Brachial Plexus

Question 1

what innervates forearm in ant. compartment

post compartment?

Answer 1

ulnar and median n.

radial n.

Question 2

what comes off the upper trunk?

Answer 2

suprascapular n.
nerve to subclavius

SUN

Question 3

what comes off the lateral cord?

Answer 3

lateral pectoral n.

Question 4

what comes off the medial cord?

Answer 4

medial pectoral n.
medial brachial cutaneous n.
medial antebrachial cutaneous n.

Question 5

what comes off the post. cord?

Answer 5

upper subscapular n.
lower subscapular n.
thoracodorsal n. (middle subscapular n.)

Question 6

what divides the ant. and post. compartments in the ARM?

Answer 6

medial and lateral intermuscular septum

Question 7

what nerves are affected by injuries to the superior trunk?

Answer 7

C5: axillary
suprascapular
musculocutanous

C6: radial

Question 8

what is another name for injury to superior trunk injury?

what is the common named presentation?

Answer 8

Erb’s palsy

waiter’s tip

Question 9

Injuries to the inferior trunk involve which nerves?

what is the common name for this?

Answer 9

median and ulnar

klumpke’s palsy

Question 10

how do you obtain an injury to the inferior trunk?

Answer 10

avulsion injury from excessive abduction
obstetricly
Horner’s syndrome (T1 preganglionic sympathetic defect)

Question 11

what spinal nerve roots does injury to radial nerve affect?

Answer 11

C5-T1

Question 12

how can radial nerve injury occur?

Answer 12

improper use of crutches
humeral fracture at midshaft
Saturday night palsy

Question 13

Which nerve roots are affected by injury to the axillary nerve?

Answer 13

C5, C6

Question 14

what are the causes of axillary nerve injury?

Answer 14

fracture to surgical neck of humerus
ant. dislocation of glenohumeral joint
rotator cuff surgery repair

Question 15

what nerve roots are affected by ulnar nerve injury?

Answer 15

C8, T1, often C7

Question 16

how does ulnar n. injury occur?

Answer 16

fracture to medial epicondyle of humerus
entrapment in cubital tunnel
rotator cuff surgery repair

Question 17

what nerve roots are affected in median nerve injury?

Answer 17

C6-T1

Question 18

causes of median n. root injury?

Answer 18

fracture of humerus ABOVE condyles
entrapment by pronator teres
Carpal Tunnel Syndrome

Question 19

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

Answer 19

Ulnar n.

Question 20

what nerve injury is the following?
cannot extend wrist or straighten fingers to open the hand
wrist drop
triceps normal

Answer 20

radial n.

Question 21

what nerve injury is the following?
arm abducted and medially rotated
elbow has pronation and extension

Answer 21

C5, C6 Erb’s palsy

Question 22

what nerve injury is the following?
numbness in post. deltoid and possible muscle wasting
difficulty abducting and diminished lateral rotation of arm

Answer 22

axillary n.

Question 23

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

Answer 23

median n.

Question 24

what n. injury is…?
wrist extended
joints b/w hand and finger bones extended
“claw hand”

Answer 24

median and ulnar nerves

Question 25

what is associated with “Ape’s hand” and “Hand of Benedication”?

Answer 25

median n. injury

Question 26

what n. injury is the following due to improper use of crutches?
weakness when trying to push something away
difficulty extending wrist and opening hand?

Answer 26

radial n.

wrist drop

Question 27

In the arm what innervates ant compartment?

post compartment?

Answer 27

musculocutaneous

radial