Changes

===Distal===

===Distal===

====Arteries====

====Arteries====

The arterial supply to the digit and fetlock of the thoracic limb comes mainly from the '''median palmar artery'''. The median palmar artery divides in the distal fourth of the metacarpus, between the superficial and digital flexor tendons and the suspensory ligament, to become the '''medial and lateral digital arteries'''. Part of the '''deep palmar arch''' anastamoses with the '''lateral digital artery''' to form the '''superficial palmar arch''', which supplies the fetlock joint.

The arterial supply to the digit and fetlock of the thoracic limb comes mainly from the '''median palmar artery'''. The median palmar artery divides in the distal fourth of the [[Bones and Cartilages - Horse Anatomy#Metacarpals and Metatarsals|metacarpus]] between the [[Tendons - Horse Anatomy#Flexors|superficial and deep digital flexor tendons]] and the [[Tendons - Horse Anatomy#Flexors|suspensory ligament]], to become the '''medial and lateral digital arteries'''. Part of the '''deep palmar arch''' anastamoses with the '''lateral digital artery''' to form the '''superficial palmar arch''', which supplies the [[Joints and Ligaments - Horse Anatomy#Metacarpophalangeal (Fetlock) Joint|fetlock joint]].

The digital arteries run superficially in the proximal fetlock region, emerging palmar to their satellite vein and between the palmar digital nerve and its dorsal branch. The medial and lateral digital arteries run distally over the fetlock and each branches to supply the fetlock joint, digital extensor and flexor tendons, digital sheath, ligaments fascia and skin.  

The digital arteries run superficially in the proximal [[Joints and Ligaments - Horse Anatomy#Metacarpophalangeal (Fetlock) Joint|fetlock]] region, emerging palmar to their satellite vein and between the palmar digital nerve and its dorsal branch. The medial and lateral digital arteries run distally over the f[[Joints and Ligaments - Horse Anatomy#Metacarpophalangeal (Fetlock) Joint|fetlock]] and each branches to supply the [[Joints and Ligaments - Horse Anatomy#Metacarpophalangeal (Fetlock) Joint|fetlock joint]], [[Tendons - Horse Anatomy#Extensors|digital extensor]] and [Tendons - Horse Anatomy#Flexors|flexor tendons]] , digital sheath, ligaments fascia and skin.  

The '''short artery of the proximal phalanx''' arises from the medial and lateral digital arteries, immediately dividing into dorsal and palmar branches to form a circle around the middle of the proximal phalanx. This supplies the proximal phalanx and surrounding structures.  The '''palmar branch of the short artery''' runs between the proximal phalanx and the digital flexor tendons to join the contralateral vessel between the sesamoidean ligaments. The '''dorsal branch''' joins the contralateral vessel deep to the common digital extensor tendon.

The '''short artery of the proximal phalanx''' arises from the medial and lateral digital arteries, immediately dividing into dorsal and palmar branches to form a circle around the middle of the proximal phalanx. This supplies the proximal phalanx and surrounding structures.  The '''palmar branch of the short artery''' runs between the proximal phalanx and the digital flexor tendons to join the contralateral vessel between the sesamoidean ligaments. The '''dorsal branch''' joins the contralateral vessel deep to the common digital extensor tendon.