Brachial plexus - Part 3 Flashcards
The ulnar nerve travels deep to the flexor carpi ulnaris, passes __________ to the _________ and then divides into two branches.
Superficial **
Flexor retinaculum**
Once pass the flexor retinaculum, the ulnar nerve divides into which two branches?
Superficial and deep
The superficial branches of the ulnar nerve divides into three terminal branches called what?
Proper palmar branches
The proper palmar branches supply what?
Palmar aspect of the little finger and
Medial half of the ring finger
The deep branch of the ulnar nerve curves towards what in the hand?
Thenar eminence
The deep branch of the ulnar nerve gives off branches in the hand to supply what muscles? (7)
Abductor digiti minimi Flexor digiti minimi brevis Opponent digiti Minami Adjustor policies Deep head of the flexor pollicis brevis All interossei (dorsal and palmar) Lumbricals (3 and 4)
Damage to the ulnar nerve can cause what?
Claw hand (aka ape hand) (atrophy thenar muscles too)
Claw hand involves all digits. Why?
Because ulnar innervates ALL interossei muscles
What are the five possible crush injuries sites?
IVF Scalene triangle Brachial plexus Posterior medial epicondyle (elbow) Flexor retinaculum
The median nerve contains fibers from what two cords?
Medial and lateral cords
The median nerve contains fibers from what nerves?
C6, C7, C8, and T1
Does the median nerve give off branches in the arm?
No
The median nerve travels through the arm in what?
Medial bicipital sulcus
The median nerve crosses the elbow on which side?
Anterior side
The median nerve enters the forearm after passing through what?
Two heads of the pronator teres
The median nerve innervates what muscles of the forearm?
Pronator teres
Flexor carpi radialis
Palmaris longus
Flexor digitorum superficialis
The other three muscles of the forearm that the median nerve innervates is by way of what nerve? Given off where?
Anterior interosseous nerve of the forearm
At the elbow
What muscles does the anterior interosseous nerve of the forearm supply?
Pronator quadratus
Flexor pollicis longus
Lateral bellies of flexor digitorum profundus
What branch of the median nerve is given off in the distal third of the forearm?
Palmar branch of the median nerve
The palmar branch of the median nerve supplies what?
Skin of the thenar eminence, lateral wrist, and palm
The median nerve passes through what near the wrist?
Carpal tunnel
After passing through the carpal tunnel, the median nerve divides into what?
Common palmar digital nerves
The common palmar digital nerves supply what?
1st two lumbricals
The 1st common palmer digital nerve supplies what?
(thenar muscles)
Abductor pollicis brevis
Flexor pollicis brevis - superficial head
Opponent pollicis
Each common palmar digital nerve splits into what?
Proper palmar digital nerves
Are the proper palmar digital nerves motor or sensory?
sensory
The proper palmar digital nerves supply what?
Skin over lateral three and a half digits
The median nerve also supplies what that is loaded with nociceptors?
periosteum
What is the articular supply of the median nerve?
Elbow, radiocarpal, and midcarpal joints
The median nerve usually communicates with which nerve at the wrist?
Ulnar nerve
What are some things that can happen with damage to the median nerve?
hand of oath/benediction
Carpal tunnel syndrome
Unable to pronate
Why would the median nerve make you unable to pronate?
Because it innervates the pronator teres and pronator quadratus
Carpal tunnel syndrome is entrapment where?
Flexor retinaculum and carpal bones
What is the “hand of oath/benediction”?
Try to make a fist but cannot close 4th and 5th digits
What nerves/branches come off of the posterior cord? 5
Superior subscapular nerve thoracodorsal nerve Inferior subscapular nerve axillary nerve Radial nerve
What is the largest nerve coming off of the posterior cords?
Radial nerve
The superior subscapular nerve contains fibers from what?
C5 and C6
The superior subscapular nerve supplies what muscle
subscapularis (a rotator cuff)
The thoracodorsal nerve contains fibers from what nerve?
C6, C7, and C8
The thoracodorsal nerve travels along what? To supply what muscle?
Posterior axillary wall
latissimus dorsi
