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Atrioventricular Node definition: A small nodular mass of specialized muscle fibers located in the interatrial septum near the opening of the coronary sinus. It gives rise to the atrioventricular bundle of the conduction system of the heart.
atrioventricular node definition: small nodular mass of specialized muscle fibers located in the interatrial septum near the opening of the coronary sinus.
Atrioventricular node definition: Subdivision of conducting system of heart which is located in the muscular part of the interatrial septum that is continuous with the atrioventricular bundle.
Lymph Nodes definition: They are oval or bean shaped bodies (1 - 30 mm in diameter) located along the lymphatic system.
lymph node definition: any of the accumulations of lymphoid tissue organized as definite lymphoid organs, varying from 1 to 25 mm in diameter situated along the course of lymphatic vessels and consisting of an outer cortical and an inner medullary part; the main source of lymphocytes of the peripheral blood and, as part of the reticuloendothelial system, serves as a defense mechanism by removing noxious agents, such as bacteria and toxins.
lymph node definition: (limf node) A rounded mass of lymphatic tissue that is surrounded by a capsule of connective tissue. Lymph nodes filter lymph (lymphatic fluid), and they store lymphocytes (white blood cells). They are located along lymphatic vessels.
LYMPH NODE definition: A bean-shaped organ surrounded by a connective tissue capsule. It is part of the lymphatic system and is found through out the body. It is composed predominantly of lymphocytes and its main function is immune protection. (NCI)
Lymph Node definition: A bean-shaped organ surrounded by a connective tissue capsule. It is part of the lymphatic system and is found through out the body. It is composed predominantly of lymphocytes and its main function is immune protection.
Ranvier's Nodes definition: Regularly spaced gaps in the myelin sheaths of peripheral axons. Ranvier's nodes allow saltatory conduction, that is, jumping of impulses from node to node, which is faster and more energetically favorable than continuous conduction.
node of Ranvier definition: constrictions occurring on myelinated nerve fibers at regular intervals of about one millimeter; at these sites the myelin sheath is absent and the axon is enclosed only by Schwann cell processes; Ranvier's nodes allow saltatory conduction, that is, jumping of impulses from node to node, which is faster and more energetically favorable than continuous conduction.
node of Ranvier definition: An axon part that is a gap in the myelin where voltage-gated sodium channels cluster and saltatory conduction is executed. [GOC:mh]
Sinoatrial Node definition: The small mass of modified cardiac muscle fibers located at the junction of the superior vena cava (VENA CAVA, SUPERIOR) and right atrium. Contraction impulses probably start in this node, spread over the atrium (HEART ATRIUM) and are then transmitted by the atrioventricular bundle (BUNDLE OF HIS) to the ventricle (HEART VENTRICLE).
Sinuatrial node definition: Subdivision of conducting system of heart at the junction of the right atrium and the superior vena cava, around the sinoatrial nodal branch of right coronary artery and is continuous with the internodal tract.
Submandibular Lymph Node definition: A lymph node located beneath the floor of the oral cavity.
supraclavicular lymph nodes definition: Lymph nodes located above the clavicle (collarbone).
SUPRACLAVICULAR LYMPH NODE definition: A lymph node which is located above the clavicle. (NCI)
Supraclavicular Lymph Node definition: A lymph node which is located above the clavicle.
Retropharyngeal Lymph Node definition: A lymph node located in the retropharyngeal space behind the upper part of the pharynx.
Infraclavicular Lymph Node definition: A lymph node located in the area below the clavicle.
INFRACLAVICULAR LYMPH NODE definition: A lymph node located in the area below the clavicle. (NCI)
Tracheobronchial Lymph Node definition: A lymph node located near the bifurcation of the trachea.
Internal Mammary Lymph Node definition: Any of the lymph nodes of the breast located under the ribcage, near the sternum.
Intercostal Lymph Node definition: A lymph node located in the intercostal space of the thoracic wall.
Celiac Lymph Node definition: A lymph node at the base of the celiac artery.
CELIAC LYMPH NODE definition: A lymph node at the base of the celiac artery. (NCI)
Portal Lymph Node definition: Lymph nodes surrounding the portal vein.
Hepatic Lymph Node definition: Any of the lymph nodes adjacent to the stomach and duodenum.
Pancreatic Lymph Node definition: A lymph node of the pancreas.
Sacral Lymph Node definition: A lymph node located in the sacral region.
Popliteal Lymph Node definition: Lymph node located within the fat layer of the knee joint.
Intra-Abdominal Lymph Node definition: Any lymph node within the abdomen.
Bronchial Lymph Node definition: Lymph node located in the bronchi.