Outer Layers of the Hoof

This is a picture of the bottom outer layers in horse hoof anatomy.

• On the left side of the picture above, you will see the outer most or superficial part of the foot.

The Frog - The frog is the large V shaped structure in the center of the hoof.  It serves for traction, shock absorption, and a hinge to allow the left and right sides of the hoof to flex when the horse turns.

Central Sulcus of the Frog - A sulcus is a depression or natural division. In the frog anatomy it is referring to the the depression between the two sides of the frog.

Collateral Sulcus also call Collateral Grooves - This is a depressions or channels to either the side of the frog, or a secondary sulcus.  The Collateral Grooves are mainly what you clean with your hoof pic.

Crus of the Sole - A branch of the sole

Apex of the Frog - The pointed or top part of the frog

Body of the Sole - The main part of the sole or bottom of the foot is arched and is mainly for protection.

Epidermal laminae - Small ridges in the epidermal (outer most skin) layer

• On the right if you look you can see that one layer of the anatomy has been peeled away, so this is a bit deeper

Stratum Medium of the Hoof Wall - The wall is the main part that bears weight. It grows downward from the coronary band at an average of 3/8" per month.

White Line - A buffer between the movements of the sole and the wall of the foot.

Angles of the Sole and Wall - An angle describes a point where two intersecting borders come together

Heel, Quarters, and Toe - Shows the corresponding anatomy named as such. The toe is located at the front, for example.

Medial View of the Lower Leg and Inside the Hoof

This view of anatomy from the side of a leg cut into half is to show you the inner structure of the foot and a bit into the leg. You can see the different layers of the hoof wall as well as the bones of the leg and foot.

This is a back leg. You can see that from the naming, where it says metatarsal, that refers to tarsus, or the hock indicating a back leg.

Note #14- This wedge shaped structure is fibro-fatty. It is very elastic but has very few nerves and blood vessels and compresses to cushion the bones and absorb shock.
 

 Inner (sensitive) and Outer (non-sensitive) Structures

The idea in this horse hoof anatomy picture is to illustrate the concept of sensitive and non-sensitive structures of the foot.

The sensitive structures and anatomy are generally located more internally (toward the center) provide nourishment which in turn promotes growth. They are rich in blood supply and nerves.

Any injury to this area is extremely painful.

The non-sensitive structures such as the wall are the reason that horses can wear shoes. The shoes are nailed through the non-sensitive areas. These parts are tough and don't have many nerves.

It is almost like our own fingernails. You don't feel much in them until one gets ripped too short, which then gets into the sensitive connecting structures. Same goes for the horse.