thyroid cartilage

(redirected from cartilages of larynx)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to cartilages of larynx: thyroid cartilage

cartilage

 [kahr´tĭ-lij]
a specialized, fibrous connective tissue present in adults, and forming most of the temporary skeleton in the embryo, providing a model in which most of the bones develop, and constituting an important part of the organism's growth mechanism; the three most important types are hyaline cartilage, elastic cartilage, and fibrocartilage. Also, a general term for a mass of such tissue in a particular site in the body.
 Involvement of joint and cartilage in osteoarthritis. From ARHP Arthritis Teaching Slide Collection, American College of Rheumatology.
alar c's the cartilages of the wings of the nose.
aortic cartilage the second costal cartilage on the right side.
arthrodial cartilage (articular cartilage) that lining the articular surfaces of synovial joints.
arytenoid c's two pyramid-shaped cartilages of the larynx.
connecting cartilage that connecting the surfaces of an immovable joint.
costal cartilage a bar of hyaline cartilage that attaches a rib to the sternum in the case of true ribs, or to the immediately above rib in the case of the upper false ribs.
cricoid cartilage a ringlike cartilage forming the lower and back part of the larynx.
diarthrodial cartilage articular cartilage.
elastic cartilage cartilage that is more opaque, flexible, and elastic than hyaline cartilage, and is further distinguished by its yellow color. The ground substance is penetrated in all directions by frequently branching fibers that give all of the reactions for elastin.
ensiform cartilage xiphoid process.
fibrous cartilage fibrocartilage.
floating cartilage a detached portion of semilunar cartilage in the knee joint.
hyaline cartilage flexible, somewhat elastic, semitransparent cartilage with an opalescent bluish tint, composed of a basophilic fibril-containing substance with cavities in which the chondrocytes occur.
 Hyaline cartilage. The matrix nearest the chondrocytes is intensely staining; although the matrix appears homogeneous, collagen fibrils may be visualized by polarized light or electron microscopy. From Dorland's, 2000.
Meckel's cartilage the ventral cartilage of the first branchial arch.
permanent cartilage cartilage that does not normally become ossified.
Reichert's cartilage the dorsal cartilage of the second branchial arch.
reticular cartilage elastic cartilage.
semilunar cartilage one of the two interarticular cartilages of the knee joint.
temporary cartilage cartilage that is normally destined to be replaced by bone.
thyroid cartilage the shield-shaped cartilage of the larynx, underlying the laryngeal prominence on the surface of the neck.
vomeronasal cartilage either of the two narrow strips of cartilage, one on each side, of the nasal septum supporting the vomeronasal organ.
yellow cartilage elastic cartilage.

thy·roid car·ti·lage

[TA]
the largest of the cartilages of the larynx; it is formed of two approximately quadrilateral plates (laminae) joined anteriorly at an angle of from 90-20°, the prominence so formed constituting the laryngeal prominence (Adam's apple).
Synonym(s): cartilago thyroidea [TA]

thyroid cartilage

n.
The largest cartilage of the larynx, having two broad processes that join anteriorly to form the Adam's apple.

thyroid cartilage

the largest cartilage of the larynx, consisting of two laminae fused together at an acute angle in the midline of the anterior neck to form the Adam's apple. Compare cricoid.

thy·roid car·ti·lage

(thī'royd kahr'ti-lăj) [TA]
The largest of the cartilages of the larynx; it is formed of two approximately quadrilateral plates joined anteriorly at an angle of from 90-120°, the prominence so formed constituting the laryngeal prominence.
Synonym(s): cartilago thyroidea [TA] .

thyroid cartilage

The largest of the cartilages of the LARYNX, consisting of two backward-sloping, broad processes joined in front to form the protuberance in the neck known popularly as the Adam's apple.

thyroid cartilage,

n the anterior midline prominence of the larnyx; also known as the
Adam's apple.

cartilage

a specialized, gristly connective tissue present in both mature animals and embryos, providing a model in which most of the bones develop, and constituting an important part of the organism's growth mechanism; the three most important types are hyaline cartilage, elastic cartilage and fibrocartilage. Also, a general term for a mass of such tissue in a particular site in the body.

