2. Facial Anatomy, Physiology, and Disease Flashcards
A mass of blood released from a broken blood vessel and trapped in an organ or body tissue
hematoma
Brown-black pigment that gives color to the skin and hair
melanin
Cell that produces melanin
melanocyte
Small, cone-shaped projection
papilla (plural: papillae)
Cell that continually produces new cells
stem cell
The largest organ in the body
skin
The two layers of the skin
dermis (inner layer) and epidermis (outer layer)
Five layers of the epidermis
- stratum germinativum — basal layer (deepest)
- stratum spinosum — spiny layer
- stratum granulosum — granular layer
- stratum lucidum — clear layer (palms and soles)
- stratum corneum — horny layer (outermost layer)
Layer of skin responsible for the growth of the epidermis
stratum germinativum or “basal layer”
Layer of skin that contains melanocytes
stratum germinativum or “basal layer”
Cell division and growth occur in this layer of skin
stratum spinosum or “living layer”
Together, the stratum germinativum and stratum spinosum are sometimes called ______.
The Malpighian layer or “living layer”
The arms of melanocytes extend into this layer, releasing melanin into it
stratum spinosum
The middle layer of the epidermis. The cells are layer are dying and become flattened.
stratum granulosum or “granular layer”
A layer of transparent cells found in areas of thick skin
stratum lucidum or “clear layer”
The outermost/top layer of skin made of dead, scale-like cells that are continually shed and replaced by new cells from underneath.
stratum corneum or “horny layer”
The life cycle of a skin cell, from stratum germinativum to stratum corneum
1-3 weeks
The _____ lies beneath the epidermis
dermis
The dermis is composed of _____ and has _____ layers.
connective tissue; two
The top layer of the dermis
papillary layer
The _____ contains papillae, which contain either looped capillaries (small blood vessels) or nerve fibers that detect touch, heat, or cold.
papillary layer
The lowest layer of the dermis
reticular layer
The _____ contains arrector pili muscles, blood vessels, fat cells, hair follicles, lymph vessels, oil glands, and sweat glands.
reticular layer
_____ and _____ are supplied to the skin by the blood and lymph found in the reticular layer.
oxygen; nutrients
Fatty tissue found in the reticular layer of skin is sometimes referred to as a separate layer callled _____
subcutaneous layer or subcutaneous tissue
Needles inserted in the subcutaneous layer (due to improper needle length) can sometimes result in _____.
hematomas or bruising
This is because of the blood vessels located in the subcutaneous layer.
In order to be permanent, pigment must be placed in the _____ layer.
upper reticular
If pigment is placed too high in the layers of the skin, it will not be permanent. If it is placed too deep, it may be _____ or _____.
unsafe; appear blurry.
The layer of connective tissue beneath the dermis that connects the skin to the structures beneath it
hypodermis
The six functions of the skin
- Protection (against microorganisms, chemicals, etc.)
- Absorption (sunlight to Vitamin D)
- Regulation (maintaining body temperature)
- Sensation (heat, cold, touch)
- Excretion (some waste elimination)
- Secretion (oil protects against TEWL)
A strong, fibrous protein found in connective tissue
collagen
A protein present in plasma
fibrinogen
A thread-shaped protein formed by fibrinogen in response to injury; essential to blood clotting
fibrin
The body’s response to injury; an immune response
inflammation
A clear fluid formed in the body’s tissue spaces that carries lymphocytes
lymph
A cell present in blood and lymphatic tissue that fights infection
lymphocyte