Changes

==Distal Phalanx==

==Distal Phalanx==

The distal phalanx is rounded to a point distally.  

The distal phalanx is rounded to a point distally; articulating with another bone only at the proximal end.  It does not have a cortex or medullary cavity, but has three surfaces: articular surface, parietal surface and solar surface.

The proximal articular surface has two concavities separated by a ridge. The palmar border meets with the distal sesamoid (navicular) bone. The dorsal aspect has a marked '''extensor process''', where the common digital extensor attaches.  

:The proximal '''articular surface''' has two concavities separated by a ridge. The palmar border meets with the distal sesamoid (navicular) bone. The dorsal aspect has a marked '''extensor process''', where the common digital extensor attaches.  

The solar surface has two distinct areas, the more palmar area is the roughened flexor surface and the remainder is smooth, concave and crescent-shaped. There is a '''solar groove''' on each side of the flexor surface, which leads to the '''solar canal'''. The palmar aspect extends either side to form the medial and lateral '''palmar processes''', which each have a foramen.  There is a notch in the dorsal solar border, known as the '''crena marginis solearis'''.

:The '''solar surface''' has two distinct areas, the more palmar area is the roughened flexor surface and the remainder is smooth, concave and crescent-shaped. There is a '''solar groove''' on each side of the flexor surface, which leads to the '''solar canal'''. The palmar aspect extends either side to form the medial and lateral '''palmar processes''', which each have a foramen.  The juction between the solar surface and the parietal surface forms the solar border. There is a notch in the dorsal solar border, known as the '''crena marginis solearis'''.

The parietal surface of the distal phalanx is that which conforms to the hoof wall. It is convex, rough, porous and has processes on each side heading in a palmar direction. There are many foramina and grooves on this surface for vasculature and nerves to pass.  The '''ungual (collateral) cartilages''' attach to these processes, they are squarish plates which are palpable above the level of the hoof. They become more fibrous in life and may ossify.  

:The '''parietal surface''' of the distal phalanx is that which conforms to the hoof wall. It is convex, rough, porous and has processes on each side heading in a palmar direction. There are many foramina and grooves on this surface for vasculature and nerves to pass.  The '''ungual (collateral) cartilages''' attach to these processes, they are squarish plates which are palpable above the level of the hoof. They become more fibrous in life and may ossify.

==Distal Sesamoid (Navicular) Bone==

==Distal Sesamoid (Navicular) Bone==