Ch. 5 Integumentary
Terms
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- Skin and its accesory structures-hair, nails, along with various glands, muscles, and nerves?
- Integumentary System
- Covers the external surface of the body, is the largest organ of the body (in both surface area & weight)?
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Skin or cutaneous membrane
-22 sq. ft.
-10-11 lb. - The superficial, thinner portion of the skin composed of epithelial tissue is the?
- epidermis
- The deeper, thicker connective tissue part is the?
- dermis
- Deep to the dermis, but not part of the skin, is what layer?
-
subcutaneous layer (subQ)
-AKA: hypodermis - What layer consists of fascia, adipose tissue and blood vessels?
- hypodermis
- Composed of keratinized stratified squamous epithelium?
- Epidermis
- What are the four types of cells found in the epidermis?
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1.keratinocytes
2.melanocytes
3.Langerhans cells
4.Merkel cells (disc.) - Arranged in 4 or 5 layers and produce the protein keratin?
- keratinocytes
- Develop from the ectoderm of a developing embryo & produce the pigment melanin?
- melanocytes
- A yellow-red or brown-black pigment that contributes to skin color & absorbs damaging UV light?
- melanin
- Arise from red blood marrow & migrate to epidermis, & participate in immune responses?
- Langerhans cells
- Cells thought to function in the sensation of touch?
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Merkel cells (disc.)
-located in deepest layer of epidermis. - The layer of the epidermis that contains stem cells undergoing mitosis is the?
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Stratum basale
-stratum germinativum - Which layer of the epidermis contains ALL the types of cells?
- Stratum basale
- Thorny connective layer superficial to stratum basale?
- Stratum spinosum
- Layer where keratinocytes move upward and die?
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Stratum granulosum
-"graveyard" layer - Layer present ONLY in the thick skin of the fingertips, palms, and sole?
- Stratum lucidum
- The layer of skin you seen when looking at someone, contains dead keratinocytes?
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stratum corneum
-subject to alot of wear & tear. - Process that takes keratinocytes to migrate from basale layer to granulosum layer and die is called?
-
keratinization
-takes about 4 wks. - Composed mainly of connective tissue?
- Dermis
- What are the two regions that make up the dermis?
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1.Papillary region
2.reticular region - Makes up about 1/5 of the thickness of the total dermis layer?
- Papillary region
- Found in the papillary region, fingerlike structures called?
-
dermal papillae
-which contain Meissner corpuscles (corpuscles of touch) - Deepest layer of the dermis; contains, hair follicles, glands and adipose tissue?
- reticular region
- Fingerprints or footprints are also called?
- epidermal ridges
- Produce a pigment that contributes to skin color and absorbs ultraviolet light?
- melanocytes
- A round flat-raised area that represents a benign localized overgrowth of melanocytes & usually devlops in childhood or adolescence?
- Nevus, or mole
- Melanocytes need what enzyme present to activate colorization?
- tyrosinase
- The oxygen-carrying pigment in red blood cells?
- hemoglobin