An MRI scan of the head. Head and neck anatomy focuses on the structures of the head and neck of the human body, including the brain, bones, muscles, blood vessels, nerves, glands, nose, mouth, teeth, tongue, and throat. It is an area frequently studied in depth by surgeons, dentists, dental technicians, and speech language pathologists. Musculoskeletal system[edit] Head and neck anatomy Head and neck anatomy
Body proportions Body proportions While there is significant variation in anatomical proportions between people, there are many references to body proportions that are intended to be canonical, either in art, measurement, or medicine. Similarly, in art, body proportions are the study of relation of human or animal body parts to each other and to the whole. These ratios are used in veristic depictions of the figure, and also become part of an aesthetic canon within a culture.
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Neutral spine Posture and natural curvatures[edit] The word posture comes from the Latin verb ponere, which means "to put or place." The general concept of human posture refers to "the carriage of the body as a whole, the attitude of the body, or the position of the limbs (the arms and legs)." [4] Webster's New World Medical Dictionary defines neutral posture as the stance that is attained "when the joints are not bent and the spine is aligned and not twisted.[5] Neutral posture has given rise to the idea of achieving “ideal posture.” Ideal posture indicates proper alignment of the body’s segments such that the least amount of energy is required to maintain a desired position. The benefit of achieving this ideal position would be that the least amount of stress is placed on the body’s tissues.[6] In this position, a person is able to completely and optimally attain balance and proportion of his or her body mass and framework, based on his or her physical limitations. Neutral spine
The sole is the bottom of the foot. In humans the sole of the foot is anatomically referred to as the plantar aspect. The equivalent surface in ungulates is the hoof. Deep anatomy of the sole The skin on the sole of the foot lacks the vellus hair and pigmentation found on the rest of the body, and has a high concentration of sweat pores. Sole (foot) Sole (foot)
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Historical Anatomies on the Web Historical Anatomies Home > Browse Titles Images have been selected from the following anatomical atlases in the National Library of Medicine's collection. Each atlas is linked to a brief Author & Title Description, which offers an historical discussion of the work, its author, the artists, and the illustration technique. Historical Anatomies on the Web
Your Guide to the Human Body and Human Body Systems Kids' Biology: The Human Body: Articles, facts, photos Kids' Health: How the Body Works: Facts , Movies, Articles BBC: The Human Body: An EXCELLENT resource on each system of the human body, including INTERACTIVE activities Get Body Smart: Visually learn about the human body using Interactive"Flash" Animations Your Guide to the Human Body and Human Body Systems
The stomach is located between the esophagus and the small intestine. It secretes protein-digesting enzymes called proteases and strong acids to aid in food digestion, (sent to it via esophageal peristalsis) through smooth muscular contortions (called segmentation) before sending partially digested food (chyme) to the small intestines. Structure[edit] Stomach Stomach
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Human leg Human leg Legs are used for standing, walking, jumping, running, kicking, and similar activities, and constitute a significant portion of a person's mass. Structure[edit] In human anatomical terms, the leg is the part of the lower extremity that lies between the knee and the ankle,[6] the thigh is between the hip and knee and the term "lower extremity" is used to describe the colloquial leg. This article generally follows the common usage. Comparison between human and gorilla skeletons. (Gorilla in non-natural stretched posture.)
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Google's Body Browser is a Google Earth for Human Physiology Google has mapped just about every traffic artery you could ever want to locate on Google Maps, but what if the thruway you're looking for isn't on any road atlas? To help you tell your axillary artery from your common carotid, Google has created a G-Maps-like search-able guide for the human body that lets you zoom, scroll, and search for every muscle, gland, nerve, bone, or organ in our common physiology. As far as handy Web apps go, Body Browser is pretty neat; a sliding scroll bar allows you to peel away layers of the body, starting at the skin and moving down through the muscles and bone/organs to the cardiovascular and nervous systems. It allows you to zoom in tight (with nice resolution) to get the name of a specific bodily bit. Clicking on anything produces a handy label that identifies what you're looking at. Then there's the search function of course, which allows you to locate any part of the body by just typing in the name. Google's Body Browser is a Google Earth for Human Physiology
Human physical appearance The human body Factors affecting physical appearance[edit] Various factors are considered relevant in relation to the physical appearance of humans. Physiological differences[edit] Humans are distributed across the globe with exception of Antarctica, and form a very variable species. In adults, average weight varies from around 40 kilos for the smallest and most lightly built tropical people to around 80 kilos for the heavier northern peoples.[1][2] Size also varies between the sexes, the sexual dimorphism in humans being more pronounced that that of chimpanzees, but less that the dimorphism found in gorillas.[3] The colouration of skin, hair and eyes also varies considerably, with darker pigmentation domination in tropical climates and lighter in polar regions. Human physical appearance
Eye color In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in the iris pigment epithelium (located on the back of the iris), the melanin content within the iris stroma (located at the front of the iris), and the cellular density of the stroma.[4] The appearance of blue and green, as well as hazel eyes, results from the Rayleigh scattering of light in the stroma, a phenomenon similar to that which accounts for the blueness of the sky. Neither blue nor green pigments are ever present in the human iris or ocular fluid.[3][5] Eye color is thus an instance of structural color and varies depending on the lighting conditions, especially for lighter-colored eyes. Genetic determination Eye color is an inherited trait influenced by more than one gene.[12][13] These genes are sought using associations to small changes in the genes themselves and in neighboring genes. These changes are known as single-nucleotide polymorphisms or SNPs.
The human eye is an organ that reacts to light and has several purposes. As a conscious sense organ, the mammalian eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. Human eye
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Skeletal muscle is a form of striated muscle tissue which is under the control of the somatic nervous system; that is to say, it is voluntarily controlled. It is one of three major muscle types, the others being cardiac and smooth muscle. As their name suggests, most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. The myofibers are in turn composed of myofibrils. The myofibrils are composed of actin and myosin filaments repeated in units called a sarcomere, the basic functional unit of the muscle fiber. The sarcomere is responsible for skeletal muscle's striated appearance and forms the basic machinery necessary for muscle contraction. Skeletal muscle
Discovery Health "How Your Heart Works" Ever­yone knows that the heart is a vital organ. We cannot live without our heart. However, when you get right down to it, the heart is just a pump. A complex and important one, yes, but still just a pump. As with all other pumps it can become clogged, break down and need repair.
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