In the anatomical position the palms face —— with thumbs pointing ——– to the body
anteriorly ; lateral
what is the integumentary system in one word?
skin
how much percentage of body weight does our skin take up ?
7% of body weight
where is the thinnest of skin located ?
on the eyelid
where is the thickest of skin located ?
on palms of hand & soles of feet
what are the 6 key skin functions ?
- Barrier to external environment
- protects tissue
- thermoregulation
- excretion via sweating
- cutaneous receptors( pain & pressure)
- makes vit D
what are 3 key things about the epidermis ?
- thinnest part of integument
- Dead and living cell
- karatinized (dead kartinocytes) at the top
what is being keratinized
a form of apoptosis where dead cell have a influx of keratim
what are the 4 layers of the epidermis from Superficial to Deep?
- Stratum Corneum
- Stratum Granulosum
- Stratum Spinosum
- Stratum Basale
what 3 types of cells/cytes does the stratum basale have?
- Keratinocytes
- Melanocytes
- Merkel cells
what does the merkel cells do
be apart of blood
what does the keratinocytes do ?
they show the pigmentation of melanocytes
what does the stratum basale do ?
moves keratinocytes towards the stratum corneum
what are the 6 components that are found in the dermis?
- Connective Tissue
- Blood Vessels
- Glands
- Nerve cells
- Smooth muscles
what are the two parts of the dermis?
Papillary & Reticular
what is the function of the papillary in the dermis ?
it is the superficial part and it interdigitate with the epidermis through the basement membrane
what is the function of the reticular ?
it is a deep part of the dermis that contains dense connective tissue
what are the 2 parts of the the integument(skin) but what is not
the epidermis superficial and the dermis deep is the 2 that make up the skin system but the subcutaneous is not part of it
what are 3 key things about the subcutaneous
1.has connective tissue containing fat (adipose tissue) for energy and areolar (loose) tissue
2. Protection for body
3. Vascular Network
what are the 3 specially modified epidermal ?
Nails , Hair & Exocrine
what is the modification of the nail bed and the 3 components of the nail plate and what is the active part
the modification of stratum corneum
nail plate:
free edge
nail body
nail root
and and active part matrix
what is the most distal part of the nail
the free edge
what is the most proximal part of the nail?
the matrix
why is the nail bed pink ?
due to various blood vessels under
