Describe the basic structure and function of epidermal derivatives such as hair, nails, sweat, sebaceous and ceruminous glands.

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Explanation:

===> HAIR:

Basic structure: out of follicles the hair grows and contains mostly keratin(more than 90 percent of keratin composition). The hair has three(3) divisions or layers; the innermost layer which is also known as the medulla layer which is soft in texture, the middle layer which is also known as the cortex which is the centre for strength and the outermost layer known as cuticle.

function: hairs help in protect and insulation of the body. The hair also helps to control body temperature.

===> NAILS:

Basic structure: the nail can be classified into many parts but the main parts are three, namely: nail bed are in the skin, nail matrix which contains blood vessels and nail plate which is the hardest part of the nail.

Function: nails can be used for pinching and protection and covering some part of the body.

===> SWEAT GLAND:

Basic structure:

Consist of tubes or units that transport sweat out of the body. The sweat gland is located deep in the skin.

Function: used in the regulation of body temperature.

===> SEBACEOUS GLAND:

Basic structure: sebaceous gland can occur independently and they can also occur dependently by connecting with the hair follicles. Sebaceous gland release sebum.

Function: helps in regulating body temperature.

===> CERUMINOUS GLAND:

Basic structure: they are found in the auditory part of the body --the ear especially in the exterior ear canal. They consist of tubules.

Function: for lubrication and for the protection of the ear canal.

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