1. General Notes on Tissue Healing

2. Skin Healing

5. Dermis - .5 mm to 3 mm thick dermal papillae helps hold epidermis in place (ridges - finger prints) dermis has smooth muscle tissue (pilo erector) bundled with hair follicles “goose bumps” Langers lines - lines formed at right angles to direction of natural stretch caused by gravity & activity (collagen fiber direction) incisions along these lines tend to form less scar tissue substantial plastic surgury implications Hypodermis - Subcutaneous tissue: adipose and areolar tissue density & cellular arrangement of this tissue determines skin “mobility” composed Skin

14. Classification of Muscle Injury Muscle Strain First degree (mild) – “Strained Muscle” minimal structural damage and minimal hemorrhage Second degree (moderate) – “Pulled Muscle” partial tissue tear, significant loss of function, significant hemorrhage Third degree (severe) – “Torn Muscle” complete tear, total loss of function, extensive hemorrhage

16. Classification of Muscle Injury Compartment syndrome: hemorrhage r u pressure in muscle unit u pressure r d blood flow r ischemia r necrosis r gangrene Most often result from severe intramuscular contusions Can be caused by excessive exercise induced muscle damage causes severe pain, palpable tightness, “shiny” skin appearance fascial release (surgery) is done within 12 hrs to minimize damage