Brachial plexus

Question 1

Which nerves create the brachial plexus?

Answer 1

C5-C8 and T1

Question 2

Ordering of the sectioning of the brachial plexus

Answer 2

Roots, trunks, divisions, cords, branches

Question 3

How many roots in the brachial plexus?

Answer 3

5

Question 4

How many trunks are in the brachial plexus?

Answer 4

3

Question 5

How many divisions are in the brachial plexus?

Answer 5

6

Question 6

How many cords are in the brachial plexus?

Answer 6

3

Question 7

How many branches are in the brachial plexus?

Answer 7

5

Question 8

Long thoracic nerve

Answer 8

Comes off a root. Travels anterior to the anterior scalene, between the clavicle and rib 1. Innervates the serratus anterior.

Question 9

Suprascapular nerve

Answer 9

Comes off a trunk, travels between the posterior scalene and the upper trapezius. Travels to the scapula and innervated supra and infra spinatus

Question 10

Medial pectoral nerve

Answer 10

Comes off a cord, travels between the pec minor and major. Innervates both pectoralis muscles.

Question 11

Lateral pectoral nerve

Answer 11

Comes off a cord and travels between the pectoralis muscles. Innervates the pec major.

Question 12

Subscapular nerve

Answer 12

Comes off of a cord. Splits int superior and inferior subscapular and thoracodorsal nerves.

Question 13

Muscles innervated by superior subscapular nerve

Answer 13

Subscapularis

Question 14

Muscles innervated by the thoracodorsal nerve

Answer 14

Latissimus dorsi

Question 15

Muscles innervated by the inferior subscapular nerve

Answer 15

Teres major

Question 16

Dorsal scapular nerve

Answer 16

Originates from C5, passes posterior to the middle scalene, then travels along the border of the scapula. Innervates the levator scapula and the rhomboids

Question 17

Nerve to subclavius

Answer 17

Originates from a superior trunk. Passes antero-inferior over subclavian artery and vein. Innervates the subclavius

Question 18

Accessory nerve (CN XI)

Answer 18

Not a part of the brachial plexus. Descends from the neck to the SCM and trapezius.

Question 19

Branches of the brachial plexus

Answer 19

Axillary, musculocutaneous, raidal, median, ulnar.

Question 20

Path of the axillary nerve

Answer 20

Comes off of a cord, then travels through the axilla. Divides into anterior and posterior branches and creates a cuff around the deltoid.

Question 21

Muscles innervated by the axillary nerve

Answer 21

Deltoid and teres major.

Question 22

Path of the musculocutaneous nerve

Answer 22

Comes off of a cord, then travels deep to the pec minor. Pierces the coracobrachialis and travels down the anterior humerus.

Question 23

Muscles innervated by the musculocutaneous nerve

Answer 23

Biceps brachii, brachialis, coracobrachialis

Question 24

Path of the radial nerve

Answer 24

Comes off of a cord. Travels deep to pec minor and through the axilla then down the posterior humerus between the medial and lateral heads of triceps brachii.

Question 25

Muscles innervated by radial nerve

Answer 25

Triceps, anconeus, brachioradialis, most wrist extensors, abductor pollicis, supinator

Question 26

Path of the median nerve

Answer 26

Comes off of a cord, then travels deep to the pec minor, through the axilla, pierces pronator teres and then through the carpal tunnel.

Question 27

Muscles innervated by the median nerve

Answer 27

Pronator teres, palmaris longus, pronator quadratus, muscles of the thenar eminence, some wrist flexors

Question 28

Path of the ulnar nerve

Answer 28

Comes off of a cord, travels deep to the pec minor, through the axilla.

Question 29

Muscles innervated by the ulnar nerve

Answer 29

Some wrist flexors, muscles of the hand except for the thenar eminence.

Question 30

Borders of the deltopectoral triangle

Answer 30

Clavicle (superior), pectoralis major (medial), anterior deltoid (lateral)

Question 31

Contents of the deltopectoral triangle

Answer 31

Cords of the brachial plexus, axillary artery and vein

Question 32

Borders of the cubital fossa

Answer 32

Biceps insertion (superior lateral), bicipital aponeurosis (superior medial), pronator teres (inferior medial), brachioradialis (inferior lateral)

Question 33

Contents of the cubital foss

Answer 33

Brachial artery and vein, median nerve

Question 34

Floor of the carpal tunnel

Answer 34

The 4 intermediate carpal bones (lunate, triquetrum, trapezoid, capitate)

Question 35

Cieling of the carpal tunnel

Answer 35

Flexor retinaculum

Question 36

Contents of the carpal tunnel

Answer 36

Tendons of FDS, FDP, FCR, FPL and the median nerve

Question 37

Nerves of the brachial plexus which are mixed

Answer 37

Musculocutaneous, axillary , median, radial, ulnar