Biology 205 : Chapter 5 ( Integumentary system )
Stratum Granulosum
"Grainy layer* 3-5 layers of Keratinocytes most cells *stop dividing here* & start making *keratin* plasma membrane thickens, organelles disintegrate , cell dies PROTEIN LAYER FORMS #3
Stratum Basale(germanitivum)
- Kerantinocytes undergo *mitosis* ever *19 days* columnar cells *melanocytes* located here secrete basement lamina #1
Stratum Corneum
-25+ layers of *dead cornified* cells (SURFACE LAYER) Soft keratin - skin hard keratin- hair *fat soluble* will diffuse through this layer
Apocrine
Body odor empty into hair follicle lactation is this type of secretion
ear wax
Cerumen is produced by glands located in the __________.
Cleavage lines
Collagen & elastin fibers arranged in bundles oriented to resist forces applied to skin during normal movement are called _______ lines
Dermis
Dense Irregular connective tissue 2 layers : *Reticular* & *Papillary* Macrophages
Merkel cells
Found in Skin surfaces that *lack hair* combines with *tactile* disc , sensitive to touch when compressed , release chemicals
Stratum lucidum
Found only in "thick" skin , appears glassy transparanet thin layer covers *palms and soles* #4
Stratum basale,
In which layers of the epidermis do mitotic divisions occur?
Papillary layer
Layer that gives *finger & foot prints* Consist of *Aerolar* tissue contains: capillaries, lymphatic vessels, sensory neurons papillae provide *grip* and *friction* # 2
Reticular Layer
Lies *deep* to Papillary layer contains: Collagen and elastic fibers Accessory structures: hair follicles, sweat glands, *blood vessels* and *nerves*
palms of hand
Merocrine sweat glands are most abundant in the __________.
Stratum Spinosum
Named for appearance on slides 8-10 layers *keratin* production little cell division contain *langerhans cells* ( defense against superficial penetration)
Cutaneous plexus
Plexus lies along border of hypodermis w/ reticular layer of dermis tributaries of arteries supply *adipose tissues of subcutaneous*
subpapillary plexus
Plexus provides arterial *blood* to capillary loops that follow the contours of the *epidermis-dermis boundary*
Reticular layer
The dermal layer primarily responsible for the strength of the skin is the __________ layer.
Stratum Corneum
The epidermal layer that consists almost entirely of keratin is the __________ #5
Stratum Corneum & Stratum lucidum
The epidermis has several layers. Which layers of the epidermis would be different in thick skin compared to a sample of thin skin?
areolar and dense irregular connective
The hypodermis is composed of __________ tissues.
B.)germinativum, spinosum, granulosum, corneum
The layers of the epidermis, beginning with the deepest layer and proceeding outward, include the strata __________. A.) spinosum, germinativum, corneum, granulosum B.)germinativum, spinosum, granulosum, corneum C.)granulosum, spinosum, germinativum, corneum D.)corneum, granulosum, spinosum, germinativum
Dermal papilla
The skin layer just beneath the stratum basale is the __________ layer.
Stratum lucidum
Which epidermal layer is found only in thick skin? #4
The melanocytes grow rapidly and metastasize through the lymphatic system.
Why are malignant melanomas extremely dangerous and life-threatening?
Merocrine
also called *Eccrine* empty onto skin surface temp regulation type of serous secretion