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"Bacteria do not cause disease they are merely the agent of disease. It is lowered immunity that allows bacteria to proliferate."

Anthony Mossop

About The Human Head

Hair is present on all skin surfaces except the palms, soles, lips, nipples, and various parts of the external reproductive organs however, it is not always well developed. For example, it is very fine on the forehead and the inside surface of the arm. Each hair develops from a group of epidermal cells at the base of a tube-like depression called a "hair follicle." This follicle extends from the surface into the dermis and may pass into the subcutaneous layer. The cells at its base receive nourishment from dermal blood vessels that occur in a projection of connective tissue, called the derma papilla, at the base of the follicle. As these epidermal cells divide and grow, older cells are pushed toward the surface. The cells that move upward and away from the nutrient supply then die. Their remains constitute the shaft of a developing hair. In other words, a hair is composed of dead epidermal cells. A bundle of smooth muscle cells, forming the "arrector pili muscle," is attached to each hair follicle. This muscle is positioned so that the hair within the follicle stands on end when the muscle contracts. If a person is emotionally upset or very cold, nerve impulses may stimulate the arrector pili muscles to contract, causing gooseflesh or "goose bumps." Each hair follicle also has one or more sebaceous glands


Skull

The skull is the bony section of the head. The skull encases and protects the brain, houses the brain senses, provides attachments for muscles of the head and neck, and helps to form the first portions of the respiratory and digestive tracts. The skull rests on the first vertebra, which is called the "Atlas". At birth, the skull is large in comparison to the rest of the body, and a baby's skull is compressible. The "soft spots" in a baby's head harden and grow together until the bones meet and mesh like a jigsaw puzzle. The largest of the six main soft spots is a diamond-shaped area near the middle of the top of the skull. This is the last area to harden and close, usually at about the age of eighteen months. "Skullduggery" is some kind of trick or some unscrupulous behavior.

The information on this website is provided for information purposes only and is not intended or recommended as a substitute for professional medical advice. Always seek the advice of your doctor/physician or other qualified health care provider regarding any medical condition or treatment. Some or all of the information on this page may be supplied by a third-party and not controlled by the DianaMossop.com website or authors and is therefore is not the responsibility of the DianaMossop.com website or its authors.

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