Skin Flashcards
Structures functions types of skin and their structures and location
Two types of skin
Thick skin [soles of ur feet]
thin skin [eyelids]
5 Functions of your skin?
Protective Metabolic Disease indicator Sensory Thermoregulatory
Components of integumentary system
Skin
Glands
Hair
Nails
Layers of skin?
Epidermis
Dermis
Subcutaneous layer
Dermis is differentiated into??
Papillary that has fine fibers
And reticular layer that has compact n thick fibers
what type of tissue is the Epidermis?
Stratified squamous epithelium
4 cell types of epidermis?
Keratinocytes
Langerhans cell
Mwlanocytes
Merkel cells
Layers in thin skin type
Stratum: corneum Granulosum Spinosum Basale
Layers in thick skin type
Stratum: Corneum Granulosum Spinosum Basale Lucida
Explain Keratinocytes?
It produces the fibrous protein called keratin
Waterproofing the skin
Forms the layer called stratum basale
They push their way up to the surface where they become dead cells(with keratin)
Explain Melanocytes
Produces the black pigment called melanin
-Stratum basale
They accumulates on the superfacial aspects of keratinocytes shielding its nucleus from Uv light
What do u know about Merkel cell?
All about touch
Epidermis of hairless skin
They attach to keratinocytes by desmosomes
Make contact with sensory neuron ending(merkel disc)
What do u know about langerhans
They are star shaped
Arise from bone marrow that migrate to epidermis m
Easily damaged by UV light
Epidermal dendritic cells
Stratum corneum
Aka 'Horny' layer Rows of dead cells Filled with keratin Continuously shred n replaced Barrier against light,heat &bacteria
Stratum granulosum
Nuclei is flattened
Darkly stained-keratohyaline granules
It has lamellated granules-They secret glycolipids into extracellular spaces
To slow water loss in the Epidermis
Stratum spinosum
Many sided cells
Known as Prickly spines
They shrink when prepared for slide
Melanin granules langerhan cells predominate
Stratum basale
Deepest layer
Single row of cells
Attached to dermis
Contain merkel and melanocytes
Subcutaneous layer?
Also known as Hypodermis
Found underneath the dermis
Contains adipose n sweat glands
Responsible for metabolic functions
Thick skin
5 layers Thinner dermis No hairs Many eccrine/merocrine sweat glands More cells enter stratum corneum
Thin
4 layers Hairs Thick dermis In the body Fewer eccrine/merocrine sweat glands Fewer cells enter stratum corneum
Skin colour depends on which 3 things?
Carotene pigments
Amount of blood and oxygen
Amount of melanin
Sebum
The oily substance which is secreted by sebaceous glands
Difference between eecrine and apocrine?
A
Eecrine is found throughout your life and throughout the body
Apocrine at puberty and is found in genital areas and armpits
B.
eecrine glands open directly into the skins epidermis
The lumen is small
Apocrine release their swear at the root of the hair follicle and lumen is big
Similarity between eecrine and Apocrine
Both have myoepithelial cells which contracts and squeeze and discharge secretions
The skin function
Develops from epidermis and invades the dermis & Hypodermis
Thermoregulation
Protection
Function of Arrector pilli muscle
It is a smooth muscle
It Makes the hair stand up when you are cold,frightened etc
Meissner corpuscles receptors ?
Also known as Tactile
They sense light touch
Hairless portion of the skin
They are known as elliptical
Pacician corpuscles?
Also known as lamellated
They sense heavy pressure
Found deep in reticular dermis near subcutaneous tissue n joint ligaments
They have oval structures
