Page 138 - My FlipBook

148 ANAT03IY.

cle, fibrous (cortical), and medullary portions, though the latter is not
always present.
The Cuticle is the outer or investing membrane of the hair, firmly-
binding its bundles of fibres together. Under the microscope this mem-
brane is seen to be composed of fine imbricated scales. The upper edges
of these project and form fine transverse wave-like lines. They are
without nuclei, and are analogous to the upper cells of the corneous
layer of the epidermis, and perform a like function for the hair.
The Fibrous or Cortical Portion.—The bulk of the hair is made up
of this substance ; it is translucent, and is arranged in longitudinal
Fig. 75.

Lowov portion of Hair pouch from the lip of a kitten r, follicle , T, tnns\ er^e sections of connectivo-
tissue bundles of derma; M, arrector pili muscle; Is, inner root-sheath; OS', outer root-sheath;
I', papilla ; C, cuticle ; 11, root of hair ; II, hyaline or so-called structureless membrane (magnitied
500 diameters).
bundles containing oblong patches of pigment-granules and other color-
ing matter of less intensity.
The fibres which make up the bundles composing this portion are
subdivided into flattened fusiform cells with slender elongated nuclei,
which are distinctly visible when certain reagents are used. There are