anatomy presentation lecture no 2 integumentary system

Introduction of integumentary system
Anatomy lecture
General Anatomy

1. I ntegumentary S ystem Dr. Maria

2. Integumentary system Consists of skin and appendages Hair nails sebaceous glands and sweat gland

3. Functions Protection Temperature regulation Excretion Synthesis Sensory perception

4. Skin Largest organ Cover all body At opening? 2 main parts Epidermis : stratified squamous epithelium Dermis : connective tissue

5. Epidermis Superficial layer 5 layers Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale

6. Corneum Dead cells Keratin Offer resistance Cells are constantly shed off

7. Epidermis Mitotic activity Has no blood supply Obtain nutrients by diffusion Dead cells Deep layers: melanocyte Determine color Black have more quantity of melanin

8. Dermis Corium Beneath the epidermis Connective tissue 2 layers Papillary layer Reticular layer

9. It contains Blood vessels Nerves Nerve endings Hair follicles Sebaceous glands Sweat gland

10. Cleavage lines Faint linear clefts Direction of collagenous fibers Fibers ------parallel Longitudinal in limbs Circular in neck and trunk Incision? Parallel? Across?

11. Langer’s lines—1861 kraissl’s lines__1951

12. Appendages of skin Hair: Thread like Dead cornified cells Shaft Root Hair follicle Hair bulb Erector pilli

13. Constantly shed and replaced Rest period Scalp hair life 3-5 years Eyelash and eye brow hair 3-5 months

14. Nails Dorsal aspect of distal fingers 3 parts Root hidden (nail fold) Body rests on nail bed Free edge Thick layer of skin b eneath the nail root is matrix Finger nail growth 0.5mm/wk

15. Sebaceous gland In the dermis Ducts open into hair follicle Produce sebum Lubrication

16. Sweat glands Most numerous in palms and soles Secretary portion in the form of long tube Tube coiled to form a ball Ducts run through the dermis Joins the epidermis Reaches the skin Sweat pores Produce sweat Evaporation helps to cool the body