Unit Two Nerves Of Hand Flashcards
What two nerves supply the hand
Median and ulnar nerve
Does the radial nerve supply the muscles in the hand
No but does have sensory distribution in the hand
The palmar cutaneous branch of the median nerve separates where
Prior to the carpal tunnel and passes over the flexor retinaculum
Palmar cutaneous branch supplies what
Midpalmar surface
What supplies the palmar surfaces of digits 1-3 and lateral half of the 4th, and the dorsum of the distal half of digits 1-4
Sensory branch of median nerve
The ulnar nerve runs distally in the forearm under what muscle
Flexor carpi ulnaris
The ulnar nerve enters the wrist via
Ulnar canal
Does the palmar cutaneous branch of the ulnar nerve pass through the flexor retinaculum
No, it passes superficial
The dorsal cutaneous branch of ulnar nerve supplies what
Medial half of dorsum of hand and the 5th finger and medial half of the 4th digit
The palmar cutaneous branch of the ulnar nerve supplies what
Proximal hypothenar eminence
The superficial branch of the ulnar supplies what
Anterior surface of the 4th and 5th digits
The deep branch of the ulnar nerve supplies what
Hypothenar muscles, the interossei, lumbricals of 4th and 5th digits and the adductor pollicis and deep head of flexor pollicis brevis, local joints
The ulnar nerve is known as
The nerve of the fine finger movements
The radial nerves supplies what of the hand
Skin over the lateral 2/3rds of the dorsum of the hand, thumb and proximal lateral 1.5 digits
What is the primary and initial complaint of carpal tunnel syndrome
Paresthesias
When does carpal tunnel syndrome act the worse
At night but relieved by hand movement
What is an indication of chronic compression of carpal tunnel syndrome
Thenar waisting
What other symptoms contribute to carpal tunnel syndrome
Hypothyroidism, osteoarthritis, diabetes, wrist trauma, pregnancy, hypothyroidism, acromegaly, tumor (lipoma, ganglion cyst, synovial cyst)
What are some irritating or inflammation (sensory nerves) symptoms of carpal tunnel syndrome
Pain and paresthesisas
What some ablative symptoms of carpal tunnel syndrome
Numbness/ anesthesia and weakness/atrophy
What are some worsening symptoms of carpal tunnel syndrome
Decrease sensation at the volar pads of the thumb and index finger due to compression of median nerves
What muscle is not completely affected by median nerve during carpal tunnel syndrome
Flexor pollicis brevis
Aka of ulnar nerve compression
Guyons canal syndrome
What causes guyons canal syndrome
Entrapment of the ulnar nerve in the guyon canal as passes through the wrist
Symptoms of guyons canal syndrome
Begins with paresthesias in ring and pinky, follow by decreased sensation and eventually weakness and clumsiness in the hand as the small muscles of the hand are involved
If the ulnar nerve is compressed at the wrist, what happens to the sensation of the dorsum of the hand
Normal sensation
How many zones in guyons canal
Three
If there is a lesion in zone 1 of guyons canal what occurs
Motor and sensory symptoms
Lesion in zone 2 of guyons canal
Motor deficits
Lesions in zone 3 of guyons canal
Sensory deficits
What ligaments are affected in guyons canal syndrome
Pisohamate ligament, trans carpal ligament, volar carpal ligament
What syndrome is common in road cyclists
Handlebar palsy, ulnar nerve compression
