Changes

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==Thoracic Limb Proximal==

==Thoracic Limb==

===Proximal===

The '''subclavian artery''' gives rise to the '''superficial cervical artery''', before it becomes the '''axillary artery'''.  The '''deltoid branch''' of the superficial cervical artery accompanies the '''cephalic vein''' (arises from the external jugular vein) though a groove between the ''brachiocephalicus'' and ''pectoralis descendens''.  The '''axillary vessels''' give rise to the following vessels before becoming the '''brachial artery''':  

The '''subclavian artery''' gives rise to the '''superficial cervical artery''', before it becomes the '''axillary artery'''.  The '''deltoid branch''' of the superficial cervical artery accompanies the '''cephalic vein''' (arises from the external jugular vein) though a groove between the ''brachiocephalicus'' and ''pectoralis descendens''.  The '''axillary vessels''' give rise to the following vessels before becoming the '''brachial artery''':  

* '''External thoracic vessels''': supply the pectoral muscles

* '''External thoracic vessels''': supply the pectoral muscles

Just distal to the carpus, the '''medial palmar artery''' has just passed through the carpal canal and then vein has crossed the carpus superficial to the flexor retinaculum.  In the metacarpus, the vessels lie medial to the interosseous and deep digital flexor tendon. At the metacarpophalangeal (fetlock) joint, the '''medial palmar vessels''' become the '''medial digital vessels'''.  The '''lateral palmar vessels''' run past the carpus adjacent the the accessory carpal bone.

Just distal to the carpus, the '''medial palmar artery''' has just passed through the carpal canal and then vein has crossed the carpus superficial to the flexor retinaculum.  In the metacarpus, the vessels lie medial to the interosseous and deep digital flexor tendon. At the metacarpophalangeal (fetlock) joint, the '''medial palmar vessels''' become the '''medial digital vessels'''.  The '''lateral palmar vessels''' run past the carpus adjacent the the accessory carpal bone.

==Thoracic Limb Arteries==

===Distal===

===Digit and Fetlock===

====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 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 '''medial and lateral digital arteries''' enter the solar foramen and form the '''terminal arch''' within the solar canal of the distal phalanx.  Branches  from the terminal arch run through foraminae on the parietal surface of the distal phalanx to supply the laminar corium. Several of these branches emerge near the solar border and anastamose to form the '''marginal artery of the sole'''.  This supplies the solar and cuneate corium.

The '''medial and lateral digital arteries''' enter the solar foramen and form the '''terminal arch''' within the solar canal of the distal phalanx.  Branches  from the terminal arch run through foraminae on the parietal surface of the distal phalanx to supply the laminar corium. Several of these branches emerge near the solar border and anastamose to form the '''marginal artery of the sole'''.  This supplies the solar and cuneate corium.

==Thoracic Limb Veins==

====Veins====

===Digit===

Venous drainage from the laminar corium is via '''parietal veins''' from the laminar circulation to the '''parietal venous plexus''' and '''coronary venous plexus'''.  The coronary venous plexus also receives veins from the perioplic and coronary corium.  Veins from the solar and cuneate corium drain into the '''solar venous plexus'''.

Venous drainage from the laminar corium is via '''parietal veins''' from the laminar circulation to the '''parietal venous plexus''' and '''coronary venous plexus'''.  The coronary venous plexus also receives veins from the perioplic and coronary corium.  Veins from the solar and cuneate corium drain into the '''solar venous plexus'''.