Brachial Plexus; Mod 3

Front 1

Name the 4 spinal nerve plexuses

Back 1

Cervical C1-C4
Brachial - C5-T1
Lumbar- L1-L4
Sacral - L4-S4

Front 2

1) What does the brachial plexus innervate?
2) How is it formed?

Back 2

1) innervation of entire upper extremity
2) formed by ventral rami of C5, C6, C7, C8, and T1.
- results in individual nerves carrying fibers from SEVERAL spinal cord levels

Front 3

1) what do posterior roots of spinal nerves do?
2) Anterior roots?

Back 3

1) sensory
2) motor

Both of them mix to form a spinal nerve

Front 4

What does each spinal nerve gives rise to?

Back 4

Anterior and posterior Rami

Dorsal ramus: to deep back muscles/skin
Ventral ramus: to trunk/limbs

Front 5

Describe the branching pattern of the brachial plexus

Back 5

Roots - from spinal nerves (ventral rami)
Trunks (+)
-combination of roots: superior, middle, inferior
Divisions (-)
-Each trunks divides into anterior and posterior divisions
Cords (+)
-formed by combo of divisions: medial, lateral, posterior

Branches (terminal) (-)
2 nerves form from each cords: musculocutaneious, median (from 2 cords), ulnar, radial, and axillary

Randy Travis Drinks Cold Beer

Front 6

What marker divides the brachial plexus?

Back 6

Clavicle. some of the brachial plexus is above it, some below it.
Below clavicle, trunk breaks apart into divisions..

Front 7

make sure you know how to

Back 7

Describe all the pathways of the brachial plexus

Front 8

Name the supraclavicular branches.

Back 8

Come off roots or trunks
1. dorsal scapuar nerve (C5)
2. long thoracic nerve (C5-7)
3. suprascapular nerve (C5,6)
4. Nerve to subclavius (C5, 6)

Front 9

Name the infraclavicular branches

Back 9

come off CORDS
Lateral cord - lateral pectoral n.

Medial cord
-medial pectoral nerve
-medial brachial cut n.
-med. antebrach cut n

Posterior cord
-upper subscapular
lower subscapular
-thoracodorsal n

Front 10

What are the 3 branches off the posterior cord?

Back 10

1. upper subscapular (C5,C6)
2. thoracodorsal (C6-C8)
3. lower subscapular (C5,C6)

Front 11

3 branches off the medial occords

Back 11

1. medial pectoral C8-T1
2. medial brachial cutaneous (C8-T1
3. medial antebrachial cutananeous (C8, T11)

Front 12

What nerves are only sensory?

Back 12

Medial brachial cutaneous and medial antebrachial cutaneous

Front 13

1) Nerve of the anterior compartment of arm is...
2) Nerve of anterior compartment of forearm?
3) Both posterior compartments of arm and forearm..

Back 13

1) muscolocuatenous nerve
2) median or ulnar
(both motor)
3) Radial nerve