Flashcards in Hand - Neurovascular Deck (17)
What are the four branches of the deep branch of the radial artery before it becomes the deep palmar arch?
1) Dorsal carpal branch
2) Dorsal scaphoid branch
3) Princeps pollicis
4) Radialis indicis
What muscle does the superficial branch of the radial artery course volarly over or through?
Abductor pollicis brevis (APB)
In the hand, which arteries form the anatamosis between the superficial palmar arch & the deep palmar arch?
Palmar metacarpal arteries of the deep arch & the common digital arteries of the superficial arch
What are the two branches of the superficial branch of the radial artery?
1) Palmar carpal branch
2) Palmar scaphoid branch
Where does the Superficial Branch of the Radial Nerve (SBRN) emerge in the forearm?
Between the brachioradialis & extensor carpi radialis longus (ECRL) , 9cm proximal to the radial styloid
What are the borders of the carpal tunnel?
- Radial = Scaphoid tubercle & trapezium
- Ulnar = Hook of the Hamate & Pisiform
- Roof = TCL
- Floor = Proximal carpal row
Where is the median nerve typically positioned in the carpal tunnel?
1) Radial 60%
2) Central 22%
3) Volar-radial 18%
What are the three common branching patterns of the Recurrent Branch of the Median Nerve (RBMN)?
1) 50% after the carpal tunnel
2) 30% under the TCL
3) 20 % through the TCL
What muscles are supplied by the RBMN?
1) Flexor Pollicis Brevis
2) Abductor Pollicis Brevis
3) Opponens Pollicis
4) Radial x2 lumbrcials
What does the palmar cutaneous branch of the ulnar nerve innervate?
1) Ulnar palmar skin of the hand
2) Palmaris brevis muscle
What are the borders of Guyon's Canal?
Ulnar = Pisiform, Pisohamate ligament, abductor digiti minimi muscle belly
Radial = Hook of the Hamate
Roof = Palmar Carpal Ligament
Floor = Transverse Carpal Ligament
What muscles are innervated by the deep motor branch of the ulnar nerve?
1) Adductor pollicis
2) Deep head of the FBP
3) Dorsal/palmar interossesi
4) Lumbricals III & IV
5) Hypothenar muscles
- Abductor digiti minimi
- Flexor digiti minimi brevis
- Opponens digiti minimi
What are the three zones of ulnar nerve compression at Guyon's Canal?
Zone 1 = Proximal to bifurcation
Zone 2= Deep motor branch
Zone 3 = Superficial sensory branch
What are the most common causes of a Zone I ulnar nerve lesion?
2) Hook of the Hamate fx
What are the most common causes of a Zone II ulnar nerve lesion?
1) Ganglia from the triquetrohamate joint
2) Hamate fx
What is the most common cause of a Zone III ulnar nerve lesion?
Ulnar arterial thrombosis