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562 DENTAL EMBRYOLOGY AXD HISTOLOGY.
The epithelial cells found in sweat-glands are polyhedral or cuboidal in
form. Their office, implied in their name, is too well known to need
further explanation.
Fig. 308.
^ert ca Section of the Skin of the Thumb, partly diagrammatic: o, stratum cor>,eum, traversed bv
ducts of t\\o glands; h, rete niucosum, with j.roloiigations extending between papilla beneath;
between n and /, is seen the stratum luci.lum
; r, papillary layer of corium. Near the centre of
the hgure is seen a i.ictile corpuscle;
,1, reticular layer of c'.rium with vascular plexus nucleated
'"^'^'^P'*''^*'' '"' ''""'* '''' '«"'• ««eat-glands ; /, fat-globules iu the meshes of
thrconn^ctil^'usMie
Derelopmeni of the Enamel Organ.—The development of this organ
differs but very little from that of the hair-follicle.
This is especially
true of the enamel organ of the permanent molars, the cords for Avhich
arise directly from the epithelial layer of the mucous membrane of the
