ANAPHY P3😭 Flashcards
Superficial portion/outer part
- Projects above the skin
Shaft
Hair deep to the shaft
- Penetrates dermis, sometimes the
subcutaneous layer
-seen in dermal area
Root
3 CONCENCTRIC LAYERS
A, Inner medulla
B. Middle Cortex
C. Cuticle of the hair
- Lacking in thinner hair
- small amts of pigment granules in gray hair
- lack of pigment granules and presence of air
bubbles in white hair
Inner medulla
major shaft
Middle Cortex
outermost layer
- cuticle cells on the shaft are arranged like
shingles, free edges pointing shingles toward the end of the hair
Cuticle of the hair
Surrounding of the root of the hair
Hair follicle
EXTERNAL: downward continuation of the epidermis
- INTERNAL: produced at the matrix, form cellular tubular
sheath of epithelium b/w external root sheath
Epithelial root sheath
What part of the epithelial root sheath
-???: produced at the matrix, form cellular tubular sheath of epithelium b/w external root sheath
???: downward continuation of the epidermis
INTERNAL
EXTERNAL
base of the hair follicle
bulb
contains connective tissue
and many BV that nourishes the growing hair follicle.
papilla of hair
Germinal layer of cells
- Arise from the stratum basale (site of cell division)
- FUNCTION: Responsible for the growth of existing hairs and
produces new hair when old hairs shed.
Hair matrix
- Smooth muscle that extends from the superficial dermis of the
skin to the dermal root sheath around the side of the hair follicle.
Arrector pili
(dendrites of neurons):
- Generate nerve impulses if hair shafts are moved
Hair root plexus
Under psychological or emotional
stress (cold/fright), autonomic nerve
endings stimulate the arrector pili
muscles to contract, which pulls the
hair shafts perpendicular to the skin
surface
GOOSEBUMPS/GOOSEFLESH”
Simple, branched, acinar (rounded) glands
Opens to the neck follicle
Present at the lips, glans penis, labia
minora, tarsal glands of the eyelids,
Sebaceous glands
Secretes SEBUM
Coats surface of hair and helps them from
drying and becoming brittle.
Prevents excessive evaporation of water
from the skin, making it soft and pliable
Sebaceous hland
Releases sweat, or perspiration
A. ECCRINE SWEAT GLANDS present when?
B. APOCRINE SWEAT GLANDS present when?
Sudoriferous glands
present at birth
develop during puberty only
______________________
: sweat that evaporates
the skin before it is perceived as moisture
_______________________: Sweat that is excreted in larger amts and seen as moisture on the skin
THIS IS PRT OF ECCRINE SWEAT AND
Insensible perspiration
Sensible perspiration
Release sweat in response to emotional stress such as fear or embarrassment (palms, soles and axilla)
EMOTIONAL SWEATING/COLD SWEAT:
Simple, coiled, tubular glands
Axilla, groin, areola of breasts, bearded regions around the face
of adult males.
SECRETORY PORTION: Deep dermis and upper subq layer
EXCRETORY PORTION: Hair follicles
Appears milky and yellowish in color
APOCRINE SWEAT GLANDS
Apocrine sweat interacts with bacteria, bacteria metabolizes the components causing the MUSKY ODOR, thus called BODY
ODOR.
just get it
Modified sweat glands in the external ear
Produces waxy lubricating secretion
SECRETORY PORTION: Subcutaneous layer
EXCRETORY PORTION: Surface of EAM/ducts of sebaceous
Ceruminous Glands
yellowish combination of
ceruminous and sebaceous sweat glands
Provides a sticky barrier to impede the entrance of foreign bodies
and insects
Waterproofs the canals and prevents bacteria and fungi to form
Cerumen/Earwax
