tubercle

(redirected from dysgonic tubercle (1))
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

tubercle

 [too´ber-k'l]
1. a nodule or small eminence, especially one on a bone, for attachment of a tendon; see also tuber and tuberosity. Called also tuberculum. adj., adj tuber´cular, tuber´culate.
2. a small, rounded nodule produced by the bacillus of tuberculosis (Mycobacterium tuberculosis). It is made up of small spherical cells that contain giant cells and are surrounded by spindle-shaped epithelioid cells.
fibrous tubercle a tubercle of bacillary origin that contains connective tissue elements.
Ghon tubercle Ghon focus.
mental tubercle a prominence on the inner border of either side of the mental protuberance of the mandible.
miliary tubercle one of the many minute tubercles formed in many organs in acute miliary tuberculosis.
pubic tubercle a prominent tubercle at the lateral end of the pubic crest.
supraglenoid tubercle one on the scapula for attachment of the long head of the biceps muscle.

tu·ber·cle

(tū'bĕr-kĕl),
1. A nodule, especially in an anatomic, not pathologic, sense.
2. A circumscribed, rounded, solid elevation on the skin, mucous membrane, surface of an organ, or the surface of a bone, the latter giving attachment to a muscle or ligament.
3. dentistry a small elevation arising on the surface of a tooth. Synonym(s): tuberculum [TA]
4. A granulomatous lesion due to infection by Mycobacterium tuberculosis. Although somewhat variable in size (0.5-3 mm in diameter) and in the proportions of various histologic components, tubercle's tend to be fairly well circumscribed, spheroid, firm lesions that usually consist of three irregularly outlined but moderately distinct zones: 1) an inner focus of necrosis, coagulative at first, which then becomes caseous; 2) a middle zone that consists of a fairly dense accumulation of large mononuclear phagocytes (macrophages), frequently arranged somewhat radially (with reference to the necrotic material) resembling an epithelium, and hence termed epithelioid cells; multinucleated giant cells of Langhans type may also be present; and 3) an outer zone of numerous lymphocytes, and a few monocytes and plasma cells. In instances in which healing has begun, a fourth zone of fibrous tissue may form at the periphery. Morphologically indistinguishable lesions may occur in diseases caused by other agents; many observers use the term nonspecifically, that is, with reference to any such granuloma; other clinicians use tubercle only for tuberculous lesions, and then designate those of undetermined causes as epithelioid-cell granulomas.
[L. tuberculum, dim. of tuber, a knob, a swelling, a tumor]

tubercle

/tu·ber·cle/ (-k'l)
1. any small, rounded mass produced by infection with Mycobacterium tuberculosis.
2. a nodule or small eminence, especially one on a bone for attachment of a tendon.
3. the cusp of a tooth.

anatomical tubercle  tuberculosis verrucosa cutis.
auricular tubercle , auricular tubercle of Darwin, darwinian tubercle a small projection sometimes found on the edge of the helix; conjectured by some to be a relic of simioid ancestry.
Farre's tubercles  masses beneath the capsule of the liver in some cases of hepatocellular carcinoma.
fibrous tubercle  one of bacillary origin which contains connective-tissue elements.
genial tubercle, inferior  inferior mental spine.
genial tubercle, superior  superior mental spine.
genital tubercle  an eminence ventral to the cloaca in the early embryo; the primordium of the penis or clitoris.
Ghon tubercle  see under focus.
gracile tubercle  an enlargement of the fasciculus gracilis in the medulla oblongata, produced by the underlying nucleus gracilis.
intervenous tubercle  a ridge across the inner surface of the right atrium between the openings of the venae cavae.
Lisfranc's tubercle  an eminence on the first rib, for attachment of the anterior scalene muscle.
Lower's tubercle  intervenous t.
mental tubercle  a prominence on the inner border of either side of the mental protuberance of the mandible.
miliary tubercle  one of the many minute tubercles formed in many organs in acute miliary tuberculosis.
pubic tubercle of pubic bone  a prominent tubercle at the lateral end of the pubic crest.
scalene tubercle  Lisfranc's t.
supraglenoid tubercle  one on the scapula for attachment of the long head of the biceps.

tubercle

(to͞o′bər-kəl)
n.
1. An anatomical nodule.
2. A small elevation on the surface of a tooth.
3. A nodule or swelling, especially a mass of lymphocytes and epithelioid cells forming the characteristic granulomatous lesion of tuberculosis.

tubercle

[t(y)o̅o̅′bərkəl]
Etymology: L, tuber, swelling
1 a nodule or a small eminence, such as that on a bone.
2 a nodule, especially an elevation of the skin that is larger than a papule, such as Morgagni's tubercles of the areolae of the breasts.
3 a small rounded nodule produced by infection with Mycobacterium tuberculosis, consisting of a gray translucent mass of small spheric cells surrounded by connective cells.

