chapter 5 part 2
Card Set Information
chapter 5 part 2
Name the four Accessory Structures
What are the characteristics of the Subcutaneous Layer?
located beneath the dermis
supports skin relative to deep tissue
consists of connective tissue and adipocytes
no bounderies between the dermis
The Subcutaneous Layer is a part of the integumentary system
List three characteristics of the dermis
no obvious layers dividing the two layers
contain accessory structures, lymph vessels and nerve fibers
What are the functions of the reticular layer?
prevents damage to surrounding tissue
What are the functions of the papillary layer?
supports and nourishes the epidermis
contain cappillaries and nerves that supply the skins surface
forms projections(dermal papillae) into the epidermis
What type of tissue form dermis?
Where is the papillary located?
directly beneath the basement membrane
List characteristics of Stratum Germinitivum
attached to the basement membrane
contain germinitive cells which are stem cells = dividing or increasing in #
contain melanocytes which color epidermis
new cells slowly migrate to the top
Describe Startum Spinosum
cells from germinitivum continue to divide
contributes to epithelial thickness
Give four characteristics for Stratum Granulosum?
contain displaced cells from the spinosum layer
cells no longer divide
produce a protien called kearatin(durable waterproof)
list three places you can find kearitin
what are the characteristics of Staum Lucidum
found only in thick skin
made from flattened densly packed with kearitin filled cells
Describe The Stratum Corneum
superficial layer of the epidermis
contain 15 to 30 layers of flattened dead epithelial cells
hair consist of _______ filled with _____
that were produced by organs called follices.
what is the structure of hair?
hair follicles are walls made-up of epidermis that extends into the dermis
hair grows from the base of the h.follicle(which lies on the top of the papilla)
hair papilla is an extension of connective tissue w/ cappilaries and nerves
the hair attached to skin is called root
surfacace level is part of the hair shaft
the entire hair shaft is exposed
list hair functions:
protects underlying skin
filters foreign substances in nose,ears,eyes
senses physical contact with skin surface
describe arrector pilli(muscle tissue)
a bundle of smooth muscle
when stimulated, it pulls on the hair follice causing the hair to stand up
stimulus can be fear, or cold temperature
What are the characteristics of the sabaceous glands?(epithelial tissue)
what is sebum?
an oily lipid that lubricates and protect hair and skin