Download to read offline
Uploaded byDr. Alok Kumar
Integumentery System
The skin is the largest organ of the body, covering the entire surface. It consists of two main layers - the epidermis and dermis. The epidermis is composed of stratified squamous keratinized epithelium and overlies the dermis, a dense connective tissue layer derived from mesoderm. Embedded within the dermis are structures like sweat glands, sebaceous glands and hair follicles which develop from the epidermis during embryogenesis. Skin lines various cavities and becomes continuous with mucous membranes in areas like the lips, anus, nose and urogenital regions.
More Related Content
![Skin anatomy chc training 2012 [compatibility mode] [repaired]](https://cdn.slidesharecdn.com/ss_thumbnails/skinanatomychctraining2012compatibilitymoderepaired-131009014235-phpapp01-thumbnail.jpg?width=640&height=640&fit=bounds)
Similar to Integumentery System
Integumentery System
- 2. The integument, composedof skin and its appendages-the sweat glands, sebaceous glands, hair, and nails-is the largest organ of the body, constituting 16% of body weight. It invests the entire body, becoming continuous with the mucous membranes of the digestive system at the lips and the anus, the respiratory system in the nose, and the urogenital systems where they surface.
- 3. Additionally, the skinof the eyelids becomes continuous with the conjunctiva lining the anterior portion of the orb. Skin also lines the external auditory meatus and covers the external surface of the tympanic membrane.
- 9. • Skin consistsof two layers: an outer epidermis and a deeper connective tissue layer, the dermis. • The epidermis is composed of an ectodermally derived stratified squamous keratinized epithelium. • Lying directly below and interdigitating with the epidermis is the dermis, derived from mesoderm and composed of dense, irregular collagenous connective tissue.
- 10. • The hypodermis,a loose connective tissue containing varying amounts of fat, underlies the skin. The hypodermis is not part of the skin but is the superficial fascia of gross anatomical dissection that covers the entire body, immediately deep to the skin.
- 11. Cells of epidermis •1.Keratinocytes • 2.Melanocytes • 3.Intraepithelial macrophages • 4.T-lympocytes • 5.Merkel’s cells
- 17. • Dermis (Corium)The dermis, the layer of skin immediately deep to the epidermis, is derived from mesoderm and comprises a loose papillary layer and a deeper, denser reticular layer. The region of the skin lying directly beneath the epidermis, called the dermis, is derived from the mesoderm and is divided into two layers: the superficial, loosely woven papillary layer and the deeper, much denser reticular layer.
- 22. • Sweat glands,sebaceous glands, and hair follicles, all derived from the epidermis, invade the dermis and hypodermis during embryogenesis, where they remain permanently. Groups of smooth muscle cells are located in the deeper regions of the reticular layer at particular sites such as the skin of the penis and scrotum and the areola around the nipples; contractions of these muscle groups wrinkle the skin in these regions.
- 23. Hair • 1.Number-100000 onthe head; • 2.Length is 1mm-1,5-2,0m. • 3.Speed of growth is 0,3-0,4mm a day. • a)testosterone stimulates growth of hairs on the face(mustache, beard). • b)cytokines stimulate growth of the hair. • c)haircutting, shaving don’t influence on to speed of growth and number of hairs. • 4.Duration of life-several months to 2-6 years. • 5.One hair is replaced by the new one(during all the life replacement of several millions of hairs).