Karteikarten
Th3L06 Glands and hair follicles
Karten in diesem Stapel (38)
- 1What are the skin appendages?Sweat glands, hair follicles, arrector pilli muscle, sebaceous glands
- 2What type of gland are sweat glands?Exocrine and merocrine (unbranched and tubular)
- 3What are sweat glands important for?Thermoregulation (evaporation of sweat)
- 4Sweat glands are innervated by what?Sympathetic nervous system
- 5Describe the secretory portion of sweat glands:* Highly coiled
* Singe layer of cuboidal cells + layer of myoepithelial cells - 6Where is the secretory portion of sweat glands located?at junction of dermis and hypodermis
- 7What does the secretory portion of sweat glands produce?isotonic fluid
- 8Describe the excretory duct* Straight course through dermis
* Corkscrew through epidermis
* Stratified cuboidal cells
- 9What is the role of excretory duct?Absorbs NaCl to produce hypotonic sweat
- 10Where are apocrine sweat glands found?Axilla (armpit) and genital regions
- 11Apocrine sweat glands discharge into where?Hair follicles
- 12What do the apocrine sweat glands discharge?Sticky, milk fluid that becomes odiferous by microbial action
- 13When do the apocrine sweat glands come functional?During puberty
- 14What is the mode of secretion for apocrine sweat glands?Release of membrane-bound vesicles rich in lipid
- 15What are the modified apocrine sweat glands?Mammary glands
- 16Where do sebaceous glands discharge into?middle portion of hair follicles
- 17What do the sebaceous glands secrete?Sebum
- 18What is sebumLipid rich secretion that maintains suppleness of skin
- 19What kind of gland are sebaceous glands?Exocrine, holocrine glands
- 20What are arrector pili muscle?Bundle of smooth muscle that inserts into the connective tissue sheath around the hair follicle and into the papillary layer of dermis
- 21What is the role of arrector pili muscle?* Raising hair
* Vestigial importance in man > goosebumps - 22Hair follicles arise as what?down growth of epidermis
- 23Keratinocytes of the hair bulb differ from the other keratinocytes in that? (2)* They follow different differentiation pathways
* Concentric rings or cells with different morphologies - 24Describe the structure and location of Central medulla (hair follicle):* Location
* Centre of the hair only in thick hair
* Lightly keratinised, large cells
- 25Describe the structure and location of Cortex (hair follicle):* Location
* Outer, third layer, surrounds the cortex
* Very heavily keratinised scales
- 26Describe the structure and location of Inner root sheath (hair follicle):* Location
* Surrounds the hair, towards base of hair follicle
* Degenerates at level of sebaceous glands, forms a space into which sebum is discharged
- 27Describe the structure and location of Outer root sheath (hair follicle):* Location
* Surrounds inner root sheath
* Doesn't take part in hair formation; continuous with epidermis and contains reservoir of stem cells able to regenerate the epidermis
- 28Describe the structure and location of Glassy membrane (hair follicle):Layer of connective tissue that surrounds the base of the hair follicle, connecting it to the dermis
- 29What is key to the differences between layers of the hair follicle?Hair papilla
- 30What are hair papilla?Specialised aggregation of connective tissue cells
- 31What is the role of hair papillaInductive role in directing hair formulation
- 32When do hair papilla form AND what happens if they are destroyed?* Forms only one during development
* If destroyed, hair cannot grow back - 33Hair growth should be described as what?Intermittent
- 34Growth phase for scalp?Years
- 35Quiescence phase for scalp?3 months
- 36What is a quiescent follicle?Club hair
- 37Growth phase for body hair?Months
- 38Quiescence phase for body hair?Years
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- Beschreibung
- Medicine Y1 (Theme 3 | Tissues and systems) Karteikarten am Th3L06 Glands and hair follicles, erstellt von Emma Allde am 08/09/2016.
- Erstellt von
- Emma Allde
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