Brachial Plexus Part 3 Flashcards
What cords contribute to the median nerve?
lateral and medial cord
What cord levels contribute fibers to the median nerve?
C6-T1
T/F: Just like the ulnar nerve, the median nerve travels through the arm in the medial bicipital sulcus and gives off no branches in the arm.
True
What muscle heads does the median nerve travel between after crossing the elbow on the anterior side to enter the forearm?
passes between the two heads of the pronator teres
What five muscles in the forearm are innervated by the median nerve?
pronator teres, flexor carpi radialis, palmaris longus, flexor digitorum superficialis, and pronator quadratus
How does the median nerve innervate the pronator quadratus?
by way of the anterior interosseous nerve of the forearm which is given off the median nerve in the elbow
Where is the palmar branch of the median nerve given off?
in the distal third of the forearm
What supplies the skin of the thenar eminence, lateral wrist and palm?
palmar branch of the median nerve
T/F: the median nerve passes through the carpal tunnel
True
After passing through the carpal tunnel, what does the median nerve divide into?
three common palmar digital nerves
What supplies the first two lumbricals of the hand?
common palmar digital nerve of the median nerve
Which branch of the median nerve supplies the abductor pollicis brevis, flexor pollicis brevis (superficial head), and the opponens pollicis?
the first common palmar digital nerve
T/F: in the hand, the thenar eminence and the first 2 lumbricals are the only muscles supplied by the median nerve.
true
What does each common palmar digital nerve of the median nerve split into?
two proper palmar digital nerves
What is supplied by the proper palmar digital nerve?
the skin over the lateral three and a half digits (sensory only)
T/F: the median nerve supplies the periosteum of the forearm, the elbow, radiocarpal and midcarpal joints, and usually communicates with the ulnar nerve at the wrist.
True
What clinical consideration of the median nerve involves only the 4th and 5th fingers closing when trying to make a fist?
hand of oath/benediction
T/F: carpal tunnel syndrome is associated mostly with the ulnar nerve.
false; median nerve
T/F: injury to the median nerve can lead to an inability to pronate.
True
What branches are given off of the posterior cord?
superior subscapular nerve, thoracodorsal nerve, inferior subscapular nerve, axillary nerve, and the radial nerve
T/F: the superior subscapular nerve, the inferior subscapular nerve and the axillary nerve all receive fibers from C5 and C6.
True
T/F: the superior subscapular nerve supplies the subscapularis and the teres major.
False; this is true of the inferior subscaular nerve. The superior subscapular nerve only supplies the subscapularis
What cord levels contribute to the thoracodorsal nerve?
C6, C7, and C8
What nerve travels along the posterior axillary wall to supply the latissimus dorsi?
Thoracodorsal nerve
What nerve travels posteriorly around the surgical neck of the humerus to supply the deltoid and teres minor muscles?
Axillary nerve
What branch does the axillary nerve give off at the same level that the branch to the teres minor is given off? What does it supply?
superior lateral cutaneous nerve of the arm (sensory);
supplies skin over the lateral shoulder and upper arm
What cord levels contribute fibers to the radial nerve?
C5-C8 and sometimes T1
What nerve supplies all of the muscles in the posterior compartment of the arm and forearm?
radial nerve
T/F: the radial nerve spirals around to the posterior of the humerus from the medial bicipital sulcus.
true
The radial nerve passes into the forearm on the anterior side of the elbow after traveling between what two muscles?
brachialis and brachioradialis
Where does the radial nerve split into superficial and deep branches?
at the level of the radial head
