Equine thoracic limb nerves

Ventral branches of cervical and thoracic spinal nerves C6, C7, C8, T1, T2

What forms the brachial plexus

Long thoracic n

Lateral thoracic n

Suprascapular n

Subscapular n

Thoracodorsal n

Axillary n

Cranial pectoral n

Caudal pectoral n

Radial n

Musculocutaneous n

Median n

Ulnar n

What are the major nerves of the equine thoracic limb

Long thoracic n

Innervation of serratus ventralis

Serratus ventralis

Target of innervation of long thoracic n

Lateral thoracic n

Innervation of cutaneous trunci muscle

Cutaneous trunci muscle

Target of innervation of lateral thoracic n

Suprascapular

Innervation of supraspinatus

Suprascapular

Innervation of infraspinatus

Supraspinatus

Infraspinatus

Target of innervation of suprascapular n

Subscapularis

Target of innervation of subscapular n

Subscapular n

Innervation of subscapularis

Thoracodorsal n

Innervation of latissimus dorsi

Latissimus dorsi

Target of innervation of thoracodorsal n

Axillary n

Innervation of teres major

Axillar n

Innervation of teres minor

Axillary n

Innervation of deltoideus

Teres major

Teres minor

Deltoideus

Target of innervation of axillary n

Pectoral muscles

Target of innervation of cranial and caudal pectoral nn

Cranial and caudal pectoral nn

Innervation of pectoral muscles

Triceps brachii

Extensors of carpus and digits

Target of innervation of radial n

Radial n

Innervation of triceps brachii

Radial n

Innervation of extensors of carpus and digits

Musculocutaneous n

Median n

What 2 nerves are fused proximally in the equine thoracic limb

Fused together proximally with no communicating branch (since they're already attached)

Proximal and distal muscular branches belong SOLELY to musculocutaneous n despite being part of fused nerve

Once the distal muscular branch leaves, the nerve is referred to only as median nerve

What is the structure of the musculocutaneous and median nerves in the horse

Ulnar n

Innervation of flexors of carpus and digits

Flexors of carpus and digits

Target of innervation of ulnar nerve

Median and ulnar nerves

What major nerves contribute to the nerve pathway distal to the equine carpus

Medial palmar nerve: at level of fetlock joint, name changes to:

-medial digital n: gives rise to dorsal branch of the medial digital n. Just distal to the fetlock joint

Lateral palmar nerve: at level of fetlock joint, name changes to:

-lateral digital n: gives rise to dorsal branch of the lateral digital n. Just distal to the fetlock joint

Communicating branch

-at the palmar mid-metacarpal region

-connects the medial and lateral palmar nerves

-sits on top of SDF tendon

What are the branches of the median nerve

Dorsal branch of the ulnar n.

Palmar branch of the ulnar n:

-fuses with the lateral palmar n from the median n

Deep branch of the lateral palmar n

-medial palmar metacarpal n

-lateral palmar metacarpal n

What are the branches of the ulnar nerve

Median digital nerve consists of only median n fibers

Lateral digital nerve consists of both median and ulnar nn fibers

What is the difference in fiber composition between the medial and lateral digital nerves

Cutaneous antebrachial nn

General name for the nerves that supply the skin of the antebrachium

Cranial cutaneous antebrachial n

-Axillary n parent

Caudal cutaneous antebrachial n

-ulnar n parent

Medial cutaneous antebrachial n

-musculocutaneous n parent

Lateral cutaneous antebrachial n

-radial n parent

What are the cutaneous antebrachial nerves