Exam 3 - The Extensor Forearm and Hand Flashcards
What two muscles are innervated by deep branch of radial nerve?
Extensor carpi radialis brevis and supinator
Note: All extensors innervated by radial nerve
The long flexor tendons to the medial four digits pass through the tunnel accompanied by what nerve?
The median nerve
Tennis elbow occurs after heavy exertion involving forceful supination and pronation of the forearm. What tendon is inflamed in this condition?
Common extensor tendon
What is the function and innervation of the brachioradialis muscle?
The brachioradialis flexes the forearm and is innervation by the radial nerve.
A child sustains a fracture of the humerus just above the condyles. She cannot extend the metacarpophalangeal joints of her fingers or oppose her thumb to the other fingers. What nerve(s) may she have injured?
Radial and median nerves
Inability to supinate the forearm means what nerve is affected?
Deep branch of radial nerve
A patient can no longer adduct the thumb or abduct the little finger. What nerve is involved?
The deep branch of the ulnar nerve
What nerve is responsible for extension of the interphalangeal joints via the lumbrical muscles?
1st and 2nd lumbricals: median nerve.
3rd and 4th lumbricals: ulnar nerve.
The brachioradialis muscle is the only flexor innervated by what nerve?
Radial nerve
The radial nerve descends on the arm between what two muscles?
Brachialis and brachioradialis
“Tennis elbow” or the pain on the lateral aspect of the elbow, radiates down the lateral forearm and dorsal hand. This is caused by inflammation of what?
The Common Extensor tendon
Note: “Golfer’s elbow” is a similar pain caused by inflammation of the common flexor tendon
The carpal groove is converted into the carpal tunnel by what structure?
Flexor retinaculum
Which muscle has tendons found in two tiers within the carpal tunnel?
Flexor digitorum superficialis (3, 4 superficial; 2, 5 deep)
Which muscles in the hand are innervated by the medial nerve?
All thenars (flexor pollicis brevis muscle, abductor pollicis brevis muscle, opponens pollicus muscle) and the 1st and 2nd lumbrical muscles
Which muscles adduct the fingers?
Palmar interosseous muscles
Which muscles abduct the fingers?
Dorsal interosseous muscles
The ulnar artery supplies branches to all sides of the fingers except what two exceptions?
a. Thumb
b. Radial side of index finger
The main trunk of the ulnar artery continues as the ______ palmar arch.
Superficial
The main trunk of the radial artery continues as the ______ palmar arch.
Deep
What enters the hand lateral to the ulnar nerve and superficial to the flexor retinaculum?
Ulnar artery
What artery passes through the anatomical snuff box?
Radial artery
What nerve is largely responsible for cutaneous supply of the palm?
Median nerve
What is the floor of the cubital fossa? (2 muscles)
Brachialis
Supinator
Cell bodies of skeletal motor (GSE) fibers are found where?
Anterior horn of spinal cord
