Nervous System Brachial Plexus

Question 1

cervical intumescence

Answer 1

thoracic limb innervation
C6-T2
center of brachial plexus

Question 2

dorsal root

Answer 2

comprised of afferent fibers
sensory

Question 3

ventral root

Answer 3

comprised of efferent fibers
motor neurons

Question 4

dorsal branch

Answer 4

carries nerve fibers that innervate structures dorsal to the transverse processes
afferent and efferent fibers (bidirectional)

Question 5

ventral branch

Answer 5

carries nerve fibers that innervate structures ventral to the transverse processes
afferent and efferent fibers (bidirectional)

Question 6

brachial plexus

Answer 6

network of nerves
formed by ventral branches of spinal nerves C6-T2, cranial to first rib
nerve supply to thoracic limb

Question 7

nerve supply to thoracic limb

Answer 7

motor to skeletal muscles
cutaneous sensory from skin
proprioception from thoracic limb

Question 8

phrenic nerve

Answer 8

motor nerve of diaphragm related with brachial plexus
right and left phrenic

Question 9

autonomous zone

Answer 9

innervated by only one nerve
where you want to know in order to diagnose where affected nerve is

Question 10

brachiocephalic n

Answer 10

innervate cleidobrachialis m

Question 11

thoracodorsal n

Answer 11

innervate latissimus dorsi m

Question 12

suprascapular n

Answer 12

innervate supraspinatus and infraspinatus mm
motor

Question 13

scapular n

Answer 13

innervate subscapularis m
motor

Question 14

musculocutaneous n

Answer 14

motor to biceps brachii, brachialis, and coracobrachialis mm
sensory to medial antebrachium and palmar manus
** if cut cannot flex cubital

Question 15

axillary n

Answer 15

motor to teres major, teres minor, deltoideus and caudal subscapularis mm
sensory to craniolateral shoulder and cranial antebrachium

Question 16

radial n (proximal portion)

Answer 16

motor to triceps brachii (cannot bear weight w/o), tensor fasciae antebrachii and anconeus mm

Question 17

radial n (distal portion)

Answer 17

deep branch innervate extensors and supinator of antebrachium (motor)
superficial branch sensory to cranial and lateral antebrachium and medial and dorsal manus

Question 18

median n

Answer 18

motor to pronator teres and quadratus, flexor carpi radialis, SDF, DDF
sensory to palmar aspect of manus

Question 19

ulnar n

Answer 19

motor to flexor carpi ulnaris, DDF, interossei mm
sensory to caudal antebracium and palmar manus (5th digit and caudal side)