tubercle

Medtalk Bump, lump, nodule, protuberance, especially on a bone

tu·ber·cle

(tū'bĕr-kĕl)
1. A nodule, especially in an anatomic, not pathologic, sense.
Synonym(s): tuberculum (1) [TA] .
2. A circumscribed, rounded, solid elevation on the skin, mucous membrane, or surface of an organ.
3. A slight elevation from the surface of a bone giving attachment to a muscle or ligament.
4. dentistry A small elevation arising on the surface of a tooth.
5. A granulomatous lesion due to infection by Mycobacterium tuberculosis. Although somewhat variable in size (0.5-3 mm in diameter) and in the proportions of various histologic components, tubercles tend to be fairly well-circumscribed, spheroid, firm lesions that usually consist of three zones: 1) an inner focus of necrosis, coagulative at first and then becoming caseous; 2) a middle zone that consists of large mononuclear phagocytes (macrophages), frequently arranged somewhat radially (with reference to the necrotic material), resembling an epithelium and hence termed epithelioid cells; multinucleated giant cells of Langhans type may also be present; and 3) an outer zone of numerous lymphocytes and a few monocytes and plasma cells. In instances in which healing has begun, a fourth zone of fibrous tissue may form at the periphery. Morphologically indistinguishable lesions may occur in diseases caused by other agents; many observers use the term nonspecifically, i.e., with reference to any such granuloma; others use "tubercle" only for tuberculous lesions and designate those of undetermined causes as epithelioid-cell granulomas.
[L. tuberculum, dim. of tuber, a knob, a swelling, a tumor]

tubercle

1. A small nodular mass of tubercular tissue.
2. An informal term for TUBERCULOSIS.
3. Any small, rounded protrusion on a bone.

tubercle

a spherical or ovoid swelling.

tubercle

elevation/nodule on bone surface, smaller than a tuberosity; gives attachment to tendon

tubercle

granulomatous lesion/'cold abscess'; caused by local infection with Mycobacterium tuberculosis

tu·ber·cle

(tū'bĕr-kĕl)
1. [TA] In dentistry, a small elevation arising on the surface of a tooth.
2. [TA] A nodule, especially in an anatomic, not pathologic, sense.
3. Circumscribed, rounded, solid elevation on skin, mucous membrane, surface of an organ, or bone surface, the last giving attachment to a muscle or ligament.
4. A granulomatous lesion due to infection by Mycobacterium tuberculosis.
[L. tuberculum, dim. of tuber, a knob, a swelling, a tumor]

tubercle (too´burkəl),

n 1. a small rounded nodule or elevation on the surface of the skin, bone, or other tissue.
2. the accessory cusps on the cingulum of certain anterior teeth or occlusal tables of permanent molars.
tubercle, genial
n (geniohyoid tubercle), a small rounded elevation on the lingual surface of the mandible on either side of the midline near the inferior border of the body of the mandible, serving as a point of insertion for the geniohyoid muscles.
tubercle, geniohyoid
n See tubercle, genial.
tubercle, superior genial,
n the small spines on the lingual surface of the mandible that serve as the attachment for the genioglossus muscles. On resorbed mandibles, these tubercles may be at or above the crest of the residual ridge.
tubercle of the upper lip (superior labial),
n midline thickening of the superior lip.

tubercle

1. a small, rounded nodule produced by the bacillus of tuberculosis (Mycobacterium bovis). It is made up of small spherical masses that contain giant cells and are surrounded by spindle-shaped epithelioid cells.
2. a nodule or small eminence, especially one on a bone, for attachment of a tendon. See also cuneate tubercle.

dysgonic tubercle (1)
one from which it is difficult to culture mycobacteria, typical of Mycobacterium bovis.
eugonic tubercle (1)
one from which mycobacteria can be isolated with ease. Typical of Mycobacterium avium.
fibrous tubercle (1)
a tubercle of bacillary origin that contains connective tissue elements.
genital tubercle
see phallic tubercle (below).
gracile tubercle
a small swelling; used as an anatomical landmark; also an attachment for the gracilis nucleus in the medulla oblongata.
humerus tubercle
the point of the shoulder; the greater tubercle on the head of the humerus.
intercondylar t's
situated on the intercondylar eminence on the head of the tibia, there are medial and lateral tubercles. Called also intercondylar eminences.
intermediate humerus tubercle
a small ridge between the greater and lesser tubercles of the horse's humerus; it serves to restrain the bicipital tendon.
intervenous tubercle
a fold on the inner wall of the right atrium, directing the flow of blood from the venae cavae to the atrioventricular opening.
miliary tubercle
one of the many minute tubercles formed in many organs in acute miliary tuberculosis.
phallic tubercle
primordia of the penis; called also genital tubercle.
pubic tubercle
a prominent tubercle at the lateral end of the pubic crest.
supraglenoid tubercle
a tubercle on the scapula for attachment of the biceps muscle.