skin appendages: hair, nails, glands

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Skin Appendages: Hair, Nails, Glands. September 23-24 2014. Skin Appendages. The skin appendages include cutaneous glands, hair, and nails. Cutaneous Glands. What is cutaneous? What is an exocrine gland?. Cutaneous Glands. What is cutaneous? Relating to the skin - PowerPoint PPT Presentation

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Skin Appendages: Hair, Nails, GlandsSeptember 23-24 2014Skin AppendagesThe skin appendages include cutaneous glands, hair, and nails.

Cutaneous GlandsWhat is cutaneous?

What is an exocrine gland?

Cutaneous GlandsWhat is cutaneous? Relating to the skin

What is an exocrine gland? A gland that releases its product to a particular site, rather than into the blood stream. (Endocrine glands release their products to the blood).

Cutaneous GlandsSebaceous (oil) glandsFound everywhere except palms of hands and soles of feetThe ducts mostly empty into hair folliclesProduce oily product called sebumFunctions:Keep hair and skin from drying outKill bacteriaBecome much more active in adolescence

Youll be able to identify sebaceous glands on slides by looking for large, roundish glands with a LARGE duct that empties into the hair follicle.Cutaneous GlandsSebaceous (oil) glandsFound everywhere except palms of hands and soles of feetThe ducts mostly empty into hair folliclesProduce oily product called sebumFunctions:Keep hair and skin from drying outKill bacteriaBecome much more active in adolescence

Fun fact: the pores on our faces are actually hair folliclesAcne occurs when the hair follicle is clogged with sebum.

Cutaneous GlandsSweat (sudoriferous) glandsEccrine glands produce sweat (water, salt, urea, lactic acid)Duct lead to pores in skinFunctionsThermoregulation ExcretionBacterial inhibition (sweat is acidic)Apocrine glands produce a milky secretion fully of fatty acids and proteins. Small duct leads to hair follicleFunction: Pheromone!

Apocrine glands active after puberty and during stress/pain/ sexual activity8Cutaneous GlandsSweat (sudoriferous) glandsEccrine glands produce sweat (water, salt, urea, lactic acid)Duct lead to pores in skinFunctionsThermoregulation ExcretionBacterial inhibition (sweat is acidic)Apocrine glands produce a milky secretion full of fatty acids and proteins. Duct leads to hair follicleFunction: Pheromone!

Fun fact: Randy Thornhills workNotice that sweat glands, since they empty into the skin, are often farther and deeper than sebaceous glands Apocrine glands active after puberty and during stress/pain/ sexual activity9Cutaneous Glands Quick ReviewMake a Venn Diagram comparing the three types of cutaneous glands. You may work with a partner.

5 minHair follicleThe hair follicle is surrounded by a thin layer of epidermal tissue.

The follicle is slanted unless the arrector pili muscles are contracted

Dermal epidermal hair bulb Why/when do the arrector pili muscles contract? The arrector pili muscles contract when we are cold, to raise the hairs and reduce heat lossChange the words on the diagram of your guided notesHairHair can be divided into the shaft (part outside of body) and root (inside body)Hair is produced by epithelial cells in the hair bulb, but as the cells are pushed away from the bulb they begin to die.Like the outer layer of the skin, the hair shaft is composed of dead, keratinized cells.

Fun fact: Round shaft = straight, coarse hairOval shaft = silky, wavy hairFlat shaft = curly hairNails Produced by epithelial cells The nail root, closest to the nail matrix, is living The outer part, like the hair and skin, consists of dead keratinized cells.

Fun fact: Fingernails are a derived trait in primatesQuick ReviewTurn & Talk. Be prepared to share with the class.

Are the skin appendages (cutaneous glands, hair, hair follicles, and nails) found in the dermis or epidermis? Justify your answer.Quick ReviewTurn & Talk. Be prepared to share with the class.

Are the skin appendages (cutaneous glands, hair, hair follicles, and nails) found in the dermis or epidermis? Justify your answer.

They are in the epidermis, because the epidermis surrounds and gives rise to these structures. However, these structures usually sit deeper than the most of the epidermal tissue.Label the diagram

Label the diagramA: epidermisB: dermisC: hypodermis1: hair shaft2: pores3: Eccrine gland4: sebaceous gland5: capillary

What did we talk about today that you dont see on this diagram?Also visible on this diagram are root hair plexus (nerve endings) and arrector pili muscle. You cant see apocrine glands17Label the diagramA: epidermisB: dermisC: hypodermis1: hair shaft2: pores3: Eccrine gland4: sebaceous gland5: capillary

What did we talk about today that you dont see on this diagram? Apocrine glands. Also visible on this diagram are root hair plexus (nerve endings) and arrector pili muscle. You cant see apocrine glands18Identify the parts of the skin

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