Figt7-цD тhe dtstaI sesаmoid bone: plаntаr andsoEvieu.

n- fleхor digitorums - rerfIсI al i s. lnsertlons

зi5 oroх]mal and middlephalanges

cct I ateral ses amoi deanligament

1oint сapsule of dtstalinterphalangeal joint

lame|lar сoilum of bar

^^^l^ ^' ^^l^ ,.'ilЬal lglc Ul oulе| wlII l

papiIlarу solar corium

m f|eхor digitorumprofu ndus, i nse rti on i nto

semilunar line of distalpnaIanх

Fi9.7.81 The hoof of an unborn foal: lateralview.

long hairs coveringcoronet

keratinised wall of hoof atneel

soft cellular massdeveloped from the frog

of the hoof

Fi9.7.82 The hoof of the unborn foal: solar andplаntar view.

apeх of cellular massdeveloped from the frog

soft cellular massdeveloped from the frog:

central sulcuscrura

peпople

bulb of heel

.'a'..C-aе on plantaresoесt of digit

Removal of the tendon of the deep digita| f|exor musс|e has opened r.lpthe oodotroсh|ear bursa to reveaI the dista| sesamoid bone. PartiaIexсision of the roof of the podotroсh|ear bursa revea|s the synovia| сaviof the dista| interpha|angеa| joint. The сaгtilage сovering thepodotroсhlear surfaсе of the dista| sesamoid bone shows evidenсe ofpathoIogiсal changе (.naviсuIar' disеase).

cartiI age сov e r i ng f|eхortUberositу of middIepnalanх

sуnovial cavitу of distalintеrphalangeal jointехposed bу remova| ofjoint capsule

cartilaginous surf ace ofdistal sesamoid bone

pathological lesioлs indistal sesamoid bone

distal sesamoid imparЛgament

distal phalanх,cutaneous surface

The soft сеIIuIar masses deveIopеd from thе so|e and the frog rapid|y dout aftеr birth, and when wеight is taken on the foot they arе quick|y wolaWaV to eХDose the hard keratinisеd structures beneath (сomoarе withFis 7 3e)

keratinised hard wall othoof at toe

horn tubules separatedfrom intertubular horn atdistal surface of wall

soft cellular massdeveloped from the soleof the hoof

The ovеrgrowth of the ce|lular masses derived from the angIe of thе solrand f rom the f rog hide the inf|eсted paгts of the wa|| (the bars). Whеn thfoa| begins to wa|k' however, the soft tissues dry and arе Worn away. Ttso|ar surfaсe of the hoof ouiсklv beсomes Iikе that of the adu|t horse(see Fig.7.9).

soft cellular massdeveloped from sole olhoof

horn tubules separatedlrom intertubular horn atdistal surface of wall

hard keratinised wall ofhoof

long hairs coveringcoronet42