surgery

The word "surgery" can also refer to the place where surgery is performed, or simply the office of a physician, dentist, or veterinarian. Surgeons must also manage pre-operative, post-operative, and surgical complications that might arise. Surgical procedures are generally categorized by urgency, type of procedure, body system involved, degree of invasiveness, and special instrumentation. In other words, surgery is a technology consisting of a physical intervention on tissues. As a general rule, a procedure is considered surgical when it involves cutting of a patient's tissues or closure of a previously sustained wound. Other procedures that do not necessarily fall under this rubric are considered noninvasive (for example, suturing an incision), or minimally invasive (for example, laparoscopic surgery). Some of the most common operations performed today include: Appendectomy – removal of the appendix. This is normally performed as an emergency procedure although elective surgery may occasionally be carried out for people with recurrent acute inflammation (appendicitis) which has not responded to other treatment

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hair

Hair is a protein filament that grows from follicles found in the dermis. Hair is one of the defining characteristics of mammals. The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair. Most common interest in hair is focused on hair growth, hair types, and hair care, but hair is also an important biomaterial primarily composed of protein, notably alpha-keratin. Attitudes towards different hair, such as hairstyles and hair cut names, vary greatly around the world. Hair may be colored, trimmed, shaved, plucked, or otherwise removed with treatments such as waxing, sugaring and threading. The ancient Egyptians styled their hair using a fat-based cream called moroccan oil. Ancient Romans also used olive oil to soften their hair and made wigs from human and animal hair (like sheeps wool). In China people used herbal oils to nourish their scalp and improve the health of their hair: argan oil
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lip

The upper and lower lip s are referred to as the "Labium superius oris" and "Labium inferius oris", respectively. The juncture where the lips meet the surrounding skin of the mouth area is the vermilion border, and the typically reddish area within the borders is called the vermilion zone. The vermilion border of the upper lip is known as the cupid's bow. The fleshy protuberance located in the center of the lip is a tubercle known by various terms including the procheilon (also spelled prochilon), the "tuberculum labii superioris", and the "labial tubercle". The vertical groove extending from the procheilon to the nasal septum is called the philtrum. The skin of the lip, with three to five cellular layers, is very thin compared to typical face skin, which has up to 16 layers. With light skin color, the lip skin contains fewer melanocytes (cells which produce melanin pigment). Because of this, the blood vessels appear through the skin of the
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