Changes

* '''Caudal circumflex humeral vessels'''

* '''Caudal circumflex humeral vessels'''

The '''thoracodorsal and circumflex arteries''' are branches of the '''subscapular artery'''.  The '''cranial circumflex humeral artery''' runs deep to the coracobrachialis to supply the biceps; its corresponding satellite vein can cross the coracobrachialis on either surface.  The '''thoracodorsal vein''' gives rise to the '''superficial thoracic vein''', which passes caudally to drain the ventral part of the trunk.

The '''thoracodorsal and circumflex arteries''' are branches of the '''subscapular artery'''.  The '''cranial circumflex humeral artery''' runs deep to the coracobrachialis to supply the [[Muscles of the Elbow - Horse Anatomy#Flexors|''biceps'']]; its corresponding satellite vein can cross the coracobrachialis on either surface.  The '''thoracodorsal vein''' gives rise to the '''superficial thoracic vein''', which passes caudally to drain the ventral part of the trunk.

The '''brachial vessels''' give rise to deep brachial vessels, which supply the triceps.  More distally, brachial vessels form '''bicipital vessels''' to the biceps.  The next branches from the brachial vessels are the '''transverse cubital vessels''', which pass deep to the biceps.  The '''collateral ulnar vessels''' arise from the caudal surface of the brachial vessels, following the path of the ulnar nerve.  The final branches are the '''common interosseous vessels''', which pass through the interosseous space to continue as the '''cranial interosseous vessels'''.

The '''brachial vessels''' give rise to deep brachial vessels, which supply the [[Muscles - Horse Anatomy#Muscles of the Elbow|''triceps'']].  More distally, brachial vessels form '''bicipital vessels''' to the [[Muscles - Horse Anatomy#Muscles of the Elbow|''biceps'']].  The next branches from the brachial vessels are the '''transverse cubital vessels''', which pass deep to the [[Muscles - Horse Anatomy#Muscles of the Elbow|''biceps'']].  The '''collateral ulnar vessels''' arise from the caudal surface of the brachial vessels, following the path of the ulnar nerve.  The final branches are the '''common interosseous vessels''', which pass through the interosseous space to continue as the '''cranial interosseous vessels'''.

The '''brachial vein''' gives rise to the '''median cubital vein''' at the level of the elbow. This subsequently anastamoses with the '''cephalic vein'''.  The cephalic vein leaves the groove between the brachiocephalicus and pectoralis descendens and runs distally on the medial surface of the antebrachium. At the elbow joint, it gives rise to the '''accessory cephalic vein''' which runs parallel to the cephalic vein but then curves cranially to terminate on the dorsal surface of the carpus.

The '''brachial vein''' gives rise to the '''median cubital vein''' at the level of the [[Joints and Ligaments - Horse Anatomy#Elbow Joint|elbow]]. This subsequently anastamoses with the '''cephalic vein'''.  The cephalic vein leaves the groove between the [[Muscles - Horse Anatomy#Extrinsic Musculature of the Thoracic Limb|''brachiocephalicus'']] and [[Muscles - Horse Anatomy#Extrinsic Musculature of the Thoracic Limb|''pectoralis descendens'']] and runs distally on the medial surface of the antebrachium. At the [[Joints and Ligaments - Horse Anatomy#Elbow Joint|elbow]] joint, it gives rise to the '''accessory cephalic vein''' which runs parallel to the cephalic vein but then curves cranially to terminate on the dorsal surface of the [[Joints and Ligaments - Horse Anatomy#Carpal Joint|carpus]].

The '''median artery''' gives off its palmar branch before passing through the carpal canal. It is then joined by a branch of the '''radial artery''' and continues towards the digit as the '''medial palmar artery'''. The smaller '''lateral palmar artery''' originates from the union of the '''palmar branch of the median artery''' with the '''collateral ulnar artery''' proximal to the carpus.

The '''median artery''' gives off its palmar branch before passing through the carpal canal. It is then joined by a branch of the '''radial artery''' and continues towards the digit as the '''medial palmar artery'''. The smaller '''lateral palmar artery''' originates from the union of the '''palmar branch of the median artery''' with the '''collateral ulnar artery''' proximal to the [[Joints and Ligaments - Horse Anatomy#Carpal Joint|carpus]].

The '''median and radial arteries''' branch and then anastamose to form the '''deep palmar arch''' at the level of the carpus. The '''median and lateral palmar metacarpal arteries''' arise from the deep palmar arch.  They run distally on the axial surface of the medial and lateral splint bones, respectively.

The '''median and radial arteries''' branch and then anastamose to form the '''deep palmar arch''' at the level of the [[Joints and Ligaments - Horse Anatomy#Carpal Joint|carpus]]. The '''median and lateral palmar metacarpal arteries''' arise from the deep palmar arch.  They run distally on the axial surface of the [[Bones and Cartilages - Horse Anatomy#Metacarpals and Metatarsals|medial and lateral splint bones]], respectively.

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 [[Joints and Ligaments - Horse Anatomy#Carpal Joint|carpus]], the '''medial palmar artery''' has just passed through the carpal canal and then vein has crossed the [[Joints and Ligaments - Horse Anatomy#Carpal Joint|carpus]] superficial to the flexor retinaculum.  In the metacarpus, the vessels lie medial to the interosseous and [[Tendons - Horse Anatomy#Flexors|deep digital flexor tendons]]. At the [[Joints and Ligaments - Horse Anatomy#Metacarpophalangeal (Fetlock) Joint|metacarpophalangeal (fetlock) joint]] , the '''medial palmar vessels''' become the '''medial digital vessels'''.  The '''lateral palmar vessels''' run past the carpus adjacent the the [[Bones and Cartilages - Horse Anatomy#Carpal Bones|accessory carpal bone]].

===Distal===

===Distal===