alar c's
the cartilages of the wings of the nose.
annular ear cartilage
a ring of cartilage interposed between the rolled-up auricular cartilage and the skull.
arthrodial cartilage, articular cartilage
that clothing the articular surfaces of synovial joints.
arytenoid c's
two pyramid-shaped cartilages of the larynx.
auricular cartilage
cartilage of the pinna and much of the external ear canal.
cartilage canals
tunnels containing blood vessels incorporated in developing cartilage.
connecting cartilage
that connecting the surfaces of an immovable joint.
costal cartilage
a bar of hyaline cartilage that attaches a rib to the sternum in the case of true ribs, or to the immediately cranial rib in the case of the anterior false ribs.
cricoid cartilage
a ringlike cartilage forming the caudal part of the larynx.
diarthrodial cartilage
articular cartilage.
distal phalangeal cartilage
the ungual cartilages of the third phalanx in the horse lie mostly against the hoof wall but can be palpated if ossified. See also sidebone.
elastic cartilage
cartilage that is more opaque, flexible and elastic than hyaline cartilage, and is further distinguished by its yellow color. The ground substance is penetrated in all directions by frequently branching fibers that give all of the reactions for elastin.
cartilage emboli
see fibrocartilaginous embolic myelopathy.
ensiform cartilage
xiphoid process.
fibrous cartilage
fibrocartilage.
floating cartilage
a detached portion of semilunar cartilage in the stifle joint.
hoof cartilage
see distal phalangeal cartilage (above).
hyaline cartilage
flexible, somewhat elastic, semitransparent cartilage with an opalescent bluish tint, composed of a basophilic fibril-containing substance with cavities in which the chondrocytes occur.
interarytenoid cartilage
an occasional cartilage located between the two arytenoid cartilages.
nasal cartilage
rostral end to the internasal septum, separating the nasal cavities and anchoring the other cartilages around the nostrils.
parapatellar cartilage
cartilaginous plates medial and lateral to the patella in some species, e.g. dogs.
permanent cartilage
cartilage that does not normally become ossified.
retained enchondral cartilage cores
occur in ulnar metaphysis and lateral femoral condyles of young, giant breed dogs. Visible radiographically as radiolucent inverted cones, extending into the metaphysis, they are often associated with growth deformities such as forelimb valgus and genu valgum.
reticular cartilage
elastic cartilage.
scapular cartilage
dorsal extension of the scapula in ungulates; tends to calcify with age.
cartilage scissors
used for ear cropping in dogs.
semilunar cartilage
one of the two intra-articular cartilages of the stifle joint.
temporary cartilage
cartilage that is normally destined to be replaced by bone.
thyroid cartilage
the unpaired cartilage of the larynx to which the vocal folds attach.
tibial cartilage
the bed of cartilage located on the caudal surface of the intertarsal joint of birds; the tendons of the digital flexors pass through it.
ungual cartilage
see distal phalangeal cartilage (above).
vomeronasal cartilage
either of the two narrow strips of cartilage, one on each side, of the nasal septum supporting the vomeronasal organ.
xiphoid cartilage
posterior continuation of the sternum; supports the anterior abdominal wall, especially the linea alba.
yellow cartilage
elastic cartilage.

thyroid

1. resembling a shield.
2. the thyroid gland (see below) secreting thyroid hormones (see below).
3. a pharmaceutical preparation of cleaned, dried, powdered thyroid gland, obtained from those domesticated animals used for food by humans.

accessory thyroid
an additional thyroid located anywhere from the larynx to diaphragm, e.g. intrapericordial aorta; may be sufficient to supply the patient's need of thyroid hormone. Most common in dogs.
thyroid C cell
see c cell.
thyroid cartilage
the shield-shaped cartilage of the larynx.
thyroid diverticulum
primordium of the thyroid gland; appears as an outgrowth of the foregut between the first two pharyngeal pouches. This tube of epithelial cells grows ventrally into mesenchyme; the tube becomes the thyroglossal duct, the tip divides into two lobes, the thyroid glands.
thyroid dysfunction
ectopic thyroid
migration of thyroid diverticulum tissue to aberrant sites occurs, e.g. thyroid tissue in the thymus. These cause no apparent abnormality.
thyroid extract
a pharmaceutical substance derived from thyroid glands, used in the treatment of hypothyroidism. See thyroid (3) (above).
thyroid function tests
used to assess the functional capacity of the thyroid glands; most commonly employed in dogs and cats. Include plasma T4, plasma T3, free T4 radioiodine uptake, and TSH response tests.
thyroid gland
the largest of the endocrine glands, situated in the neck caudal to the larynx. It produces hormones (see below) that are vital in maintaining normal growth and metabolism. It also serves as a storehouse for iodine.
Enlarge picture
Microscopic appearance of the thyroid gland. By permission from Guyton R, Hall JE, Textbook of Medical Physiology, Saunders, 2000
thyroid hormones
iodothyronines secreted by the thyroid gland, principally thyroxine (tetraiodothyronine, T4) and tri-iodothyronine (T3); derived from iodination of tyrosyl residues in thyroglobulin. The pharmaceutical names for T4 and T3 are levothyroxine and liothyronine, respectively. Regulate basal metabolic rate.
thyroid parafollicular cell
see c cell.
thyroid radioiodine uptake
used as a thyroid function test but superseded these days by estimates of T4 (thyroxine).
thyroid-stimulating hormone (TSH)
thyroid tumor
mostly follicular adenomas in old-aged dogs, cats and horses; papillary adenomas are rare.