A glossary of anatomical terms
Bobby Palange, age 3, who was accidentally run over by his father's car in their driveway one year ago. (Newsday / Ken Sawchuk / February 20, 2006)
Atrium: either of the heart's two upper chambers, which receive blood from the body (right) or lungs (left) before passing it to the heart's right or left ventricle, respectively.
Brainstem: an elongated, stalk-shaped region of the brain that connects the spinal cord to the upper brain and governs functions such as breathing, heart rate, digestion and pupil constriction.
Cartilage: a type of tough connective tissue that lines joints, seeds the development of bone, and forms the flexible portions of structures such as the nose and ears.
Cerebrospinal fluid: a clear, water-like fluid that bathes, protects and nourishes the brain and spinal cord and flows within the brain's four main cavities, or ventricles.
Collagen: a protein fiber that dominates the connective tissue in skin, tendons, ligaments, cartilage and bone, providing strength, elasticity and support.
Craniosynostosis: a condition in which one or more sutures between the skull bones close prematurely and leave the head misshapen as the skull accommodates the growing brain.
Cranium: the helmet-like portion of the skull that surrounds the brain.
Descending aorta: The section of the body's largest artery that runs through the chest and abdomen before branching off into two main arteries that travel down the legs.
Dura: also known as the dura mater; the leathery and outermost of three membranes that cover the brain.
Edinger-Westphal nucleus: a site in the brainstem where nerve cells join forces to become an oculomotor nerve component governing constriction of the pupil.
Epidural hematoma: an accumulation of blood between the skull and the dura membrane, often the result of a traumatic injury.
Fascia: a band of fibrous tissue that covers muscles and some organs, offering both protection and structure.
Foramen magnum: a large opening in the base of the skull through which the brainstem's medulla oblongata extends to connect with the spinal cord.
Hemophilia: an inherited genetic disorder marked by the deficiency of a blood-clotting protein and an elevated risk of severe bleeding.
Herniation: the abnormal expansion of an organ or tissue out of its own space or cavity.
Intracranial pressure: the pressure within the cranial part of the skull, which may rise due to swelling of the brain within its confined space.
Neuron: a specialized cell within the brain and central nervous system that transmits messages in the form of electrical signals.
Neurotransmitter: a chemical courier that relays electrical messages across the tiny gaps between neurons.
Oculomotor nerve: a major nerve that arises in the midbrain and governs nearly all eye movements.
Optic nerve: the nerve attached to each eye that transmits visual information from the retina to the brain.
Pleural cavity: the tissue-lined cavity between the lungs and the chest wall.
Ramus: refers to one of several branches of the pelvic girdle that connect the pubis to the ischium and ilium bones.
Sphenoid bone: a butterfly-shaped skull bone between the frontal and temporal bones that forms part of the base and back of the eye sockets.
Subclavian vein: either of two major veins that direct blood from the right and left arm into the superior vena cava on its way toward the heart.
Superior sagittal sinus: a major blood channel that runs between the brain's left and right hemispheres, where it collects and drains blood from a variety of smaller vessels.
Superior vena cava: a major vein that directs blood from the head and arms back to the heart via the right atrium.
Sutures: flexible joints between the bones of a newborn's skull that allow for skull expansion before they harden and fuse in later years. Also, the stitches used to close a wound or an incision after surgery.
Temporal bone: a bone on each side of the skull that houses the inner ear.
Trachea: the windpipe, or passageway for air that leads from the larynx to the lungs.
Ventricle: one of four main cavities in the brain, each filled with cerebrospinal fluid. Also, either of the heart's two lower chambers.
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