Brachial plexus

Question 1

what is the brachial plexus?

Answer 1

ventral rami of C5-T1, innervates the upper limb and girdle

Question 2

What are the components of the brachial plexus from medial to deep?

Answer 2

roots
Trunks
divisions
cords
nerves/branches

Question 3

what forms the medial border of the brachial plexus

Answer 3

deep to sternocleidomastoid and anterior scalene

Question 4

what forms the lateral border of the brachial plexus?

Answer 4

axilla

Question 5

what are the roots of the brachial plexus?

Answer 5

ventral rami C5-T1

Question 6

what are the trunks of the brachial plexus?

Answer 6

upper, middle, and lower trunks formed from the merging of roots

Question 7

what are the divisions of the brachial plexus?

Answer 7

each trunk divides into anterior and posterior divisions

Question 8

what are the cords of the brachial plexus?

Answer 8

the 6 divisions converge to form 3 cords: lateral, medial, posterior

Question 9

what are the Nerves/ branches of the brachial plexus

Answer 9

5 major nerves that emerge from the 3 cords: musculocutaneous, median, ulnar, radial, axillary

Question 10

Branches off of roots from the brachial plexus form the _____ ______ nerve and _______ ______ nerve

Answer 10

dorsal scapular
long thoracic

Question 11

what does the dorsal scapular nerve innervate?

Answer 11

rhomboids and a portion of the levator scapulae

Question 12

what does the long thoracic nerve innervate?

Answer 12

serratus anterior

Question 13

Branches off of trunks from the brachial plexus form the nerve to _________ and the ________ nerve

Answer 13

nerve to subclavius, suprascapular nerve

Question 14

what does the nerve to subclavius innervate?

Answer 14

subclavius

Question 15

what does the suprascapular nerve innervate?

Answer 15

supraspinatus and infraspinatus

Question 16

Branches off of the medial and lateral cords of the brachial plexus form __________ and ________ ___________ nerves and _______ _________ nerves

Answer 16

medial and lateral pectoral nerves and medial cutaneous nerves

Question 17

what do the medial and lateral pectoral nerves inneravate?

Answer 17

pectoralis major and minor

Question 18

what do the medial cutaneous nerves innervate?

Answer 18

skin of medial arm and forearm

Question 19

branches off the posterior cord of the brachial plexus form the _______ and _________ _________ nerves and _________ nerve

Answer 19

upper and lower subscapular
thoracodorsal

Question 20

what do the upper and lower subscapular nerves innervate?

Answer 20

subscapularis and teres major

Question 21

what does the thoracodorsal nerve innervate?

Answer 21

latissimus dorsi

Question 22

the ___________, _________, and ___________ nerves innervate the anterior compartment muscles and a large portion of the anterior skin of the upper limb

Answer 22

musculocutaneous, median, and ulnar nerves

Question 23

what do the musculocutaneous, median, and ulnar nerves innervate?

Answer 23

anterior compartment muscles and a large portion of anterior upper limb skin

Question 24

what do the radial and axillary nerves innervate?

Answer 24

posterior compartment and large portion of posterior skin of the upper limb

Question 25

the _______ and _________ nerves innervate the posterior compartment muscles and a large portion of the posterior skin of the upper limb

Answer 25

radial and axillary

Question 26

what does the musculocutaneous nerve innervate?

Answer 26

coracobrachialis, biceps brachii, branchialis (muscles of anterior arm) skin of lateral forearm

Question 27

what does the median nerve innervate?

Answer 27

pronator teres flexor carpi radialis palmaris longus flexor digitorum superficialis lateral portion of flexor digitorum profundus flexor pollicis longus pronator quadratus 3 thenar muscles 2nd and 3rd lumbricals i.e. MOST MUSCLES OF LATERAL FOREARM AND HAND skin of lateral palm and lateral 31/2 digits

Question 28

what does the ulnar nerve innervate?

Answer 28

flexor carpi ulnaris medial portion of flexor digitorum profundus hypothenar muscles adductor pollicis 4th and 5th lumbricals interossei muscles i.e. MOST MEDIAL MUSCLES OF FOREARM AND HAND skin of medial palm and dorsum medial 1/2 digits

Question 29

what does the ulnar nerve pass behind?

Answer 29

medial epicondyle of humerus (funny bone)

Question 30

what is guyons canal?

Answer 30

osseofascial space that extends between pisiform and hook of the hamate that allows the ulnar nerve and ulnar artery to pass into the palm

Question 31

what does the axillary nerve innervate?

Answer 31

deltoid teres minor skin over deltoid

Question 32

what does the radial nerve innervate>

Answer 32

triceps brachii anconeous brachioradialis extensor carpi radialis extensor digitorum extensor digiti minimi extensor carpi ulnaris supinator abductor pollicis longus extensor pollicis (longus and brevis) extensor indicis i.e. Muscles of posterior arm and forearm skin of posterior arm, forearm, and dorsolateral hand