5. Spinal Nerves

Question 1

Arise along the spinal cord from the dorsal roots and ventral roots

Answer 1

Spinal nerves

Question 2

All the spinal nerves contain axons of both sensory and somatic motor neurons called ?

Answer 2

Mixed nerves

Question 3

Area of the skin applied w/ sensory innervation

Answer 3

Dermatome

Question 4

3 major plexuses

Answer 4

Cervical plexus
Brachial plexus
Lumbosacral plexus

Question 5

Supplies motor innervation to the muscles of the pelvic floor and sensory cutaneous innervation to the skin over the coccyx

Answer 5

Coccygeal plexus

Question 6

Originates from spinal nerves C1 to C4

Answer 6

Cervical plexus

Question 7

Important branches of cervical plexus

Innervates the diaphragm

Answer 7

Phrenic nerve

Question 8

Originates from spinal nerves C5 to T1

Answer 8

Brachial plexus

Question 9

Innervates two shoulder muscles and skin over part of the shoulder

Answer 9

Axillary nerve

Question 10

Innervates all muscles in the posterior surface of the arm and forearm

Answer 10

Radial nerve

Question 11

Top of the crutch can compress the radial nerve against the humerus. Compression can cause dysfunction of the radial nerve resulting in paralysis of the posterior arm and forearm muscles

Answer 11

Crutch paralysis

Question 12

Innervates the anterior muscles of the arm and the skin over the radial surface of the forearm

Answer 12

Musculocutaneous nerve

Question 13

Innervates two anterior forearm muscles and most of the intrinsic hand muscles

Answer 13

Ulnar nerve

Question 14

Innervates most of the anterior forearm muscles and some of the intrinsic hand muscles

Answer 14

Median nerve

Question 15

Originates from spinal nerves L1 to S4

Answer 15

Lumbosacral plexus

Question 16

Innervates the muscles of the medial thigh and the skin over the same region

Answer 16

Obturator nerve

Question 17

Innervates the anterior thigh muscles and skin over the anterior thigh and medial side of the leg

Answer 17

Femoral nerve

Question 18

Innervates the posterior thigh muscles, anterior and posterior leg muscles ad most of the intrinsic foot muscles

Answer 18

Tibial nerve

Question 19

Innervates the muscles of the lateral thigh and leg and some intrinsic foot muscles

Answer 19

Common fibular nerve

Question 20

Tibial and common fibular nerves are bound together within a connective tissue sheath and together called ______

Answer 20

Sciatic nerve