Brachial Plexus/Nerves of Upper Limb

Question 1

what does brachial plexus provide?

Answer 1

motor, sensory, and sympathetic innervation to upper limb

Question 2

what is brachial plexus composed of?

Answer 2

ventral rami of spinal nerves C5-T1

Question 3

how is brachial plexus organized?

Answer 3

Rami
Trunks
Divisions
Cords
Branches

**Roy T Drinks Cold Beer

Question 4

trunks of brachial plexus?

Answer 4

upper - C5/C6
middle - C7
lower - C8/T1

Question 5

division of brachial plexus?

Answer 5

anterior - medial and lateral cords
posterior - posterior cord

(6 total)

Question 6

cords of brachial plexus?

Answer 6

first portion located in axilla**

-named in relation to axillary artery

Question 7

lateral cord formation?

Answer 7

union of two anterior divisions
-one from upper trunk and one from middle trunk
C5, C6, C7

Question 8

medial cord formation

Answer 8

direct continuation of anterior portion of lower trunk (C8/T1)

Question 9

posterior cord formation

Answer 9

posterior division of all three trunk
all spinal nerves participate
C5-T1

Question 10

terminal branches of brachial plexus?

Answer 10

musculocutaneous, median, ulnar, radial, axillary

??

Question 11

lateral pectoral nerve

Answer 11

branch of lateral cord

innervates pectoralis major

Question 12

musculocutaneous nerve

Answer 12

terminal branch of lateral cord

innervates anterior compartment of arm (flexors)

C5 C6 C7

Question 13

medial pectoral nerve

Answer 13

branch of medial cord

innervates pectoralis major and minor

Question 14

medial brachial cutaneous nerve

Answer 14

branch of medial cord

cutaneous innervation to medial arm

Question 15

medial antebrachial cutaneous nerve

Answer 15

branch of medial cord

cutaneous innervation to medial forearm

Question 16

ulnar nerve

Answer 16

terminal branch of medial cord

C8 T1

Question 17

upper subscapular nerve

Answer 17

branch of posterior cord

innervates subscapularis

Question 18

thoracodorsal nerve

Answer 18

branch of posterior cord
aka middle subscapular nerve
innervates latissimus dorsi

Question 19

lower subscapular nerve

Answer 19

branch of posterior cord

innervates subscapularis and teres major

Question 20

axillary nerve

Answer 20

one of terminal branches of posterior cord
innervates the deltoid and teres minor
C5 and C6

Question 21

radial nerve

Answer 21

one of terminal branches of posterior cord
innervates all muscle of dorsal surface of upper limb (extensors)
C5-T1

Question 22

median nerve

Answer 22

terminal branch of brachial plexus

• receives C6 and C7 from lateral cord (C5 rare)
• receives C8 and T1 from medial cord

innervates ventral antebrachial muscles as well as thenar muscles of hand

Question 23

what are the supraclavicular branches?

Answer 23

dorsal scapular nerve
suprascapular nerve
nerve to subclavius
long thoracic nerve

Question 24

what does each ventral rami in the brachial plexus receive?

Answer 24

gray ramus postganglionic sympathetic fiber distributed via the nearly adjacent cervical sympathetic trunk

Question 25

dorsal scapular nerve

Answer 25

direct from C5

innervates levator scapulae, rhomboid major and minor

Question 26

suprascapular nerve

Answer 26

forms at junction of C5 C6

-innervates supra and infraspinatus

Question 27

nerve to subclavius

Answer 27

from upper trunk (C5 C6)

-innervates subclavius

Question 28

long thoracic nerve

Answer 28

from C5, C6, C7

innervates serratus anterior

Question 29

dermatomal innervation of the upper limb?

Answer 29

C4-T3

• C5-T1 from brachial plexus
• C4 from supraclavicular nerves of cervical plexus
• T1,T2, and sometimes T3 from intercostal brachial cutaneous nerves

Question 30

how does brachial plexis get to upper limb?

Answer 30

through the cervicoaxillary canal through the axilla