| wrinkle | A wrinkle is a fold, ridge or crease in the skin. Skin wrinkles typically appear as a result of aging processes such as glycation or, temporarily, as the result of prolonged (more than a few minutes) immersion in water. Wrinkling in the skin is caused by habitual facial expressions, aging, sun damage, smoking, poor hydration, and various other factors. With prolonged water exposure, the outer layer of skin starts to absorb water. The skin doesn't expand evenly, causing it to wrinkle. Depletion of water in the body, as occurs with dehydration, can also cause this puckering of the skin. Cortisol causes degradation of skin collagen [Wikipedia: http://en.wikipedia.org/wiki/Wrinkle]. | — |
| visual apparatus | The visual apparatus consists of nervous tissues immediately concerned in giving rise to sensations, supported, protected, and nourished by other parts. Its essential parts are, (1) the retina, a thin membrane lying in the eyeball and containing microscopic elements which are so acted upon by light as to stimulate (2) the optic nerve; this nerve ends (3) in a part of the brain (visual centre) which when stimulated arouses in our consciousness a feeling or sensation of sight. The visual centre may be excited in very many ways, and quite independently of the optic nerve or the retina; as is frequently seen in delirious persons, in whom inflammation or congestion of the brain excites directly the visual centre and gives rise to visual hallucinations [Newell Martin, 1895: http://bookdome.com/health/anatomy/Human-Body/The-Human-Visual-Apparatus.html]. | — |
| vermiform appendix | A narrow blind tube usually about three or four inches (7.6 to 10.2 centimeters) long that extends from the cecum in the lower right-hand part of the abdomen, has much lymphoid wall tissue, normally communicates with the cavity of the cecum, and represents an atrophied terminal part of the cecum [Brenda]. | — |
| ventricle | In the heart, a ventricle is one of two large chambers that collect and expel blood received from an atrium towards the peripheral beds within the body and lungs [Wikipedia: http://en.wikipedia.org/wiki/Ventricle_(heart)]. | — |
| venous media | The middle coat of blood vessel walls, composed principally of thin, cylindrical, smooth muscle cells and elastic tissue. It accounts for the bulk of the wall of most arteries. The smooth muscle cells are arranged in circular layers around the vessel, and the thickness of the coat varies with the size of the vessel [[MeSH: http://www.nlm.nih.gov/cgi/mesh/2012/MB_cgi?mode=&term=+L+o+w+e+r+ +l+i+m+b+&field=entry]. | — |
| venous intima | The innermost coat of blood vessels, consisting of a thin lining of endothelial cells longitudinally oriented and continuous with the endothelium of capillaries on the one hand and the endocardium of the heart on the other [Medical Dictionary: http://www.medical-dictionary.cc/what-does/venous-intima-mean]. | — |
| venous adventitia | The adventitia (tunica adventitia) is the outer coat of the vessel, and consists of connective tissue, nerves and vessel capillaries (vasa vasorum). It links the vessels to the surrounding tissues [Gray's Anatomy]. | — |
| urethra | The tube through which urine leaves the body. It empties urine from the bladder [Brenda]. | — |
| ureter | The tube that carries urine from the kidney to the bladder [Brenda]. | — |
| ulna | The ulna is one of the two long bones in the forearm, the other being the radius. It is prismatic in form and runs parallel to the radius, which is shorter and smaller. In anatomical position (i.e. when the arms are down at the sides of the body and the palms of the hands face forward) the ulna is located at the side of the forearm closest to the body (the medial side), the side of the little finger [Wikipedia: http://en.wikipedia.org/wiki/Ulna]. | — |
| tooth | 1: One of the hard bony appendages that are borne on the jaws or in many of the lower vertebrates on other bones in the walls of the mouth or pharynx and serve especially for the prehension and mastication of food and as weapons of offense and defense.n2: Any of various usually hard and sharp processes especially about the mouth of an invertebrate [Brenda]. | — |
| tongue | A fleshy movable process of the floor of the mouths of most vertebrates that bears sensory end organs and small glands and functions especially in taking and swallowing food and in humans as a speech organ [Brenda]. | — |
| thoracic wall | The thoracic wall (or chest wall) is the boundary of the thoracic cavity. The bony portion is known as the thoracic cage. However, the wall also includes muscle, skin, and fascia [Wikipedia: http://en.wikipedia.org/wiki/Thoracic_wall]. | — |
| T cells | T cells or T lymphocytes belong to a group of white blood cells known as lymphocytes, and play a central role in cell-mediated immunity. They can be distinguished from other lymphocytes, such as B cells and natural killer cells (NK cells), by the presence of a T cell receptor (TCR) on the cell surface. They are called T cells because they mature in the thymus, and thus, can also be called thymocytes. There are several subsets of T cells, each with a distinct function [Wikipedia: http://en.wikipedia.org/wiki/T_cell]. | — |
| T cell progenitor | T cells begin their development as a proginotor with the bone marrow but complete their differentiation with the thymus [Awong et al., 2011: http://www.ncbi.nlm.nih.gov/pubmed/21622245]. T cell progenitors are CD34+ peripheral blood mononuclear cells which can be isolated from the blood or the bone marrow [Daniel Wuttke]. | — |
| synovium | The dense connective-tissue membrane that secretes synovial fluid and that lines the ligamentous surfaces of articular capsules, tendon sheaths where free movement is necessary, and bursae [Brenda]. | — |
| sympathetic chain | Either of the pair of ganglionated longitudinal cords of the sympathetic nervous system of which one is situated on each side of the spinal column [Brenda]. | — |
| sweat gland | A simple tubular gland of the skin that secretes perspiration, is widely distributed in nearly all parts of the human skin, and consists typically of an epithelial tube extending spirally from a minute pore on the surface of the skin into the dermis or subcutaneous tissues where it ends in a convoluted tuft [Brenda]. | — |
| spinal cord | The cord of nervous tissue that extends from the brain lengthwise along the back in the vertebral canal, gives off the pairs of spinal nerves, carries impulses to and from the brain, and serves as a center for initiating and coordinating many reflex acts [Brenda]. | — |
| smooth muscle | Muscle tissue that lacks cross striations, that is made up of elongated spindle-shaped cells having a central nucleus, and that is found in vertebrate visceral structures (as the stomach and bladder) as thin sheets performing functions not subject to conscious control by the mind and in all or most of the musculature of invertebrates other than arthropods [Brenda]. | — |
| small intestine | The part of the intestine that lies between the stomach and colon, consists of duodenum, jejunum, and ileum, secretes digestive enzymes, and is the chief site of the absorption of digested nutrients. The proximal portion of the intestine [Brenda]. | — |
| skeletal muscle | A usually voluntary muscle made up of elongated, multinucleated, transversely striated muscle fibers, having principally bony attachments [Brenda]. | — |
| sebaceous gland | Any of various glands in the dermis of the skin that open into a hair follicle and produce and secrete sebum [Brenda]. | — |
| salivary gland | The glands of the oral cavity whose combined secretion constitutes the saliva [Brenda]. | — |
| pharyngeal tonsil | Adenoids (or pharyngeal tonsil, or nasopharyngeal tonsil) are a mass of lymphoid tissue situated posterior to the nasal cavity, in the roof of the nasopharynx, where the nose blends into the throat [Wikipedia: http://en.wikipedia.org/wiki/Pharyngeal_tonsil]. | — |
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