Brachial Plexus Flashcards
what innervates forearm in ant. compartment
post compartment?
ulnar and median n.
radial n.
what comes off the upper trunk?
suprascapular n.
nerve to subclavius
SUN
what comes off the lateral cord?
lateral pectoral n.
what comes off the medial cord?
medial pectoral n.
medial brachial cutaneous n.
medial antebrachial cutaneous n.
what comes off the post. cord?
upper subscapular n.
lower subscapular n.
thoracodorsal n. (middle subscapular n.)
what divides the ant. and post. compartments in the ARM?
medial and lateral intermuscular septum
what nerves are affected by injuries to the superior trunk?
C5: axillary
suprascapular
musculocutanous
C6: radial
what is another name for injury to superior trunk injury?
what is the common named presentation?
Erb’s palsy
waiter’s tip
Injuries to the inferior trunk involve which nerves?
what is the common name for this?
median and ulnar
klumpke’s palsy
how do you obtain an injury to the inferior trunk?
avulsion injury from excessive abduction
obstetricly
Horner’s syndrome (T1 preganglionic sympathetic defect)
what spinal nerve roots does injury to radial nerve affect?
C5-T1
how can radial nerve injury occur?
improper use of crutches
humeral fracture at midshaft
Saturday night palsy
Which nerve roots are affected by injury to the axillary nerve?
C5, C6
what are the causes of axillary nerve injury?
fracture to surgical neck of humerus
ant. dislocation of glenohumeral joint
rotator cuff surgery repair
what nerve roots are affected by ulnar nerve injury?
C8, T1, often C7
how does ulnar n. injury occur?
fracture to medial epicondyle of humerus
entrapment in cubital tunnel
rotator cuff surgery repair
what nerve roots are affected in median nerve injury?
C6-T1
causes of median n. root injury?
fracture of humerus ABOVE condyles
entrapment by pronator teres
Carpal Tunnel Syndrome
What nerve injury is the following?
numbness/tingling in 4th and 5th digits
weakening of grip, loss of flexion in fingers
loss of ab/adduction in fingers
Ulnar n.
what nerve injury is the following?
cannot extend wrist or straighten fingers to open the hand
wrist drop
triceps normal
radial n.
what nerve injury is the following?
arm abducted and medially rotated
elbow has pronation and extension
C5, C6 Erb’s palsy
what nerve injury is the following?
numbness in post. deltoid and possible muscle wasting
difficulty abducting and diminished lateral rotation of arm
axillary n.
what nerve injury is the following?
pain and tenderness in ant.-prox.
inability to flex distal IP joint of 1st digit
loss of ab/adduction of fingers
median n.
what n. injury is…?
wrist extended
joints b/w hand and finger bones extended
“claw hand”
median and ulnar nerves
