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A&P Lab 2 WK2
A&P Lab 2 Week 2 Integumentary System
| Term | Definition |
|---|---|
| Epidermis: | outermost layer of the skin, stratified squamous epithelium (consists of multiple layers of flattened cells |
| Epidermis Function: | serve as a protective barrier. shields the body from environmental hazards ((UV) radiation, bacteria, containing melanin to filter UV rays) |
| Inside the Epidermis: superficial to deep - | corneum, lucidum, granulosome, spinosum, basal |
| Stratum Basale: | fifth and deepest layer of the skin with the darkest blue layer - rests on the basement membrane |
| Stratum Spinosum: | fourth layer of the epidermis, (blue layer) |
| Stratum Granulosum: | middle layer of the epidermis, (has two layers: white layer and light blue) |
| Stratum Lucidum: | second most superficial layer of the skin (yellowish color) |
| Stratum Corneum: | most superficial layer of the skin (what is visible to the outside), peach and light pink flesh color layer (has two) |
| Baby Skin Gets Loving Care: from deep to superficial: | Stratum Basale, Stratum Spinosum, Stratum Granulosome, Stratum Lucidum, and Stratum Corneum |
| Dermis: | middle layer of the skin, dense irregular connective tissue - below the epidermis |
| Dermis Function: | providing structural strength and flexibility to the skin, housing blood vessels, nerves, hair follicles, and glands for thermoregulation, sensation, and protection, and supporting the epidermis. |
| Inside the Dermis: | papillary layer and reticular layer which is the middle section of the diagram, |
| Papillary Layer: | outer layer of the dermis, located directly beneath the epidermis and above the thicker reticular layer. - Thin zone of areolar tissue (loose connective tissue) in and near the dermal papillae |
| Dermal Papillae: | Bumpy flesh color underneath the stratum basal layer of the epidermis - uppermost layer of the dermis - bumps on top of the dermis, extensions of the dermis: are upward, finger-like extensions of the dermis |
| Tactile/Merkel Cells: | reddish/pimple bumps within the dermis - in the stratum basale layer - Tough receptor cells associated with dermal nerve fibers |
| Free Nerve Endings: | yellow nerve like structures in the epidermis/dermis - unencapsulated sensory receptors in the skin that detect pain, temperature, itch, and light touch |
| Reticular Layer: | deeper, thicker layer of dermis below the papillary layer - extended down to teh fatty tissue/subcutaneous layer - Composed of dense irregular connective tissue - makes skin stretchy and strong |
| Lamellated Corpuscle: | green lined oval shaped figure attached to yellow cloud figure -in dermis & hypodermis, loose connective tissue throughout body. - responsible for sensing deep pressure, high-frequency vibrations by responding to sudden, transient disturbances. |
| Skin Accessories: | Hair, nails, and cutaneous glands are the accessory organs (appendages) of the skin - Hair and nails are composed of mostly dead, keratinized cells |
| Hair follicle: | purple L shaped figure attached to purple cloud (sebaceous gland) and red tube (arrector pili muscle) - A slender filament of keratinized cells growing from a tube in the skin |
| Hair shaft: | black singular hair above the epidermis/surface portion of hair seen above the skin surface |
| Arrector pili muscle: | red tube attached to purple L shaped figure (hair follicle) - in skin's dermis, attached to hair follicles and the overlying epidermis - (involuntary response) causes hairs to stand on end, creating "goosebumps" through a process called piloerection |
| Apocrine gland (sweat gland): | yellow brain like figure leading to the stratum lucidum - usually associated with hair follicles, coarse hair - Groin, anal region, axillia, areola, beard area in men |
| Eccrine/Merocrine gland (sweat gland-nervous sweats): | white dollop figure leading to the stratum spinosum - mostly simple cuboidal - especially dense on palms, soles, and forehead - produce water perspiration that helps cool the body |
| Sebaceous gland: | purple cloud figure attached to purple L shaped figure (hair follicle) Produces oily secretion (sebum) |
| hypodermis (also known as the subcutaneous tissue,) | innermost layer of the skin that lies beneath the dermis and epidermis. function:storing fat for energy/insulation, absorbing shock to protect underlying muscles and bones, and connecting the skin to the body's deeper structures. |
Created by:
Katepop10