Brachial Plexus

Question 1

Dorsal Scapular

Answer 1

Course: Middle scalene –> levator scapulae and rhomboids
Innervates: Rhomboids

Question 2

Long Thoracic

Answer 2

Course: Runs on surface of serratus anterior
Innervates: Serratus anterior

Question 3

Suprascapular

Answer 3

Course: Runs on dorsal surface of scapula
Innervates:
-Supraspinatus
-Infraspinatus
-Glenohumeral joint

Question 4

Subclavian

Answer 4

Course: Runs to subclavius muscle
Innervates:
-Subclavius
-Sternoclavicular joint

Question 5

Lateral pectoral

Answer 5

Course: Runs around front of rib cage
Innervates: Primarily pec major (some pec minor)

Question 6

Musculocutaneous

Answer 6

Course: Wraps around anterior of arm, runs down lateral (thumb) side of forearm
Innervates:
-Muscles of ant arm compartment
-Skin of lateral aspect of forearm

Question 7

Median

Answer 7

Course: Medial aspect of arm, crosses to middle of forearm
Innervates:
-Muscles of ant forearm compartment
-Muscles of thenar half of palm and palmar skin
(does nothing in arm)

Question 8

Medial pectoral

Answer 8

Course: Runs around front of rib cage
Innervates: Pec major AND minor

Question 9

Medial cutaneous nerve of arm

Answer 9

Course: Runs half-way down arm
Innervates: Skin of medial side of arm as far as medial epicondyle

Question 10

Medial cutaneous nerve of forearm

Answer 10

Course: Runs medial down arm, crosses to middle in forearm
Innervates: skin on medial side of forearm

Question 11

Ulnar

Answer 11

Course: Medial side of arm –> medial epicondyle –> medial side of forearm
Innervates:
-Flexor carpi ulnaris
-Ulnar half of flexor digitorum profundus (forearm)
-Intrinsic hand muscles

Question 12

Upper subscapular

Answer 12

Course: Runs over subscapularis (more medial to lower subscapular)
Innervates: Superior portion of subscapularis

Question 13

Lower subscapular

Answer 13

Course: Runs over subscapularis (more lateral to upper subscapular)
Innervates:
-Inferior portion of subscapularis
-Teres major

Question 14

Thoracordorsal

Answer 14

Course: Runs over back of rib cage
Innervates: Latissimus dorsi

Question 15

Axillary

Answer 15

Course: Runs around shoulder joint
Innervates: 
-Glenohumeral joint
-Teres minor
-Deltoid muscles
-Skin over deltoid muscle

Question 16

Radial

Answer 16

Course: Runs around back of arm, wraps around to front of arm at lateral epicondyle
-Splits into deep and superficial branches which run down the lateral side of the forearm
Innervates:
-Muscles of post compartments of ARM and FOREARM
-Posterior skin of arm, forearm, and hand