September 2324 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 ID: 775328
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Slide1
Skin Appendages: Hair, Nails, Glands
September 23-24 2014
Slide2Skin Appendages
The skin appendages include cutaneous glands, hair, and nails.
Slide3Cutaneous Glands
What is cutaneous? What is an exocrine gland?
Slide4Cutaneous Glands
What is cutaneous? Relating to the skinWhat 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).
Slide5Cutaneous Glands
Sebaceous (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
You’ll be able to identify sebaceous glands on slides by looking for large, roundish glands with a LARGE duct that empties into the hair follicle.
Slide6Cutaneous Glands
Sebaceous (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 follicles
Slide7Acne occurs when the hair follicle is clogged with sebum.
Slide8Cutaneous Glands
Sweat (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!
Slide9Cutaneous Glands
Sweat (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
Thornhill’s work
Notice that sweat glands, since they empty into the skin, are often farther and deeper than sebaceous glands
Slide10Cutaneous Glands – Quick Review
Make a Venn Diagram comparing the three types of cutaneous glands. You may work with a partner.
5 min
Slide11Hair follicle
The 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 loss
Change the words on the diagram of your guided notes
Slide12Hair
Hair 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 hair
Oval shaft = silky, wavy hair
Flat shaft = curly hair
Slide13Nails
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 primates
Slide14Quick Review
Turn & 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.
Slide15Quick Review
Turn & 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.
Slide16Label the diagram
Slide17Label the diagram
A: epidermisB: dermisC: hypodermis1: hair shaft2: pores3: Eccrine gland4: sebaceous gland5: capillary
What did we talk about today that you
don’t
see on this diagram?
Slide18Label the diagram
A: epidermisB: dermisC: hypodermis1: hair shaft2: pores3: Eccrine gland4: sebaceous gland5: capillary
What did we talk about today that you
don’t
see on this diagram?
Apocrine glands.
Slide19Identify the parts of the skin
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