Changes

'''''Proximal Phalanx'''''

'''''Proximal Phalanx'''''

The proximal phalanx proximally has two shallow articular surfaces separated by a small sagittal groove. Distally there are two convex areas separated by a sagittal groove.

The proximal phalanx is shaped like an hourglass and is wider proximally than distally. Proximally, it has two shallow articular surfaces separated by a small sagittal groove; the medial cavity is larger than the lateral cavity. Distally there are two convex areas separated by a sagittal groove.

'''''Middle Phalanx'''''

'''''Middle Phalanx'''''

'''''Distal Phalanx'''''

'''''Distal Phalanx'''''

The distal phalanx is rounded to a point distally. The proximal articular surface has two concavities separated by a ridge. The palmar border meets with the distal sesamoid 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. The parietal surface of the distal phalanx is that which conforms to the hoof wall. It is rough, porous and has processes on each side heading in a palmar direction. 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 distal phalanx is rounded to a point distally.  

 

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 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'''''