. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 24 COiiPARATIVE AXATOMY medulla, cortex, and cuticle (Fig. 16 A), all of which are formed from cells. The follicular tissue, which is richly provided with blood-vessels, extends into the bulb-like base or root of the hair- A /^/'. Fig. —Diagrams ov Four Stages (A-D) in thk Development of HAm--^. (After F. Maurer.) ,Sr, stratum corneiim ; S^f, stratum Malpighii, which gives rise to an epithelial knob at Ep ; this grows inwards into the dermis (C) ; F, rudiment of the hair- follicle ; HP, hair-papilla ; UK, hair-bulb
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 24 COiiPARATIVE AXATOMY medulla, cortex, and cuticle (Fig. 16 A), all of which are formed from cells. The follicular tissue, which is richly provided with blood-vessels, extends into the bulb-like base or root of the hair- A /^/'. Fig. —Diagrams ov Four Stages (A-D) in thk Development of HAm--^. (After F. Maurer.) ,Sr, stratum corneiim ; S^f, stratum Malpighii, which gives rise to an epithelial knob at Ep ; this grows inwards into the dermis (C) ; F, rudiment of the hair- follicle ; HP, hair-papilla ; UK, hair-bulb ; Dr, rudiment of the sebaceous gland. In 1), / indicates the stratum lucidum with eleidin-granules in the cells. shaft, and gives rise to the huir-i)apilla. From this region a new hair-shaft may develop when the hair is shed, periodically or non- periodically as the case may be, often by the formation of a new papilla. The colour of the hair is due to three causes:—Firstly,. 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, William Newton, 1857-1923. London, Macmillan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
