Brachial Plexus

Question 1

What separates the anterior and posterior compartments of upper limb?

Answer 1

medial and lateral intermuscular septa

Question 2

Anterior compartment muscles and nerve

Answer 2

Biceps brachii and brachialis

-nerve is musculocutaneous N (flexors of the elbow joint)

Question 3

posterior compartment

Answer 3

radial nerve, extensors of elbow

Question 4

Superior trunk injury C5 and C6

C5 spinal nerve: what branches

Answer 4

Suprascapular nerve: weakness in spinatous muscles

Axillary nerve (weak deltoid and teres minor)

musculocutaneous nerve: weakness in biceps

Question 5

c5 and c6 injury

-c6 spinal root

Answer 5

Radial nerve: weakness ni brachioradialis and supinator

Question 6

Injuries to inferior trunk C8 T1

• name
• syndrome associated
• clinical presentation
• nerves involved and how it looks

Answer 6

• klumpke’s palsy
• horners syndrome: ptosis of the eye with T1 sympathetic ganglia
• median and ulnar nerves are injured
• extended wrist extended MP, flexed PIP and DIP
• claw hand

Question 7

injuries to the radial nerve 
in the axillary region
(what to what)
-from what action
-clinical presentation

Answer 7

• C5-T1
• crutches
• wrist drop, can’t extend wrist or fingers and push things away

Question 8

Injuries to radial nerve in the spiral groove of the humerus
-name
and cause
-clinical presentation

Answer 8

C5-T1 
sleep palsy, saturday night palsy
-fracture at midshaft
-wrist drop finger drop 
-triceps retain strength becasue nerve fibers entering this muscle branch off proximal to midshaft of humerus

Question 9

injuries to axillary nerve

• what root to what root
• casuse
• presentation

Answer 9

C5,C6

• fracture surgical neck of humerus
• anterior discloation of GH joint

presentation

• decresed abduction and lateral rotation of arm
• wasting deltoid muscle
• numbness in posterior deltoid region

Question 10

injury to long thoracic nerve

Answer 10

cant raise arm past 90 degrees
winged scapula
c5,6,7

Question 11

injury to ulnar nerve

• roots
• cause
• presentation

Answer 11

-C8,T1
-fracture medial epicondyle of humerus
-numbness in 4th and 5th fingers
-loss flexion of fingers
loss abduction and adduction of fingers

Question 12

injuries to the median nerve

• roots
• cause
• presentation

Answer 12

-C6-T1
-fracture of humerus above condryles,
entrapment of nerve by pronator teres

• pain and tenderness in anterior proximal forearm
• decresed sensation along course of median nerve
• hand of benedictation
• ape hand
• loss ab and adduction of fingers