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12 Cards in this Set
- Front
- Back
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The brachial plexus innervates all forelimb muscles except for... (4 muscles) |
Trapezius Omotransversarius Brachiocephalicus Rhomboideus
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What spinal nerves are involved with the brachial plexus? |
Last few cervical and first couple thoracic nerves
C6, C7, C8, *(sometimes C5), T1, T2
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Name the 7 brachial plexus nerves, from cranial to caudal |
1. Suprascapular n. 2. Subscapular n. 3. Musculocutaneous n. 4. Axillary n. 5. Radial n. 6. Median n. 7. Ulnar n. |
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What nerves make up the suprascapular nerve? What muscles does it innervate? What happens if it is injured? |
Suprascapular nerve C6, C7
Superspinatus m. Infraspinatus m.
"Sweeney" or "Shoulder Slip" Paralysis of lateral shoulder muscles |
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What nerves make up the subscapular nerve? What muscles does it innervate?
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Subscapular nerve C6, C7
Subscapularis m.
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What innervates the musculocutaneous nerve? What muscles does it innervate? What happens if it is injured? |
Musculocutaneous nerve C6, C7, C8
FLEXORS: Biceps brachii m. Brachialis m. Coracobrachialis m. Skin of medial antebrachium
Unlikely; Paralysis of main elbow flexors |
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What nerves make up the axillary nerve? What muscles does it innervate?
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Axillary nerve C7, C8
SHOULDER JOINT FLEXORS: Deltoideus m. Teres major m. Teres minor m. (Subscapularis m.) |
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What nerves make up the radial nerve? What muscles does it innervate? What happens if it's injured?
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Radial nerve C7, C8, T1
EXTENSORS of the elbow, carpus and digits Triceps brachii m. Tensor fasciae antebrachii m. Anconeus m. Extensor carpi radialis m. Common digital extensor m. Lateral digital extensor m. Exterior carpi obliquus m. Ulnaris lateralis m. Lateral digital extensor m. Supinator m. Abductor digiti longus I m. Skin of cranial and lateral antebrachium and dorsal paw
Paralysis of elbow and/or carpal and distal extensors, anesthesia of the skin |
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What nerves make up the median nerve? What muscles does it innervate? |
Median nerve (divides into 2 distally) C8, T1
FLEXORS: Pronator teres m. Flexor carpi radialis m. Deep digital flexor m. (humeral, ulnar and radial heads) Superficial digital flexor m. Pronator quadratus m. Skin of caudal antebrachium and palmar paw
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What nerves make up the ulnar nerve? What muscles does it innervate? |
Ulnar nerves (divides into 2 distallly) C8, T1
FLEXORS: Flexor carpi ulnaris m. (humeral and ulnar heads) Deep digital flexor m. (humeral and ulnar heads) Interossei m. Skin of caudal antebrachium, palmar paw, 5th metacarpal, lateral digital surface. |
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How does the median nerve differ in a dog compared to other species? |
The median nerve runs more distally down the forelimb in dogs. |
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How does the radial nerve differ in the horse compared to other species? |
The radian nerve doesn't extend past the carpus in the horse. |
