Integumentary System V
Continuing this lengthy review of the integumentary system for massage therapist to aid in the passing of the national exam.
When collagen and elastic fibers in he skin ages it starts to deteriorate. With age the skin starts to loose elasticity, loosens, wrinkles and sags. The specialized network of nerves and nerve endings are found in the dermis layer of the skin. These nerve endings sense pain, touch, pressure, temperature from the surrounding environment. These nerve endings are found in various levels in the dermis from muscle fibers, hair follicles, to sweat glands and sebaceous glands and finally blood vessels.
Hair follicles in a newborn baby are extremely fine and soft are called lanugo. In the human body the palms of the hands, sales of the feet and lips of the month are devoid of hair follicles and are truly hairless. Hair follicles in the public region are caused by hormones. The tube of the hair follicle is where growth originates. The small cap-shaped cluster of cells where the hair begins to grow is called the hair papilla. The root the hair is that part which is hidden in the hair follicle. The visible part of the hair is called the shaft. Myth cutting and shaving the hair will make it grow faster.
The tiny, smooth and involuntary muscles that cause goose bumps on the surface of the skin are called arrector pili, they also can make the hair stand straight up on the surface of the skin. The receptors in the skin allow the skin to serve as a sense organ of the body.
Deep to the skin surface the pacinan corpuscles help in the detection of pressure. Where on the other hand the meissner’s corpusles lye close the skins surface and help detect light touch. The free never endings in the skin help detect pain and temperature of the skin. Krause’s end bulbs in the skin detect low-frequency vibration.
