UE Neurology Flashcards
what 2 nerves have all 5 anterior rami in them?
radial nerve and median nerve
what 3 nerves come off the “M” in the brachial plexus?
musculocutaneous nerve, median nerve, ulnar nerve
which cord(s) supplies teres minor?
posterior
which cord(s) supplies teres major?
posterior
which cord(s) supplies pectoralis major?
lateral and medial
what nerve supplies the superior lateral arm skin? which cord is it from?
superior lateral brachial cutaneous nerve
Posterior Cord
which muscle does not require innervation by C7 anterior rami?
A. pectoralis major m.
B. teres major m.
C. coracobrachialis m.
D. latissimus dorsi m.
B. teres major m. (only C5 and C6)
which muscle does not require innervation by C8 anterior rami? A. latissimus dorsi B. pectoralis major C. pectoralis minor D. subscapularis
D. subscapularis (only C5 and C6)
what is the ligament that the suprascapular nerve goes under?
transverse scapular l.
which anterior rami supply serratous anterior m? what nerve do they make?
C5-C7, long thoracic N
which nerve supplies the medial arm skin? what anterior rami are in it?
medial brachial cutaneous nerve, C8 and T1
which anterior rami supply the skin of the lateral forearm? what nerve is this?
C5 and C6, lateral antebrachial cutaneous nerve
what are the 5 terminal branches?
musculocutaneous N, axillary N, radian N, median N, ulnar N
what muscle does the deep radial artery supply when it changes its name? what is the name change?
supinator, posterior interosseous nerve
flexor pollicis brevis is innervated by?
1/2 deep ulnar nerve, 1/2 recurrent branch of median nerve
damage to C3 and C4 results in damage to where? what nerve supplies this skin?
skin, neck, shoulder
supraclavicular N
what anterior rami make up the thoracodorsal nerve?
C6, C7, C8
the superficial ulnar N becomes what nerves in the fingers?
common palmar digital nerve, proper palmer digital nerve
what nerve(s) turns into the proper and common palmar digital nerve?
median nerve and superficial ulnar nerve
brachial plexus is divided into?
roots, trunks, divisions, cords, terminal branches
cutting the superior trunk of the brachial plexus results in weakening of what muscles(s) and paralysis of what muscle(s)?
weakening: pectoralis major m., biceps brachii m., brachialis m., coracobrachialis m.
paralysis: none bc medial pectoral nerve innervates pectoralis major m. too, and the other muscles are innervated by the C7 anterior rami as well
deltoid m. does not need which anterior rami?
A. C6
B. C7
C. C5
B. C7
pt comes in complaining that their aconeus m. has weakened. What cord do you suspect there is an issue in?
posterior cord
pt has a problem rotating their glenoid cavity upwards and protracting their scapula. which anterior rami do you suspect is affected?
A. C5
B. T1
C. C8
what artery runs next to the affected nerve?
A. C5
lateral thoracic artery bc the serratous anterior muscle is affected.
Pt presents in a “Waiters tip position”. After examining him you determine he damaged C6/C5 anterior rami. What are his motor deficits? What part of the plexus is injured?
Deficits :adduction, medial rotation, extended elbow
Superior Plexus Injury
Pt presents with Klumpke paralysis. Which nerve root is affected ?
T1 and C8 for ulnar nerve
This condition is also known as claw hand . IN this case Ulnar N. is damaged and therefore INFERIOR plexus injury
Pt has weakened flexion, extension and abduction of the humerus. What part of the brachial plexus is damaged?
Posterior Cord : Axillary N.
Pt presents with his lack of flexion in his index finger and middle finger. What nerve of the brachial plexus is injured? What part of the arm is injured
lateral and medial cord: Median N.
THINK:
“ hand of benediction”
Injury to medial nerve in elbow
Pt comes in with weekened bicep reflex. What part of the brachial plexus is injured ?
Lateral Cord affecting Musculocutaneous N.
Patient presents with wrist drop. What nerve is affected? What cord is it derived from?
Radial, Posterior Cord
In a physical exam, a provider found a weakness of the patient’s right wrist with poor finger flexion, pronation, and thumb opposition, resembling the “ape hand.” On which nerve of the brachial plexus does the lesion lie?
a. Median
b. Axillary
c. Ulnar
d. Radial
A. Median
The nerves which innervate the muscles and skin of the thumb are derived from the brachial plexus via its:
A. Medial and lateral cord
B. Posterior cord
C. Medial cord
D. Medial, lateral and posterior
D. medial, lateral, and posterior (radial nerve and median nerve)
He says that kids at school make fun of him because his back does “something weird.” You take a look and note that he is experiencing scapular winging. What spinal nerves are associated with this young man’s problem?
a. C8 and C7
b. T1, C6, C5
c. C7, C6, T1
d. C5, C6, C7
C5, C6, C7
A pt comes into your office looking a bit embarrassed. He is unable to wipe his butt when using the toilet. What nerve is associated with his problem?
a. Suprascapular
b. Radial
c. Ulnar
d. Thoracodorsal
e. Median
D.
Which of these nerves has been injured if the patient cannot abduct their arm?
Radial N.
Axillary N.
Ulnar N.
Sciatic N.
Axillary N.
Patient presents with claw hand. What nerve has been affected?
a. Radial
b. Ulnar
c. Long thoracic N
d. Median N.
Ulnar N.
Which nerves make up the median N.?
C5,6,7,8 and T1
Injury to the middle trunk of the brachial plexus would affect what muscles?
Latissimus dorsi M.
Pectoralis major m
Coracobrachialis
Etc
What nerves form the superior trunk of the brachial plexus?
C5 and C6
Which nerves would be damaged if the lateral cord was severed?
Musculocutaneous N.
lateral antebrachial cutaneous nerve
Lateral Pectoral N.
The median nerve innervates most muscles of the anterior compartment, except :
- flexor carpi ulnaris
2. medial part of the flexor digitorum profundus.
