Skin Flashcards
3 layers of skin and their position beginning with the most superficial
Epidermis
Dermis
Subcutaneous
What are the two types of sweat glands and the difference between them?
Merocrine (acidic secretion) and apocrine (alkaline secretion)
What are Langer’s lines?
Natural lines on skin created by tension
When making incisions, why is it important to cut along the Langer’s lines?
The stitches are less likely to fall out and leave scarring
What is propreiation?
The skin’s ability to know its location in space
In early development, what are the little bumps along the longitudinal axis called?
Somites
What originates from somites?
Nerve supply and muscles in a segmented pattern
What causes the Langer’s lines to no longer be straight?
Limbs extend out and ruin the lines of segmentation
Where do each level of spinal nerves originate from?
Dermatones
What name is given to the disc we originate from?
Tri-laminar disc
What are the three layers of the tri-laminar disc?
Ectoderm
Mesoderm
Endoderm
What originates from the ectoderm?
Skin and nervous tissue
What originates from the mesoderm
Blood, muscles and skeleton
What originates from the endoerm
Gut
How does the tri-laminar disc fold?
Folds into two directions. This creates a cephalo-caudal structure
What does folding create?
Creates spaces/cavities within the membrane
What lines the membranes of the cavities and what does this allow?
Serous liquid and this allows for movement and distension
Where would you find pleural cavities?
The lungs
Where would you find pericardial cavities?
The heart
Where would you find abdomino-pelvic cavities?
The gastro-intestinal and reproductive tracts
Where would you find cranial cavities?
The brain
What happens to the spaces within the body during development?
The space is filled by an organ. The organ pushes the two layers together creating a visceral layer beside the organ and a parietal layer against the wall of the cavity
What are fascial spaces?
Fasicial spaces are casued by the fascia layers separating muscles into compartments
What is adipose tissue composed of?
White and brown fat