trigone

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trigone

 [tri´gōn]
2. the first three cusps of an upper molar tooth. adj., adj trigo´nal.
trigone of bladder a triangular region of the wall of the urinary bladder, an area in which the muscle fibers are closely adherent to the mucosa; its three angles correspond with the orifices of the ureters and urethra. Called also vesical trigone.
carotid trigone the triangular area bounded by the posterior belly of the digastric muscle, the sternocleidomastoid muscle, and the anterior midline of the neck. Called also superior carotid triangle.
olfactory trigone the triangular area of gray matter between the roots of the olfactory tract.
vesical trigone trigone of bladder.

tri·gone

(trī'gōn), [TA]
1. Synonym(s): trigonum
2. The first three dominant cusps (protocone, paracone, and metacone), taken collectively, of an upper molar tooth.
[L. trigonum, fr. G. trigōnon, triangle]

tri·gone

(trī'gōn) [TA]
1. Synonym(s): trigonum.
2. The first three dominant cusps (protocone, paracone, and metacone), taken collectively, of an upper molar tooth.
[L. trigonum, fr. G. trigōnon, triangle]

tri·gone

(trī'gōn) [TA]
First three dominant cusps (protocone, paracone, and metacone), taken collectively, of an upper molar tooth.
[L. trigonum, fr. G. trigōnon, triangle]
References in periodicals archive ?
Leaf cells isodiametric to elongate, 30-40 [micro]m wide in midleaf, trigones large and swollen, leaf base with a broad, ill-defined vitta; cuticle papillose.
Leaf cells isodiametric to elongate, 20-30 [micro]m wide in midleaf, trigones conspicuous but not swollen, triangular to elongate, sometimes confluent on longer walls; cuticle smooth.
Leaf cells subisodiametrical, 1530 [micro]m wide in midleaf, with rather small trigones, margin cells elongate and thicker-walled, forming a border; cuticle smooth.
Leaf cells subisodiametrical, 20-45 [micro]m wide in midleaf, without or with small trigones; cuticle smooth; oil bodies brown.
laetevirens but differs from the latter species by the more robust plants with darker brown stems, leaves more elongate, ovateoblong, with a broadly rounded apex, longly decurrent bases and no high shoulder, leaf cells without distinct trigones and with brown oil bodies, presence of underleaves and absence of vegetative reproduction.
30-55 [micro]m wide in midleaf, elongate, with conspicous, radiate trigones; leaf base without vitta; cuticle smooth.
subplana but in the latter species the leaves are rather symmetrically ovate-oblong and leaf cells are (sub) isodiametrical, without or with very small trigones.
Leaf cells slightly elongate, 35-55 [micro]m long and 25-33 [micro]m wide in midleaf, with rather small, radiate trigones, cells becoming more elongate and thickerwalled towards leaf base, forming an ill-defined vitta, cells at leaf margin slightly smaller, leaf border lacking; cuticle smooth; oil bodies not seen.
Leaf cells isodiametric to slightly elongate, 17-25 [micro]m wide in midleaf, 1-1.5x longer than wide, trigones small to large, not elongate, vitta lacking; cuticle smooth.
Leaf cells isodiametric to elongate, 15-25 [micro]m wide in midleaf, trigones conspicuous, slightly swollen; cuticle smooth.
20-35 [micro]m wide in midleaf, somewhat elongate, with large, swollen trigones; cuticle covered by small wax platelets, appearing smooth or weakly rough in the light microscope.
25-35 [micro]m wide in midleaf, somewhat elongate, with rather large, swollen trigones; cuticle smooth.