Revision for written test: Brachial plexus

Question 1

N. Suprascapularis
1. What direction does it run? How would you “describe” the location
2. Supplies what?

Answer 1

1. Runs caudolaterally
2. Supplies M. supraspinatus & infraspinatus

Question 2

N. Subscapularis
1. What direction does it run? How would you “describe” the location
2. Supplies what?

Answer 2

1. 2-4 weak branches from cranial part of plexus
2. Supplies m. subscapularis

Question 3

N. Musculocutaneus
1. What direction does it run? How would you “describe” the location
2. Supplies what?
3. Forms what structure?
4. Branches?

Answer 3

1. Runs parallel to n. medianus
2. M. coracobrachialis, brachialis & biceps brachii
3. Ansa axillaris w/ n. axillaris around a. axillaris
4. N. cutaneus antebrachii medialis

Question 4

Nn. Pectorales craniales
1. What direction does it run? How would you “describe” the location
2. Supplies what?

Answer 4

1. 3-5 small branches, pass w/ a. circumflexa humeri cranialis
2. Supply m. pectoralis superficialis (descendens et transversus) & m. subclavius (un)

Question 5

N. Pectorales caudales
1. What direction does it run? How would you “describe” the location
2. Supplies what?

Answer 5

1. Runs caudoventrally
2. M. pectoralis profundus & m. cutaneus trunci

Question 6

N. Thoracicus longus
1. What direction does it run? How would you “describe” the location
2. Supplies what?

Answer 6

1. Passes horizontally
   2.Supplies m. serratus ventralis thoracis

Question 7

N. Thoracodorsalis
1. What direction does it run? How would you “describe” the location
2. Supplies what?

Answer 7

1. Passes caudally
2. Supplies m. latissimus dorsi

Question 8

N. thoracicus lateralis
1. Supplies what?

Answer 8

1. Lateral aspect of thoracic & abdominal region (m. cutaneus trunci).
   Some fibres join w/ intercostal nerves

Question 9

N. Axillaris
1. What direction does it run? How would you “describe” the location
2. Supplies what?
3. Where does it divide and into what?

Answer 9

1. Passes caudolaterally
2. Supplies m. teres major et minor, subscapularis & deltoideus
3. Divides under m. deltoideus into: N. cutaneus antebrachii cranialis

Question 10

N. Radialis
1. What direction does it run? How would you “describe” the location
2. Supplies what?
3. Divides into what?

Answer 10

1. Passes w/ a. brachialis profundus
2. Supplies m. triceps brachii, anconeus, tensor fasciae antebrachii & extensors of forearm
3. N. cutaneus antebrachii
   lateralis
   >Nn. digitales dorsales communes

Question 11

N. Medianus
1. What direction does it run? How would you “describe” the location
2. Supplies what?
3. What happens in cat?
4. Divides into what?

Answer 11

1. Passes w/ brachial & median a.
2. Supplies deep & superficial digital flexors, m. pronator teres, pronator quadratus & skin on palmar aspect
3. In fe, passes through supracondylar foramen w/ a. brachialis
4. At carpal joint divides into Nn. digitales palmares communes 1-3
   ( in car,) into n. digitalis palmaris 1 abaxialis

Question 12

N. Ulnaris
1. What direction does it run? How would you “describe” the location
2. Supplies what?
3. Divides into?

Answer 12

1. Runs caudal to median nerve w/ a. collateralis ulnaris
2. Supplies flexor muscles & part of skin of forearm & lateral side of manus
3. Ramus dorsalis, N. cutaneus antebrachii caudalis + Ramus palmaris, which divides further into N. digitalis palmaris communis 4