LP #96 Innervation Of Upper Limb

Question 1

• Formed by n roots: C5, C6, C7, C8 & T1

* originates from medial & lateral cords

Answer 1

Median nerve

Question 2

Median sensory Innervation

Answer 2

• anterior surface of lateral 3 1/2 digits

* distal 1/2 of dorsal 3 1/2 digits

Question 3

Median nerve motor Innervation

Answer 3

• Antebrachium
• pronator teres
• flexor carpi radialis
• palmaris longus
• flexor digitorum profundus (lateral 1/2)
• flexor pollicis longus
• pronator quadratus

Question 4

Median nerve (the hand)?

Answer 4

• Thenar mm

* lateral 2 lumbricals

Question 5

Ulnar nerve sensory Innervation

Answer 5

• elbow
• wrist *medial 1 1/2 digits
• hand (dorsum & palm)

Question 6

Ulnar nerve motor Innervation

Answer 6

• antebrachium
• flexor carpi ulnaris
• flexor digitorum profundus (medial 1/2)

Question 7

Ulnar nerve (hand)

Answer 7

• interossei
• medial two (2) lumbricals
• hypothenar mms
• adductor pollicis

Question 8

• formed from n roots C5, C6, C7, C8, T1

* originates from posterior cord

Answer 8

Radial nerve

Question 9

Radial nerve sensory Innervation

Answer 9

• posterior medial brachium
• inferolateral brachium
• elbow
• posterolateral antebrachium
• wrist
• dorsum of hand
• proximal aspect- lateral 3 1/2 digits

Question 10

Radial nerve motor Innervation

Answer 10

• all extensor mm (upper limb)
• posterior brachial mm
• extensor supinator mm (forearm)

Question 11

• formed by n roots: C5, C6, C7

* originates from arterial cord

Answer 11

Musculocutaneous nerve

Question 12

Musculocutaneous nerve sensory Innervation

Answer 12

*skin over lateral forearm

Question 13

Musculocutaneous nerve motor Innervation

Answer 13

• coracobrachialis
• biceps brachii
• brachialis

Question 14

• deep to SCM
• formed by ventral rami of C1-C4 spinal nerves
• innervates:
• scalp
• neck
• shoulders
• nerves have motor * sensory branches

Answer 14

Cervical plexus

Question 15

Branches of the cervical plexus

Answer 15

• most are cutaneous (innervate skin)

* some are motor & innervate mm of neck/shoulder & the diaphragm

Question 16

The cervical plexus- cutaneous sensory branches:

Supplies sensory Innervation to?

Answer 16

• ear
• posterolateral neck
• anterior cervical triangle
• upper anterior chest & shoulder

Question 17

The cervical plexus-cutaneous sensory branches

*sensory Innervation are via?

Answer 17

• lesser occipital nerve (C2-C3)
• posterior lateral neck & ear
• greater articular nerve (C2-C3)
• ear b/w angle of mandible & mastoid process
• transverse cervical nerve (C2-C3)
• anterior/lateral neck & cervical triangle
• supraclavicular nerves (C3-C4)
• upper anterior chest, shoulder, SC & AC joints

Question 18

Motor branches: cervical plexus

Answer 18

• ansa cervicalis (C1-C3)
• infrahyoid mms

*phrenic nerve (C3-C5)
-diaphragm
(C 3,4,5 keep diaphragm alive)

Question 19

Motor branches: cervical plexus

*segmental & other branches C1-C5 serve?

Answer 19

• deep mm of neck

* portion of scalenes, levator scapulae, trapezium, SCM

Question 20

Motor branches: cervical plexus

*deep motor branches arise from cervical roots & provide Innervation to?

Answer 20

• rhomboids
• serratus anterior
• prevertebral mm

Question 21

Motor branches: dorsal rami (cervical region)

• not part of cervical plexus
• innervates?

Answer 21

• superficial, intermediate & deep intrinsic back mms that extend into neck
• all suboccipital mms