Brachial Plexus Part 4 Flashcards
T/F: the superficial branch of the radial nerve penetrates the supinator muscle, gives off a series of branches to supply posterior forearm muscles before terminating.
False; this is true of the deep branch
What does the deep branch of the radial nerve terminate as?
posterior interosseous nerve
Which surface of the hand does the superficial branch of the radial nerve travel to ultimately?
the posterior surface
What muscle does the superficial branch of the radial nerve travel with?
brachioradialis
What branch of the radial nerve comes off in the upper arm to supply the skin on the posterior side of the upper arm?
posterior cutaneous nerve of the arm
Where does the inferior lateral cutaneous nerve of the arm branch off of the radial nerve?
in the middle arm
What muscles are supplied by the branches given off of the radial nerve in the arm?
triceps brachii (all 3 heads) and the anconeus (by way of a branch off the branch to the medial head of the triceps brachii)
What nerve comes off of the radial nerve in the upper arm to supply a narrow area of skin on the lateral side of the posterior arm?
posterior cutaneous nerve of the forearm
What muscles are supplied by branches given off of the radial nerve at the level of the lateral epicondyle?
brachioradialis and extensor carpi radialis longus
What does the radial nerve split into once in the forearm?
deep and superficial branches
What does the superficial branch of the radial nerve give off after traveling to the hand?
dorsal digital nerves
Which branch of the radial nerve supplies sensory info to the radial side of the posterior hand?
superficial branch
Which branch of the radial nerve provides sensory info to the extensor side of the thumb?
superficial branch
What nerve provides sensory info to the the extensor side of the proximal phalanges of digits 2 and 3 as well as the lateral half of the extensor side of the ring finger?
superficial branch of the radial nerve
which branch of the radial nerve gives off the communicating branch with the ulnar nerve?
superficial branch
What does forearm muscles are supplied by the deep branch of the radial nerve?
extensor carpi radialis brevis, supinator, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, abductor pollicis longus, and extensor pollicis brevis
(basically everything on the back of the forearm)
T/F: abductor pollicis longus is a thenar muscle.
false
What is the terminal branch of the deep branch of the radial nerve?
posterior interosseous nerve
What does the posterior interosseous nerve supply?
extensor pollicis longus and extensor indicis
T/F: the radial nerve sends articular branches to the elbow joint.
False; only sends articular branches to the shoulder and wrist
What two reflexes associated with the radial nerve typically occur at the same time? (clinical consideration)
brachioradialis and triceps reflexes
What nerve is wrist drop typically associated with?
radial nerve
What brachial plexus injury is associated with C5/C6 roots, birth trauma, “waiter’s tip” posture, and Erb’s Palsy?
Erb-Duchenne
What brachial plexus injury typically involves the suprascapular, axillary, and/or musculocutaneous nerves?
Erb-Duchenne
What brachial plexus injury involves C8/T1 roots, birth trauma or overhead injury (falling and catching self on tree limb), and results in weak hand muscles?
Klumpke
What is another name for Klumpke?
Klumpke palsy or Dejerine-Klumpke palsy
If a person suffering from Klumpke palsy has T1 involvement what other condition may be present?
Horner’s syndrome -> ptosis and miosis
