Module 5-6 Flashcards
Where is the epidermis layer found and what does it consist of?
It is the outermost layer and consists of stratified squamous epithelial tissue and contains no blood vessels
Where is the dermis later found and composed of?
Inner, deeper layer that is composed of connective tissue, primarily collagen fibers but also contains elastin and reticular fibers. Abundance of blood vessels, sweat glands, sebaceous glands and nerve endings
Where is the subcutaneous layer found and composed of?
Also known as the hypodermis it is beneath the skin and composed of subcutaneous tissue. Made of loose connective(areolar) and adipose tissue. Bunds the skin to the underlying tissue
What is the role of the stratum basale layer and where is it found?
It is the innermost layer of the epidermis, it produces new skin cells as stem cells undergo mitosis
Why do cells stop dividing and produce keratin?
When new skin cells push the older skin cells upward
What is the stratum Corneille composed of and what’s its function?
It consists of 30 layers of dead, flat Charitan coated cells. It’s function is making the skin durable and resistant to absorption. Effective barrier preventing water from entering the body from the outside
What is the arrector pili muscle?
Cold, stress, fear and emotions cause the muscle to contract which causes the hairs to stand on end (goosebumps)
What are nails composed of?
Densely packed heavily keratinized epithelial cells
Eccrine glands
Contain a duct that leads from the secretory portion to the skins surface - found in palms, Four head, souls and upper torso. They produce sweat, aluminate waste and maintain the body temperature.
Apocrine glands
Contain a duck that leads to a hair follicle; these are sent to clients that respond to stress and sexual stimulation. Only has a strong order when it accumulates on the skin because bacteria to grade substances in sweat resulting in body odor. Begins to function during puberty and is located in auxiliary and growing regions
Sebaceous glands
Open into the hair follicle; they secrete an oily substance called sebum. Sebum keeps the skin and nails from drying out.Pimples and blackheads can result from accumulation of excess sebum in gland ducts
third-degree burn
Extends into the subcutaneous layer. May not be painful initially. May appear white or black and leathery. Often requires skin grafts.
second-degree burn
Involves the epidermis and part of the dermis. Result in blisters, severe pain, and swelling. May result in scarring. May appear red, white or tan.
first-degree burn
Involves only the epidermis. Causes redness, slight swelling and pain. Often results from sunlight.
What is the role of oligodenerocytes
Form the myelin sheath in the brain and spinal cord; speed signal conduction
Ependymal cell
Line spinal cord and cavities of the brain; Suncoast secretes cerebrospinal fluid, others have cilia that aid fluid circulation
What is the role of microglia?
Perform phagocytosis and engulfing micro organisms and cellular debris
Astrocytes
Extend through brain tissue;Nourishing neurons; help form-blood brain barrier; attach neurons to blood vessels, provide structural support.
Schwann cells
For Mylan sheath around nerves and PNS, form neurilemma
What is the blood bBrain barrier composed of and what is its role?
It is composed of astrocytes joining endothelial cells lining walls of the pillories. It allows small molecules to diffuse across the brain but blocks larger molecules.
Sensory (afferent) Neurons
Carries impulses towards CNS
Interneurons
In the CNS, connects sensory pathways without going motor pathways
Motor (efferent) Neurons
Relay messages from the brain
What is the role of a neurilemma
Regenerate injured nervous
