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Integumentary System
Basic terminology in the Integumentary system
18
Anatomy
Undergraduate 1
02/02/2012

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Term
epidermis
Definition
outer (most superficial) layer of skin;
made of stratified squamous epithelium
Term
dermis
Definition
inner layer of skin;
most of the thickness of skin;
made up of irregular connective tissue;
makes the skin tough and flexible
Term
subcutaneous tissue (hypodermis)
Definition
loose connective tissue that connects skin to inner organs
Term
3 special properties of epidermis
Definition
1. water proof
2. outer layers intended to wear away
3. melanin
Term
follicle (part of hair)
Definition
tube of epidermis that contains the proximal part of hair
Term
root (part of hair)
Definition
lower half of hair that is still alive cells
Term
shaft (part of hair)
Definition
upper half of hair that is dead cells
Term
bulb (part of hair)
Definition
swelling at the base of a hair where cell growth takes place
Term
root sheath (part of hair)
Definition
entire walls of the follicle
Term
hair papilla (part of hair)
Definition
little bump of dermis that pushes into the bulb of hair
Term
arrector pili (part of hair)
Definition
little muscle that extends to and ends at the junction between the dermis and epidermis;
makes hairs stand on end
Term
sebaceous gland
Definition
oil glands (mostly empty into hair follicle); keeps skin soft and flexible and prevents cells from wearing away too fast
Term
Merocrine (eccrine) gland
Definition
sweat gland (produce secretion that is mostly water but some ions and metabolic waste products); cools body through evaporation
Term
root (part of nail)
Definition
base of nail where cells divide and push up
Term
lunula (part of nail)
Definition
light arch at the base of a nail (where cells start to become dead)
Term
body (part of nail)
Definition
externally visible part of nail
Term
bed (part of nail)
Definition
modified layer of skin that nail rests on top of (tightly bound to nail body)
Term
eponychium (part of nail)
Definition
cuticle (fold of skin at base of nail)
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