03-03: Plexus and Nerves

Question 1

Plexus

Answer 1

Group of nerves that ennervate

Question 2

Plexus formation

Answer 2

Anterior rami of spinal nerves join together

Question 3

Posterior (Dorsal) Root - Type

Answer 3

Sensory

Question 4

Anterior (Ventral) Root - Type

Answer 4

Motor

Question 5

Cervical Plexus

Answer 5

C1 - C4 (muscles of neck)

Question 6

Brachial Plexus

Answer 6

C5 - T1 (muscles of upper limb)

- Can be divided into different sections/components

Question 7

Lumbosacral Plexus

Answer 7

L1 - S5 (lower limb)

• L1 - L4 Lumbar portion (thigh muscles)
• L5 - S3 Sacral portion (leg and foot muscles)

Question 8

Brachial Plexus Network

Answer 8

Roots (5-2), Trunks (3-1), Divisions (6), Cords (3-4), Terminal Branches (5)

Question 9

(BPlex) Roots

Answer 9

C5, C6, C7, C8, T1

Dorsal Scapular, Long thoracic

Question 10

(BPlex) Trunks

Answer 10

Superior, Middle, Inferior

Suprascapular

Question 11

(BPlex) Divisions

Answer 11

Anterior (3), Posterior (3)
Anterior divisions - anterior to subclavian artery
Posterior divisions - posterior to subclavian artery

Question 12

(BPlex) Cords

Answer 12

Lateral, Posterior, Medial

Lateral Pectoral, Medial Pectoral, Subscapular, Thoracodorsal

Question 13

(BPlex) Terminal Branches

Answer 13

Musculocutaneous, Axillary, Radial, Median, Ulnar (MARMU)

Question 14

Effect of Shortened Pec Minor

Answer 14

Places pressure on neurovascular bundle

Question 15

Brachial Plexus location

Answer 15

Exits neck under clavicle around coracoid process of scapula; Enters into arm and ennervates muscles on arm