The Brachial Plexus

Question 0

Origin

Answer 0

Formed by union of ventral rami of:

C5-C8 & greater part of T1

Question 1

Definition

Answer 1

• Major nerve network
• Begins in neck
• Extends into axilla

Question 2

General function

Answer 2

Motor & sensory innervation of upper limb

Question 3

Location

Answer 3

• Neck
• Clavicular regions
• Axilla

Question 4

Trunks

Answer 4

Union of roots gives rise to

1. Sup. trunk
2. Mid. trunk
3. Inf. trunk

Question 5

Divisions

Answer 5

• Each trunk divides into ant. & post. divisions
• Ant. divisions innervate ant. (flexor) compartments of upper limb
• Post. divisions innervate post. (extensor) compartments of upper limb
• Ant. divisions: superior, middle, inferior
• Post. divisions: superior, middle, inferior

Question 6

Cords

Answer 6

• Divisions from 3 cords:
  1. Lateral cord: formed by ant. divisions of sup. & mid. trunks
  2. Medial cord: formed by ant. division of inf. trunk
  3. Post. cord: formed by post. divisions of sup, mid. & inf. trunks

Question 7

Terminal branches

Answer 7

• Medial n.
• Musculocutaneous n.
• Axillary n.
• Radial n.
• Ulnar n.