. interosseous n. (C7,8)
extensor carpi ulnaris action
innervation
extend and ADDuct hand @ wrist
post. interosseous n. (C7,8)
Supinator action
innervation
supinate forearm, bring radial head back to anatomical position
deep branch radial n. (C7,8)
extensor indicis action
innervation
independent extension of 2nd finger, helps extension @ wrist
post interosseous n. (C7,8)
abductor pollicus longus action
innervation
ABduct thumb and extend at CMP joint
post. interosseous n. (C7,8)
Extensor pollicus brevis action
innervation
extend PROX phalanx of thumb at MP joint
extend CMP joint
post. interosseous n. (C7,8)
extensor pollicus longus action
innervation
extend DISTAL phalanx of thumb @ IP joint, extend CMP joint
post. interosseous n. (C7,8)
anatomical snuff box:
floor?
roof?
scaphoid bone
superficial radial n. and fascia
what are the “outcropping muscles”
ABductor pollicus longus
extensor pollicus longus
extensor pollicus brevis
when looking at your hand as it is mid-pronation what is in the anatomical snuff box lateral to medial?
extensor pollicus longus
extensor pollicus brevis
ABductor pollicus longus
(anatomically most lateral)
what is the primary blood supply to the ant. forearm?
ulnar a.
ant. interosseous a.
