Lab 3 - Spinal Nerves

Question 1

Phrenic

Answer 1

Cervical plexus
C3-C5
Innervates diaphragm
No sensory innvervation

Question 2

Musculocutaneous

Answer 2

Brachial plexus
C5-C7
Innervates biceps brachii, Brachialis, coracobrachialis
Sensory innervation: skin of lateral forearm

Question 3

Median nerve

Answer 3

Brachial plexus
C5-T1
Innervates flexors of the wrist
Sensory innervation: skin of lateral half of palm, thumb, first 2 fingers

Question 4

Ulnar nerve

Answer 4

Brachial plexus
C8-T1
Innervates medial flexors of wrist
Sensory innervation: skin of medial half of palm and 4th and 5th digits

Question 5

Axillary nerve

Answer 5

Brachial plexus
C5-C6
Innervates deltoid and shoulder joint
Sensory innervation: skin of arm inferior to axilla

Question 6

Radial nerve

Answer 6

Brachial plexus
C5-T1
Innervates muscles of posterior arm - triceps brachii and wrist extensors
Sensory innervation: skin of posterior upper limb

Question 7

Femoral

Answer 7

Lumbar plexus
L2-L4
Innervates thigh flexors and quads
Sensory innervation: anteromedial skin of thigh and leg

Question 8

Obturator nerve

Answer 8

Lumbar plexus
L2-L4
Innervates adductors
Sensory innervation: small patch of medial thigh

Question 9

Sciatic nerve

Answer 9

Sacral plexus
L4-S3
Innervates hamstrings
(Also has tibial and fibular branches)

Question 10

Tibial

Answer 10

Branch of sciatic nerve
Sacral plexus
L4-S3
Innervates plantar flexors
Sensory innervation: skin of posterior calf
*branch closer to big toe

Question 11

Fibular

Answer 11

Branch of sciatic nerve
L4-S2
Dorsiflexors (top of foot)
Skin of anterior shin
*on side closer to pinky toe