Z331 Fall 2010 Ecampus Week 9 and 10 Integument Lecture 3 Accessory Structures Posted

Z331 Fall 2010 Ecampus Week 9 and 10 Integument Lecture 3 Accessory Structures Posted

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Weeks 9 and 10: Lecture 3: Chapter 5:  The Integumentary System: Accessory  Structures
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Integumentary Accessory  Structures Hair, hair follicles,  sebaceous glands,  sweat glands, and  nails: are epidermal  structures (derived  from embryonic  epidermis)  are located in  dermis project through the  skin surface Figure 5–1, 154; 5-12, 169
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Hair The human body is  covered with hair,  except : palms, soles,  lips and portions of  external genitalia Protects and insulates Guards openings  against particles and  insects Is sensitive to very  light touch http://upload.wikimedia.org/wikipedia/commons/thumb/0/ 0b/Ear_hair.jpg/800px-Ear_hair.jpg http://www.pjlighthouse.com/wp-content/uploads/2007/02/ britney_spears_shaving-hair-bald.jpg http://www.cookiemag.com/images/style/2006/09/stsl01_l onghair.jpg
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Types of Hairs Lanugo hair – fetus  and newborn  Vellus hairs: (peach  fuzz) soft, fine  cover body surface Terminal hairs:  heavy, pigmented head and eyebrows other parts of body  after puberty http://www.answers.com/topic/androgenic-hair http://www.ocf.berkeley. edu/~bsl/images/sixmont hs.jpg http://www.pg.com/science/haircare/hair_twh_9/ima ge004.jpg http://neatorama.cachefly.net/images/2007- 04/woman-long-hair.jpg
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The Hair Follicle Is located deep in dermis Produces nonliving hairs Is wrapped in a dense connective-tissue sheath Base is surrounded by sensory nerves (root hair plexus)
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This note was uploaded on 02/15/2011 for the course ZOOLOGY 331 taught by Professor Amyharwell during the Fall '10 term at Oregon State.

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Z331 Fall 2010 Ecampus Week 9 and 10 Integument Lecture 3 Accessory Structures Posted

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