Integument Flashcards
Integument
Skin; derivided and accessory organs
3 layers of skin
Epidermis, dermis, hypodermics
Epidermis
keratinized stratified squamous epithelium
5 layers of the epidermis
(Deepest to most superficial)
Stratum basale
Stratum spinosum
Stratum granulosum
Stratum lucidum
Stratum corneum
Keratinization
Continuous process of migration of cells from stratum basale to the stratum corneum; ultimately being sloughed
How many layers does furry skin have?
3 (basale,spinosum and corneum)
Dermis
Connective tissue; structural strength of skin
2 layers of dermis
Papillary and reticular
Papillary
Just below basement; sm region; areolar CT
Reticular
80% of the dermis; dense irregular CT
Dermal papilla
Cements the epidermis and the dermis
Hypodermis
Areolar CT w/ a lot of adipocytes
SQ
Subcutaneous
Hair
Accessory structure of the Integument
Shaft
Visible portion of the hair
Root
No visible part of the hair
3 layers of hair
Medulla(inner), cortex, cuticle(outer)
Invagination
A vaginal like structure (pocket)
Arrector Pili muscle
Smooth muscle in dermis attached to follicle involuntary
Glands
Exocrine, endocrine,sebaceous, sweat, tail and anal
Exocrine glands
Discharge secretions through ducts into local area
Endocrine glands
Discharge secretions into blood- travel to distant areas
Sebaceous glands
Secretes sebum into center of alveolus
Holocrine
Mechanism for how secretion happens
Sweat glands
Found everywhere on animals
Apocrine
Sweat empties into follicle
Eccrine
Discharge sweat to surface of skin
Tail glands
Sebaceous glands at the base of tail “stud tail”
Anal glands
2 glands in the anus; scents the poop
Plenum Nasale
Top of nose
Polygonal plates
Deep grooves in epidermis form plates (noses)
Paw pads
Have 5 layers of epidermis; thick stratum corneum; thick hypodermis of adipose tissue insulation
Feline toe anatomy
3 phalanges( proximal, middle and distal)
Dewclaw only has proximal and distal
Wall corium
“Quick” corium is attached to ungual process of distal phalanx
