Upper Extremity Nerves Flashcards
What nerve roots make Axillary Nerve?
C5-C6
What nerve roots make Musculocutaneous Nerve?
C5-C7
What nerve roots make Radial Nerve?
C5-T1
What nerve roots make Median Nerve?
C5-T1
What nerve roots make Ulnar Nerve?
C8-T1
What nerve roots make recurrent branch of Median nerve?
C5-T1
Fractured surgical neck of humerus; anterior dislocation of humerus. What nerve?
Axillary
Upper trunk compression. What nerve?
Musculocutaneous
Midshaft fracture of humerus; compression of axilla, eg, due to crutches or sleeping with arm over chair (“Saturday night palsy”). What Nerve?
Radial
Supracondylar fracture of humerus (proximal lesion); carpal tunnel syndrome and wrist laceration (distal lesion). What nerve?
Median
Fracture of medial epicondyle of humerus “funny bone” (proximal lesion); fractured hook of hamate (distal lesion)
Ulnar
Superficial laceration of palm
Recurrent branch of median nerve
Flattened deltoid
Loss of arm abduction at shoulder (> 15 degrees) Loss of sensation over deltoid muscle and lateral
arm
Axillary Nerve
Loss of forearm flexion and supination Loss of sensation over lateral forearm
Musculocutaneous
Wrist drop: loss of elbow, wrist, and finger extension
decreased grip strength (wrist extension necessary for maximal action of flexors)
Loss of sensation over posterior arm/forearm and dorsal hand
Radial Nerve
“Ape hand” and “Pope’s blessing”
Loss of wrist flexion, flexion of lateral fingers,
thumb opposition, lumbricals of 2nd and 3rd
digits
Loss of sensation over thenar eminence and
dorsal and palmar aspects of lateral 3 1⁄2 fingers
with proximal lesion
Tinel sign (tingling on percussion)
Median Nerve
“Ulnar claw” on digit extension
Radial deviation of wrist upon flexion (proximal
lesion)
Loss of wrist flexion, flexion of medial fingers,
abduction and adduction of fingers (interossei),
actions of medial 2 lumbrical muscles Loss of sensation over medial 1 1/2 fingers including hypothenar eminence
Ulnar Nerve
“Ape hand”
Loss of thenar muscle group: opposition,
abduction, and flexion of thumb
No loss of sensation
Recurrent Branch of Median Nerve
