Ulnar nerve Flashcards Preview

MSK > Ulnar nerve > Flashcards

Flashcards in Ulnar nerve Deck (13):
1

Course of ulnar nerve

Continuation of medial cord and leaves axilla
Descends medially down arm
At elbow it enters the forearm posteriorly to medial epicondyle (here it is easily palpable and vulnerable to injury)
In forearm, pierces 2 heads of flexor carpi ulnaris and descends alongside the ulna
Enters hand via ulnar canal/Guyon's canal, superficial to flexor retinaculum

2

Termination of ulnar nerve

In the hand it divides into:

Deep branch
Superficial branch

3

What branches arise in the forearm

Muscular branch
Palmar cutaneous branch
Dorsal cutaneous branch

4

Function of muscular branch

Motor Innervation of:

Flexor carpi ulnaris
Medial half of flexor digitorum profundus

5

Function of deep branch

Motor Innervation to:

Hypothenar muscles
Medial 2 lumbricals
Adductor pollicis
Interossei

6

Spinal roots

C8 and T1

7

Function of palmar cutaneous branch

Sensory innervation to medial half of palm

8

Function of dorsal cutaneous branch

Sensory Innervation to dorsal surface of medial 1 and 1/2 fingers and associated dorsal area

9

Function of superficial branch

Sensory Innervation to palmar surface of medial 1 and 1/2 fingers

10

How is the ulnar nerve damaged at the elbow

Fracture of medial epicondyle

11

Consequence of damage at elbow

Paralysis of flexor carpi ulnaris and medial half of flexor digitorum profundus
Wrist Flexion is accompanied by abduction
Paralysis of hypothenar muscles, medial 2 lumbricals, adductor pollicis, interossei
Loss of sensory function over medial half of hand
Ulnar paradox

12

How does damage to ulnar nerve at wrist occur

Lacerations to wrist

13

Consequence of damage at wrist

Paralysis of interossei, medial 2 lumbricals, adductor pollicis, hypothenar muscles
Sensory loss over palmar surface of medial 1 and 1/2 fingers only
Ulnar claw

Decks in MSK Class (87):