Musculocutaneous
Where does this branch originate?
Lateral Cord
What nerve branch must be given off before the posterior cord becomes the radial nerve?
Axillary nerve
The median nerve is responsible for this critical hand movement allowing thumbs to touch the fingertips
What is opposition?
How many cutaneous and motor branches are given off of this nerve in the arm?
Zero
What nerve results as the termination of the axillary nerve?
Upper lateral brachial cutaneous nerve
T/F: This muscle begins after the medial root of the median nerve is given off.
False: it begins after the lateral root of the median nerve is given off
T/F: This nerve courses from medial to lateral in the radial groove in the posterior compartment of the forearm.
False; the nerve courses from medial to lateral in the radial groove in the posterior compartment of the arm.
Which of these is least likely to undergo atrophy in chronic carpal tunnel syndrome?
Abductor pollicis brevis
Flexor pollicis longus
Opponens pollicis brevis
Flexor pollicis brevis
Flexor pollicis longus
In order to pass from the ____ compartment to the ____ compartment it must pierce the ____ lamina of the ____ intermuscular septum to course posterior to the medial epicondyle.
In order to pass from the medial compartment to the posterior compartment it must pierce the posterior lamina of the medial intermuscular septum to course posterior to the medial epicondyle.
How many nerves(both directly and indirectly) branch from the radial nerve to supply part of the skin on the arm? Name them.
2; lower lateral brachial cutaneous nerve(indirectly) and posterior brachial cutaneous nerve(directly)
What muscle does this nerve pierce? How many muscles does it innervate? Name the muscles.
Coracobrachialis; 3 muscles; coracobrachialis, biceps brachii, brachialis
In order to pass from the posterior to anterior compartment of the arm, what must the nerve pierce?
Lateral intermuscular septum
Compression or damage to the median nerve can result in this condition, marked by a weak pinch grip and inability to oppose the thumb
What is carpal tunnel syndrome?
What 5 anatomical structures are possibly responsible for a compression of this nerve near the elbow? What is the name of this syndrome?
Medial epicondyle, medial intermuscular septum, cubital tunnel, flexor carpi ulnaris muscle, or deep flexor pronator aponeurosis
Cubital tunnel syndrome
What is the origin of the nerve that supplies the skin of the medial 1.5 digits, anteriorly?
Superficial branch of the ulnar nerve
What ventral rami does this nerve originate from?
C5-C7
How many cutaneous nerves are directly derived from the radial nerve? Which one supplies the skin of the posterior arm?
3; posterior brachial cutaneous nerve
What branch of the median nerve innervates the deep layer of muscles in the anterior forearm?
A. Anterior interosseous nerve
B. Palmar cutaneous nerve
C. Recurrent branch
Anterior interosseous nerve
T/F: After passing medial to the most medial carpal bone that lies in the proximal row, the nerve divides into it's 2 terminal branches; superficial and deep.
False; the most medial carpal bone of the proximal row is the pisiform and it passes lateral to it.
What 2 terminal branches of the brachial plexus provide NO cutaneous innervation in the forearm?
Ulnar and Median nerve
Select the correct statement about the musculocutaneous nerve.
It runs distally in the medial compartment of the arm between the biceps brachii and brachialis.
It supplies the skin of the lateral brachium.
It terminates as a completely cutaneous with no muscular innervation in the antebrachium.
After passing medial to the tendons of the biceps brachii and brachialis it gives off it changes name.
3; the LAC is the terminal nerve of the musculocutaneous nerve, with only cutaneous innervation of the lateral forearm.
Select the true statement regarding the radial nerve.
The radial nerve passes through the cubital fossa medial to the brachial artery.
In the posterior compartment of the arm, the radial nerve courses with the profunda brachii artery.
The terminal branch that comes off the superficial branch innervates 8 muscles of the forearm, the skin of the lateral ½ of the dorsum, and the skin of the lateral 3.5 digits, posteriorly.
The branch that becomes the posterior interosseous nerve changes its name at the medial border of the supinator muscle.
2; The radial nerve passes with the profunda brachii artery through the triangular interval and along the radial groove of the humerus.
In the upper arm, what is the course of the median nerve relative to the brachial artery?
Lateral, anterior, lateral
What branch is responsible for the innervation of 14.5 intrinsic hand muscles that contribute to fine motor control?
Deep branch of the ulnar nerve
Select the incorrect statement regarding the cutaneous supply of the upper limb.
The posterior aspect of the lateral dorsum of the hand and proximal portion of the lateral 3.5 digits is supplied by the nerve that originates from the deep branch of the nerve that begins after the axillary nerve is given off.
There are five different branches that supply the hand and none of them originate from the nerve that originates from the lateral cord.
The upper medial arm is supplied by the lateral cutaneous branch of the intercostal nerve T2.
The lateral forearm is supplied by a nerve that once was called the musculocutaneous nerve.
1; The posterior aspect of the lateral dorsum of the hand and proximal portion of the lateral 3.5 digits is supplied by the nerve that originates from the superficial branch of the nerve that begins after the axillary nerve is given off.