integumentary system Flashcards
integument
our skin
functions of skin
covering, waterproof, barrier from foreign invasions, protection, heat control, sensory receptors, vitamin D or hormone production, and excretion
how is skin a sensory receptor
tells us anything that is happening to us outside
-senses the external environment
-different types of receptors
where does sensory information go to?
ascends to the CNS
-through spinal cord to the brainstem and to the brain
-we have to receive then have a perception of what is going on
3 layers of skin
epidermis, dermis, and hypodermis
epidermis
most superficial layer
-contains dead cells
-keratinized cells
dermis
beneath the epidermis
-contains blood vessels, nerves, lymph, smooth muscle, glands, and hair follicles
hypodermis
inner most layer
-fatty tissue (adipose)
-also called subcutaneous
waardenburg
genetic mutation of melanocytes that causes mutation in colors of skin, hair, or eyes
-genetic or congenital
-can cause moderate to profound hearing loss
melanocytes
helps give different colors to the skin
3 types of glands
sebaceous, ceruminous, and sweat
sebaceous glands
along hair follicles and secretes sebum
-controlled by endocrine system
sebum
oil
-lubrication for glossy and pliable skin/shiny hair
ceruminous glands
modified sebaceous glands that produce earwax
-lubrication and protection in ear canal
-helps protect the ear canal
-only in the dermis of external auditory canal
sweat glands
to cool and secrete minimal waste
-most abundant in palms and soles of feet
