Horse Hoof Anatomy via Hoof Dissection

This cadaver hoof is a front hoof was used for practice trimming on at one of my trimming clinics. We know nothing of the history of this horse.

However we can see that this hoof has a lot of flaring especially on the left hand side when looking at this photo.

The heels are underrun and the toe angle is low. He appears to be too short in toe height (from the coronet straight down to the ground).

Note the tighter growth coming in at the coronet.

This hoof is fairly uncontracted but the frog and digital cushion are not very robust.

There is flaring all round the hoof wall and the bars are fairly weak also.

The white line, however is fairly tight.

The heels were lowered as much as possible (to keep the horse comfortable if he were still alive) but you can see that the frog is very passive to the ground.

This hoof has some concavity but the sole flattens off towards the wall which indicates that there may not be full sole thickness.

I started by removing some of the hoof wall to discover the sole thickness and locate the lower egde of the coffin bone (P3).

The sole is thicker at the back of the hoof which confirms my initial suspicions about the sole not being full thickness throughout. This horse would have been much more comfortable had he been given the chance to develop full sole thickness but the flaring and low toe angle and underrun heels prevented him gaining correct toe height.

This angle shows the wall thickness.

Here I removed the sole on one side of the hoof to reveal the sole corium (blood filled gel pad) which aids in shock absorption and produces the sole horn.

This photo shows the frog corium from the top.

This photo shows the frog corium from the side and on this horse it is very close to the surface of the frog in places. This is refered to as a prolasped frog corium/digital cushion and proves that this was not a very healthy frog.

Notice also the bruise near the tip of the frog - the frog was too tall in this area which may have contributed to the bruise.

Removing the thin layer of frog corium reveals the digital cushion.

Close-up view of the digital cushion: which was very fatty looking and soft. A healthy digital cushion will be much denser as it responds to stimulation by producing fibro-cartilage. By the looks of this digital cushion this horse did not get anywhere near enough stimulation.

This is a slice through the corium and laminae - the corium is on the bottom side of the photo and the laminae on the top. The corium was attached to the coffin bone and the laminae connect the coffin bone to the hoof wall.

The laminae appeared to be fairly healthy but the corium seemed quite thick and I wonder if this was an adaptation to long term flaring?

This is a slice through the coronet (coronary) band. The skin is on the top side of the photo. The small holes in the coronet band are the tubules which grow down and contribute to the hoof wall. Again we can see the laminae and corium.

This is a slice through the lateral cartilage which on this horse is quite thick and encompasses some blood vessels. Dr Bowker found that on some wild horses the lateral cartilage can be upto an inch thick - this one was just over half an inch which is pretty good for a domestic. However this may have been a result of undue stress as the cartilage had started to ossify (turn to bone) where it connected to the coffin bone.

The lateral cartilage is the whiter area below the hair at the top of the photo. It extends down and connects onto the coffin bone. It was hard to find the lower edge as it had started to ossify.

Here I have removed the lateral cartilage to reveal the joint between P2 (short pastern) and P3 (coffin bone).

This is a close-up of the P2-P3 joint. To the left of the picture is the top of the hoof wall (just below the hairline) The top of P3 (the small semi-circular shape just to the right of the middle of the photo) is level with the top of the wall which is good as it means that the coffin bone has not sunk (there is no distal descent).