ANA300Y1 Chapter Notes -Carpal Tunnel, Middle Ear, Cleft Lip And Cleft Palate
Document Summary
Extreme stretching of the skin (occurs during pregnancy or sudden weight increases) can tear the dermis. Silvery white scars called stiae (stretch marks) indicate dermal tearing. A blister is formed by the separation of the epidermal and dermal layers by a fluid filled pocket. Often excessive sun exposure can cause eventual damages to skin, and damage the melanin barrier. It can cause clumping of elastin fibers leading to leathery skin, causing temporary immuno-suppression and lead to skin cancer. The pinkish hue of fair skin reflects the color of oxygenated hemoglobin in the red blood cells circulating through the dermal capillaries. If the hemoglobin is poorly oxygenated, both the blood and the skin of light-skinned people appear blue (cyanosis). In dark-skinned individuals this condition does not appear because of the masking of hemoglobin. Can indicate problems with the respiratory system (circulatory system). If a sebaceous (oil) gland becomes blocked by accumulated sebum (oily secretion) causing the appearance of a whitehead.
