text: The wall of this structure is produced from cells lining the perioplic and coronary grooves.
full_question: The wall of this structure is produced from cells lining the perioplic and coronary grooves. The pastern is found between the fetlock and this structure encasing the coffin bone, and a wedge-shaped glandular region between the bars called the frog helps to spread two other components when it is loaded. Excessive drying or injury to the coronet may lead to heel crack in this structure. A stone bruise on the sole of this structure can cause lameness. In Artiodactyla, two smaller types of this structure called dew claws usually appear along with its cloven form. In some odd-toed ungulates it is cared for by farriers. For 10 points, name this thick, keratinous covering on the toes of animals such as horses.
first_sentence: The wall of this structure is produced from cells lining the perioplic and coronary grooves.
raw_answer: hoof [prompt on feet, claws, and nails; prompt on toe until it is read] 