_37_, Inner quarter; _38_, outer quarter; _39_, ground border of wall
(toe); _40_, white line; _41_, sole; _42_, apex of frog; _43_,
lateral ridge of frog; _44_, central furrow of frog; _45_, lateral
furrow between frog and bar; _46_, bar. (After Ellenberger-Baum,
Anat. für Künstler.)
]
[Illustration: