Brachial Plexus

Question 1

Where do the ventral rami of C5-T1 exit?

Answer 1

between scalenus medius and anterior

Question 2

What are the direct branches from the rami?

Answer 2

Dorsal scapular nerve (C5) to rhomboid muscles

Long Thoracic Nerve (C5-C7) to serratus anterior

Question 3

Trunks of the brachial plexus?

Answer 3

Superior formed from C5 and C6
Middle formed from C7
Inferior formed from C8 and T1

Question 4

Suprascapular nerve?

Answer 4

C5 and C6 innervates supraspinatus and infraspinatus

Question 5

What branches make up the subclavius nerve?

Answer 5

C5, C6 from the superior trunk

Question 6

Anterior division?

Answer 6

Carries fibers from the tunks of anterior compartments to upper extremity. Comes from lateral and medial cords

Question 7

Posterior division?

Answer 7

Carries fibers from the tunks of posteiror compartments to upper extremity. Comes from posterior cord.

Question 8

Cords?

Answer 8

Named for relationship to axillary artery
Lateral cord made from anterior divisions of the upper and middle trunks
Posterior cords come from all trunks
Medial cords come from the anterior division of lower turnk

Question 9

Direct branches off of the lateral cord?

Answer 9

Lateral pectoral nerve (C5-7) innervates clavicular head of pectoralis major

Question 10

Terminal nerve off of lateral cord?

Answer 10

Musculocutaneous (C5-C7) innervates biceps brachii, brachialis, and coracobrachialis

Question 11

Direct branches off of the medial cord?

Answer 11

Medial pectoral nerve (C8-T1) innervates sternal head of pectoralis major muscle and minor.
Medial Cutaneous nerve to brachium
Medial Cutaneous nerve to antebrachium

Question 12

Terminal branches off of medial cord?

Answer 12

Ulnar nerve (C8-T1) innervates flexor dig frof, flex carp uln, palm brev, abd dig min
Medial root of median nerve (C8-T1)  innervates pronater teres, flex carp rad, flex dig sup, flexor pol long and brev

Question 13

Posterior cord direct branches?

Answer 13

Upper subscapular nerve ( C5, sometimes 6) innervates subscapularis
Thoracodorsal (C6-C7) to lats
Lower subscapular nerve (C6, sometimes 5) to subscapularis and teres major

Question 14

Terminal branches of the posterior cord?

Answer 14

Axillary (C5-6) to deltoid and teres minor, sensory on arm over deltoid
Radial (C5-T1) posterior compartments of arm and forearm, also brachioradialis
Sensory to back of arm forearm and hand