. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. INTEGUMENT. 25 ceous glands (Fig. 14, HBD], are in connection with each hair-sac, the latter serving to oil the SA. , w ' v' ''/'i, ( '' -' ' •- -' * "•-,' ',*'i // ;• •jj v;:.;F/ -rt 1 I Hi •""'-:.?-?": '.•• ';v/'^v^/i- FIG. 14. — LONGITUDINAL SECTION THROUGH A HAIR. (Diagrammatic.) »SV, stratum corneum ; ^J/, stratum Malpighii ; Co, derma ; Ap, arrectores pili ; Ft, adipose tissue ; F, outer longitudinal layer, and F1, inner transverse layer of dermic coat (both comp
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. INTEGUMENT. 25 ceous glands (Fig. 14, HBD], are in connection with each hair-sac, the latter serving to oil the SA. , w ' v' ''/'i, ( '' -' ' •- -' * "•-,' ',*'i // ;• •jj v;:.;F/ -rt 1 I Hi •""'-:.?-?": '.•• ';v/'^v^/i- FIG. 14. — LONGITUDINAL SECTION THROUGH A HAIR. (Diagrammatic.) »SV, stratum corneum ; ^J/, stratum Malpighii ; Co, derma ; Ap, arrectores pili ; Ft, adipose tissue ; F, outer longitudinal layer, and F1, inner transverse layer of dermic coat (both composed of connective-tissue) ; Seh, hair-shaft ; Af, medulla ; R, cortex ; 0, cuticle of shaft ; irS, JI'S1, external and internal root-sheath, — the latter reaches above only as far as the point of entrance of the ducts of the sebaceous glands (HJ3D) ; HP, hair-papilla, containing vessels ; Gil, hyaline layer, which lies between the inner and outer hair-sheaths, i e. , between the root-sheath and the follicle (dermic coat). As feathers are arranged in definite tracts, so also hairs are disposed more abundantly on some parts of the body than on others. 1 The arrectores pili have also the function of compressing the glands, though the latter are provided with muscles of their own, the development of which is in inverse proportion to that of the proper Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, New York, Macmillan
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