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Anatomy: Fetus in Utero Amniotic sac. A thin-walled sac that surrounds the fetus during pregnancy. The sac is filled with liquid made by the fetus (amniotic fluid) and the membrane that covers the fetal side of the placenta (amnion). This protects the fetus from injury. It also

Anatomy of the Skin Facts about the skin The skin is the body's largest organ. It covers the entire body. It serves as a protective shield against heat, light, injury, and infection. The skin also: Regulates body temperature Stores water and fat Is a sensory organ Prevents water

Anatomy of the Endocrine System in Children These are parts of the endocrine system: Hypothalamus. This gland is in the brain. It secretes hormones that stimulate or suppress the release of hormones in the pituitary gland. It also controls water balance, sleep, temperature

Anatomy of the Endocrine System The endocrine system is a complex network of glands and organs. It uses hormones to control and coordinate your body's metabolism, energy level, reproduction, growth and development, and response to injury, stress, and mood. The following are key

Anatomy of a Newborn Baby's Skull The skull may seem to be one large bone, but it's made of several major bones that are connected together. The major bones that compose the skull include: 2 frontal bones 2 parietal bones 1 occipital bone These bony plates cover the brain, and

Anatomy and Function of the Urinary System How does the urinary system work? The body takes nutrients from food and changes them to energy. After the body has taken the food components that it needs, waste products are left behind in the bowel and in the blood. The kidney and

Neuromuscular Disorders There are many neuromuscular disorders that require clinical care by a doctor or other health care professional. Listed in the directory below are some, for which we have provided a brief overview. Muscular Dystrophy Myasthenia Gravis Spinal Muscular

Topic Index Anatomy of the Breasts Normal Breast Development Breast Health: Three-Step Plan for Preventive Care Common Breast Conditions Breast Cancer About Breast Cancer in Men Routine care is the best way to keep you and your breasts healthy. Click on the links above to learn

Immune Disorders Many different immune disorders require clinical care by a physician or other health care professional. Listed in the directory below are some, for which we have provided a brief overview. All About the Immune System Immune Deficiencies Disorders of the Immune

Anatomy and Function of the Heart Valves What are heart valves? The heart has four chambers: two upper chambers (atria) and two lower chambers (ventricles). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood