node

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node

 [nōd]
a small mass of tissue in the form of a swelling, knot, or protuberance, either normal or pathological. adj., adj no´dal.
node of Aschoff and Tawara atrioventricular node.
atrioventricular node (AV node) a collection of cardiac fibers at the base of the interatrial septum that transmits the cardiac impulse initiated by the sinoatrial node.
Bouchard's n's cartilaginous and bony enlargements of the proximal interphalangeal joints of the fingers in degenerative joint disease; such nodes on the distal joints are called Heberden's nodes.
Delphian node a lymph node encased in the fascia in the midline just above the thyroid isthmus, so called because it is exposed first at operation and, if diseased, is indicative of disease of the thyroid gland.
Flack's node sinoatrial node.
Heberden's n's nodular protrusions on the phalanges at the distal interphalangeal joints of the fingers in osteoarthritis. Similar nodes on the proximal joints are called bouchard's nodes.
Comparison of Heberden's nodes (seen in patients with osteoarthritis) with Bouchard's nodes (seen in patients with rheumatoid arthritis). From Copstead and Banasik, 2000.
hemal n's nodes with a rich content of erythrocytes within sinuses, found near large blood vessels along the ventral side of the vertebrae and near the spleen and kidneys in various mammals, especially ruminants, having functions probably like those of the spleen; their presence in humans is doubtful.
Keith's node (Keith-Flack node) sinoatrial node.
Legendre's n's Bouchard's nodes.
lymph node see lymph node.
Osler's n's small, raised, swollen, tender areas, bluish or sometimes pink or red, due to inflammation around the site of lodgement of small infected emboli in distal arterioles; they occur commonly in the pads of the fingers or toes, in the palms, or in the soles and are practically pathognomonic for subacute bacterial endocarditis.
Parrot's n's bony nodes on the outer table of the skull of infants with congenital syphilis.
n's of Ranvier constrictions of myelinated nerve fibers at regular intervals at which the myelin sheath is absent and the axon is enclosed only by Schwann cell processes.
Schmorl's node an irregular or hemispherical bone defect in the upper or lower margin of the body of a vertebra into which the nucleus pulposus of the intervertebral disk herniates.
sentinel node
1. the first lymph node to receive drainage from a tumor; used to determine whether there is lymphatic metastasis in certain types of cancer. If this node is negative for malignancy, others “upstream” from it are usually also negative.
signal node an enlarged supraclavicular lymph node; often the first sign of a malignant abdominal tumor.
singer's n's vocal cord nodules.
sinoatrial node a collection of atypical muscle fibers in the wall of the right atrium where the rhythm of cardiac contraction is usually established; therefore also referred to as the pacemaker of the heart. Called also SA node.
syphilitic node a swelling on a bone due to syphilitic periostitis.
node of Tawara atrioventricular node.
teacher's n's vocal cord nodules.
Troisier's node (Virchow's node) sentinel node.

node

(nōd), [TA] Avoid using the simple word node in the sense of atrioventricular node or lymph node unless the meaning is clear from the context.
1. A knob or nodosity; a circumscribed swelling; in anatomy, a circumscribed mass of tissue.
2. A circumscribed mass of differentiated tissue.
3. A knuckle, or finger joint.
Synonym(s): nodus [TA]
[L. nodus, a knot]

node

(nōd) a small mass of tissue in the form of a swelling, knot, or protuberance, either normal or pathological.no´dal
atrioventricular node , AV node (AVN) a collection of Purkinje fibers beneath the endocardium of the right atrium, continuous with the atrial muscle fibers and atrioventricular bundle; it receives the cardiac impulses from the sinoatrial node and passes them on to the ventricles.
Bouchard's nodes  cartilaginous and bony enlargements of the proximal interphalangeal joints of the fingers in degenerative joint disease.
Dürck's nodes  granulomatous perivascular infiltrations in the cerebral cortex in trypanosomiasis.
Flack's node  sinoatrial n.
Heberden's nodes  small hard nodules, usually at the distal interphalangeal joints of the fingers, formed by calcific spurs of the articular cartilage and associated with osteoarthritis.
Hensen's node  primitive node.
Keith's node , Keith-Flack node sinoatrial n.
lymph node  any of the accumulations of lymphoid tissue organized as definite lymphoid organs along the course of lymphatic vessels, consisting of an outer cortical and an inner medullary part; they are the main source of lymphocytes of the peripheral blood and, as part of the reticuloendothelial system, serve as a defense mechanism by removing noxious agents, e.g., bacteria and toxins, and probably play a role in antibody formation.
Enlarge picture
Lymph node (nodus lymphoideus).
Osler's nodes  small, raised, swollen, tender areas, bluish or sometimes pink or red, occurring commonly in the pads of the fingers or toes, in the thenar or hypothenar eminences, or the soles of the feet; they are practically pathognomonic of subacute bacterial endocarditis.
primitive node  a mass of cells at the cranial end of the primitive streak in the early embryo.
nodes of Ranvier  constrictions of myelinated nerve fibers at regular intervals at which the myelin sheath is absent and the axon is enclosed only by Schwann cell processes.
Schmorl's node  an irregular or hemispherical bone defect in the upper or lower margin of the body of a vertebra.
sentinel node 
1. the first lymph node to receive drainage from a tumor; used to determine whether there is lymphatic metastasis in certain types of cancer.
signal node  an enlarged supraclavicular lymph node; often the first sign of a malignant abdominal tumor.
singer's nodes  vocal cord nodules.
sinoatrial node , sinuatrial node, sinus node a microscopic collection of atypical cardiac muscle fibers (Purkinje fibers) at the junction of the superior vena cava and right atrium, in which the cardiac rhythm normally originates and which is therefore called the cardiac pacemaker.
teacher's nodes  vocal cord nodules.
Troisier's node , Virchow's node signal n.

node

(nōd)
n.
1.
a. A knob, knot, protuberance, or swelling.
b. Medicine A small, well-defined mass of tissue that is either normal or pathological, as a lymph node or a node at an arthritic joint.
2.
a. A point or area where two lines, paths, or parts intersect or branch off: "The nodes, or branching points, are usually demarcated by sets of one or more new, evolutionary characters that typify all taxa" (Pat Shipley).
b. A focal point or a point of interaction: "Inside the hospital, she became a node of gossip, despite being unable to communicate in the usual way" (Oliver Sacks).
3.
a. Botany The point on a stem where a leaf is attached or has been attached; a joint.
b. See knot1.
4. Physics A point or region of virtually zero amplitude in a wave or periodic system.
5. Mathematics The point at which a continuous curve crosses itself.
6. Computers A terminal in a computer network.
7. Astronomy
a. Either of two diametrically opposite points at which the orbit of a planet intersects the ecliptic.
b. Either of two points at which the orbit of a satellite intersects the orbital plane of a planet.

node

[nōd]
Etymology: L, nodus, knot
1 a small rounded mass.
2 a lymph node.
3 a single computer terminal in a network of terminals and computers.

node

Cardiology An intrinsic pacemaker of the heart, composed of neural tissue. See Atrioventricular node, Sinoatrial node Decision-making Any point in a decision tree where choices occur or results assigned. See Chance node, Decision node, Outcome node Pathology
1. A circumscribed tissue mass. See Heberden's node, Singer's node.
2. Lymph node, see there. See Axillary node, Irish's node, Potato node, Sentinel node, Virchow's node.

node

(nōd) [TA]
1. A knob or nodosity; a circumscribed swelling.
2. anatomy A circumscribed mass of differentiated tissue, especially a lymph node.
Synonym(s): nodus.
[L. nodus, a knot]

node

(nod) [L. nodus, knot]
1. A knot, knob, protuberance, or swelling.
2. A constricted region.
3. A small rounded organ or structure.

Aschoff node

Atrioventricular node.

atrioventricular node

Abbreviation: AV node
A node of specialized cardiac muscle fibers in the lower interatrial septum that receives impulses from the sinoatrial node and transmits them to the bundle of His.
Synonym: Aschoff node See: atrioventricular bundle; conduction system of the heart for illus

Bouchard node

In osteoarthritis, bony enlargement of the proximal interphalangeal joints.

ectopic lymph node

A cluster of immunologically active cells inside a malignant tumor. The node may represent an attempt by the body to destroy foreign antigens on the tumor cell surface.

Haygarth nodes

Joint swelling seen in rheumatoid arthritis.

Heberden nodes

See: Heberden nodes

hemal node

A vascular node that structurally resembles a lymph node, present in certain ungulates. Synonym: hemal gland

Hensen node

See: Hensen, Christian Andreas Victor
Enlarge picture
LYMPH NODE

lymph node

A small encapsulated lymphoid organ that filters lymph. Lymph nodes are found at junctions or branches along the lymphatics. They provide sites where immune responses can be generated through the interaction of antigens, macrophages, dendritic cells and lymphocytes. See: illustration; immune response; inflammation; lymph; lymphocyteLymph nodes are 0.1-2.5 cm long kidney-shaped aggregates of lymphocytes and macrophages embedded in a meshwork reticulum composed of thin collagen fibers. At each lymph node, an artery enters through a surface indentation (the hilum) alongside an exiting vein and an exiting (efferent) lymphatic vessel; a number of afferent lymphatic vessels enter the lymph node at other sites. Inside lymph nodes, lymph slowly flows through endothelial sinuses lined by lymphocytes and macrophages. Macrophages remove macromolecules, particles, debris, and microorganisms from the lymph stream. Lymphocytes and antibodies move through the walls of the sinuses and into the passing lymph, while dendritic cells pass from the lymph into the lymphatic follicles, carrying antigens from the body's epithelia and from infected tissues. In the cortical region of the lymph node, the sinuses wind around lymphatic follicles, which are ovoid germinal centers packed with differentiating and proliferating B lymphocytes and surrounded by loose T lymphocytes. Lymphocytes and antibodies also enter and exit blood capillaries throughout the lymph node. Lymph nodes are most numerous in the neck, mediastinum, abdominal mesenteries, pelvis, the proximal limbs (the axillae and the groin), and along the posterior abdominal wall. Inside the chest and trunk, lymph nodes tend to be found along the veins near viscera.

Meynet nodes

See: Meynet nodes

neurofibril node

Ranvier's node.

Osler nodes

See: Osler nodes

Parrot nodes

See: Parrot nodes

piedric node

A node on the hair shaft seen in piedra.

primitive node

A knoblike structure at the anterior end of the primitive streak.
Synonym: Hensen knot; primitive knot

Ranvier node

See: Ranvier node

Schmorl node

A node seen in radiographs of the spine. It is caused by prolapse of the nucleus pulposus into the end plate of the vertebra.

sentinel node

1. A lymph node that receives drainage from a tumor and is likely to harbor metastatic disease before cancer cells have the opportunity to spread elsewhere.
2. Signal node.

signal node

Enlargement of one of the supraclavicular lymph nodes; usually indicative of primary carcinoma of thoracic or abdominal organs. Synonym: sentinel node (2); Troisier's node; Virchow node

singer's node

Noncancerous, callus-like growths on the inner parts of the vocal cords, usually caused by voice abuse or overuse. It is marked by a singer's hoarseness and an inability to produce the desired notes. It is treated by resting the voice. Surgical removal of the nodules is necessary if they do not respond to conservative therapy. Synonym: chorditis nodosa; laryngeal nodule

sinoatrial node

Abbreviation: SA node
A specialized group of cardiac muscle cells in the wall of the right atrium at the entrance of the superior vena cava. These cells depolarize spontaneously and rhythmically to initiate normal heartbeats.
Synonym: pacemaker (2); sinus node

sinus node

Sinoatrial node.

syphilitic node

Circumscribed swelling at the end of long bones due to congenital syphilis. The nodes are sensitive and painful during inflammation, esp. at night.
See: Parrot's nodes

Troisier's node

Signal node.

Virchow node

Signal node.

node

that part of a plant stem where leaves are attached or may develop from buds. See also INTERNODE.

node

small knob, circumscribed swelling, or mass of differentiated tissue
  • Heberden's node small exostoses at the terminal interphalangeal joints of fingers in osteoarthritis, formed due to abnormal bone modelling secondary to low-grade trauma and inflammation

  • lymph nodes round, oval or kidney-shaped lymphoid masses located along the course of lymphatic vessels, e.g. popliteal nodes; inguinal nodes

  • Ranvier node gap between successive myelin segments investing a nerve; they increase nerve impulse conduction rates (e.g. to 100m/s) as the impulse moves rapidly from node to node as salutatory conduction

  • sinoatrial node mass of specialized cardiac muscle fibres acting as the heart 'pacemaker'

node

(nōd) [TA]
1. A knob or nodosity; a circumscribed swelling; in anatomy, a circumscribed mass of tissue.
2. A circumscribed mass of differentiated tissue.
[L. nodus, a knot]

node (nōd),

n a swelling or protuberance.
node, brown, of hyperparathyroidism,
n a central giant cell lesion of the bone seen in hyperparathyroidism. Its microscopic appearance is similar to giant cell reparative granuloma and giant cell tumor.
node of Ranvier gaps,
n.pl nodes distributed at regularly spaced intervals along a myelinated nerve fiber. The intervals are 1 mm or more in length, and they function essentially as relay stations to facilitate the passage of an impulse.

node

pl. nodi; a small mass of tissue in the form of a swelling, knot or protuberance, either normal or pathological.

node of Aschoff and Tawara
atrioventricular node.
cutaneous node
an elevated, solid lump, without a necrotic center, about 0.5 inch diameter, caused by acute or chronic inflammation, with an unbroken surface. Called also cutaneous nodule.
Flack's node
see sinoatrial node.
hemal n's
see hemal node.
Keith's node, Keith-Flack node
see sinoatrial node.
lymph node
see lymph node.
n's of Ranvier
constrictions of myelinated nerve fibers at regular intervals of about 1 mm at which the myelin sheath is absent and theaxon is enclosed only by Schwann cell processes.
sinoatrial (S-A) node
see sinoatrial node.
node of Tawara
atrioventricular node.

Patient discussion about node

Q. tender protuding lymph node lump rt. arm pit aprox. 1/2" dia. any concerns or recommend treatment necessary?

A. lymph nodes can flare up any time you get infected in the armpit and all the area that it drains. i had it several times and it went away in the same manner that it came. i think that sometimes it caused because of a blockade done by deodorant. so i try to use this Chinese salt stone that doesn't contain aluminum.

More discussions about node