Thoracic Nerves Condensed Flashcards
Suprascapular N.
Innervates:
Supraspinatus
Infraspinatus
Subscapular N.
Innervates:
Subscapularis
Musculocutaneous N.
Innervates:
Biceps Brachii
Brachialis
Coracobrachialis
Skin over the medial aspect of the antebrachium
Axillary N.
Innervates:
Deltoideus
Teres major
Teres minor
Skin over the lateral aspect of the brachium and over the cranial aspect of the antebrachium
Radial N.
Innervates: Triceps brachii Extensor carpi radialis Ulnaris lateralis Common digital extensor Lateral digital extensor
Skin over the craniolateral aspect of the antebrachium and the carpus and over the dorsal aspect of the forepaw
Median N.
Innervates:
Flexor carpi radialis
Superficial digital flexor
Skin over the palmar aspect of the metacarpus and digits
Ulnar N.
Innervates:
Flexor carpi ulnaris
Deep digital flexor
interosseous muscles - palmar branch
Skin
- caudal aspect of antebrachium
- palmar surface of carpus, metacarpus, and digits
- lateral surface of fifth digit
Cranial pectoral N.
Innervates:
Superficial pectoral m.
Caudal pectoral N.
Innervates:
deep pectoral m.
Long thoracic N.
Innervates:
serratus ventralis m.
Thoracodorsal N.
Innervates:
latissimus dorsi
Lateral thoracic N.
Innervates:
cutaneous trunci
What muscle group does the Ulnar N. and Median N. innervate?
Flexor muscles of carpus
Flexor muscles of digit
Interosseous muscles
What muscle groups does the Radial N. innervate?
Extensor muscles of elbow
Extensor muscles of carpus and ulnaris lateralis
Extensor muscles of digits
What muscle group does the Axillary N. innervate?
Flexor muscles of humeral joint
What muscle group does the Musculocutaneous N. innervate?
Flexor muscles of cubital joint
Injury to the Suprascapular N.
- Usually caused by trauma
- Paralysis of suprascapular n. results in atrophy of supraspinatus m. and infraspinatus m.
- Standing animal has abducted shoulder -> more pronouced during locomotion (“shoulder slip”)
Injury to Musculocutaneous N.
- Uncommon
- would paralyze main flexor muscles of cubital joint
Injury to Radial N.
- Avulsion of brachial plexus - most common cause is hit by car = trauma
- More proximal the damage, the more severe syndrome and more grave the prognosis
- Proximal to tricipital branches = paralysis of extensor muscles of elbow, carpus, and digit
- flaccid paralysis of effected thoracic limb
- non-weight bearing lameness
- foot is dragged with its dorsal surface on the ground
- Distal to tricipital branches = paralysis of extensor muscles of carpus and digit
- normal stance of shoulder and elbow are maintained
- affected manus knuckles over - rests dorsal surface of the toe on the gorund
