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Parts of two hairs embedded in their follicles. Labels: a, the skin, which is seen to dip down and line the follicle; b, the subcutaneous tissue; c, the muscles of the hair follicle, which by their contraction can erect the hair; o, sebaceous gland.

Hairs and their Follicles

Parts of two hairs embedded in their follicles. Labels: a, the skin, which is seen to dip down and line…

Diagram showing the layers of the scalp and membranes of the brain in section. Labels: a, skin; b, subcutaneous tissue with hair roots and vessels; c, epicranius; d, subepicranial layer; e, pericranium; fm parietal bone; g, dura mater; k, arachnoid; l, pia mater; m, cortex; n, in subdural space near a Pacchionian body projecting within the superior longitudinal sinus.

Layers of the Scalp and Membrane of the Brain

Diagram showing the layers of the scalp and membranes of the brain in section. Labels: a, skin; b, subcutaneous…

Section of the skin showing the hairs and sebaceous glands. The sebaceous glands are small saccular glands, the ducts of which open into the hair follicles. They are lined with epithelium and secrete a fatty, oily substance which they discharge into the hair follicles to lubricate the hairs and make them glossy. It also exudes over the surface of the skin to keep it soft and flexible. Labels: a, the epidermis; b, corium; c, muscles, attached to hair follicles and to under surface of epidermis.

Section of Skin Showing Hairs and Sebaceous Glands

Section of the skin showing the hairs and sebaceous glands. The sebaceous glands are small saccular…

Developing skin showing later stages of formation of hair follicles; surrounding mesoblast is forming hair papilla and fibrous sheath of follicle.

Developing Skin Showing Hair Follicles

Developing skin showing later stages of formation of hair follicles; surrounding mesoblast is forming…

Sections of developing skin, showing earliest stages in formation of hair follicles; in D epithelial cylinder is invading mesoblast.

Developing Skin

Sections of developing skin, showing earliest stages in formation of hair follicles; in D epithelial…

Vertical section through the skin of the trunk in the region of the arch of the ribs. One of the small hairs is seen in longitudinal section.

Section of the Skin

Vertical section through the skin of the trunk in the region of the arch of the ribs. One of the small…