chapter 5 skin histology epidermal derivatives j.f. thompson, ph.d
TRANSCRIPT
![Page 1: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/1.jpg)
Chapter 5Skin Histology
Epidermal Derivatives
J.F. Thompson, Ph.D.
![Page 2: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/2.jpg)
Hair Distribution Varies Over the
Body Surface
![Page 3: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/3.jpg)
Hair Follicles
![Page 4: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/4.jpg)
Hair Anatomy• Shaft
– medulla - inner layer– cortex - middle layer, pigments, air spaces– cuticle - outermost layer, hard keratin
• Root– similar to shaft, but within dermis
• Follicle - surrounds root
• Sheath - supports shaft & root
• Bulb - enlarged layered structure at base where hair is generated– papilla - areolar connective tissue, blood
vessels supply nutrients– matrix - germination layer of papilla
(stratum basale) builds hair shaft
• Sebaceous glands – release oil
• Arrector Pili – smooth muscle
![Page 5: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/5.jpg)
Hairs & Lice
egg
headlouse
crab louse
![Page 6: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/6.jpg)
Arrector Pili (smooth muscle)
![Page 7: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/7.jpg)
Sweat Glands
![Page 8: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/8.jpg)
Sebaceous Glands
![Page 9: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/9.jpg)
Nails• tightly packed, hard,
keratinized cells• nail matrix - under root
of nail– site of nail growth– transforms normal skin
cells into nail cells which push forward
– 1mm/week in fingers; slower in toes
– the longer the finger the greater the growth rate
![Page 10: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/10.jpg)
Nails• Tightly packed cells with
hard keratin
• Nail matrix - under root of nail– site of nail growth– transforms normal skin
cells into nail cells which push forward
– 1mm/week in fingers; slower in toes
– the longer the finger the greater the growth rate
![Page 11: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/11.jpg)
Hypodermis
![Page 12: Chapter 5 Skin Histology Epidermal Derivatives J.F. Thompson, Ph.D](https://reader035.vdocuments.net/reader035/viewer/2022062315/5697c0271a28abf838cd642e/html5/thumbnails/12.jpg)
End Ch 5
Skin HistologyEpidermal Derivatives