Skin of the sole: the vascular system (indian ink injection)
1. keratinized stratified squamous epithelium: the stratum corneum
1. keratinized stratified squamous epithelium: the stratum corneum
2. toruli tactiles, which provide the pattern of the skin
2. toruli tactiles, which provide the pattern of the skin
3. blood vessels in the connective tissue ridges of the toruli tactiles
3. blood vessels in the connective tissue ridges of the toruli tactiles
4. blood vessels in the dermis (subpapillar plexus)
4. blood vessels in the dermis (subpapillar plexus)
5. sweat gland: the straight segment of the excretory part
5. sweat gland: the straight segment of the excretory part
The two main skin types are: the thin or "hairy" (hirsute), and the thick or "hairless" (glabrous). The best example of the hairy skin is the scalp, its modified forms are the skin with odoriferous glands, e.g. in the axilla (see Fig. [23.01]), and the secondarily hairless areas, e.g the eyelid (see Fig. [24.18]), nose, auricle, nipple and penis (see Fig. [15.19]), where the hair follicles are rudimentary. The primarily hairless skin is found on the palm and sole, and on the corresponding sides of the fingers and toes.
Here the connective tissue forms long dermal ridges not papiIlae, which determine the individual pattern
("fingerprint") of the surface. This skin type adheres tightly to the underlying bone or aponeurosis with connective tissue bundles.