COMMON INTEGUMENT 899 
periople surrounds the coronary border in the form of a flat band, which is about 
half an inch wide, except at the heels, where it widens to cover the entire surface. 
The wall forms most of the abaxial part of the claw and is reflected in front upon the 
interdigital surface. It thins out toward the bulb or heel, which appears, as stated 
above, to consist of the thin expansion of the periople. The sole occupies the angle 
of inflection of the wall; it is continuous without demarcation with the periople of 
the bulb. The perioplic corium bears relatively long papillae. The coronary corium 
is much less developed than in the horse and its papille are short. The lamin are 
much narrower and are more numerous than in the horse; secondary lamine are 
not present. The corium of the sole is not marked off behind from that of the 
periople; its papillze are very small and close together. The corium of the bulbs 
Lateral extensor tendon : 
Upper pouch 
of metacarpo- 
/phalangeal 
joint capsule 
Superficial 
flexor tendon 
Suspensory 
baa SS 
igament 
Deep flexor 
tendon 
\ Supe rficial 
flexor tendon 
Annular 
ligament 
Proximal 
sesamoid 
Cruciate 
ligament 
Small claw 
Annular ligament 
Digital cushion 
Upper pouch of capsule 
of distal interphalangeal 
joint 
Distal sesamoid bone 
Metacarpal bone 
Metacarpo-phalangeal articulation 
First phalanx 
Lateral extensor tendon 
Common extensor tendon 
Proximal interphalangeal joint 
Second phalanx 
Periople 
Coronary corium 
Third phalanx 
Wall of hoof Bursa 
is separated from the flexor tendon by a mass of elastic, fatty tissue, which is 
analogous with the digital cushion of the horse. The papille here are long and 
often compound. 
The accessory digits bear short conical horn capsules which resemble in a 
general way those of the chief digits, and have a similar corium, which covers one 
or two nodular vestigial phalanges. From these a fibrous band descends obliquely 
on the volar aspect of each chief digit and is attached below to the distal phalanx 
and sesamoid bones, sending fibers also to the elastic pad of the heel. 
The horns (Cornua) enclose the horn processes of the frontal bones (except in 
the polled breeds). They vary very greatly in size, form, and curvature. The root 
or base of the horn (Radix cornus) has a thin edge which is continuous with the 
