Trigone

(anatomy) A triangular area inside the bladder limited by the openings of the ureters and urethra.
(botany) A thickening of plant cell walls formed when three or more cells adjoin.

1. A triangle or trigonum.
2. The first three dominant cusps of an upper molar tooth.

1. a triangular area. See also triangle.
2. the primary three cusps of an upper cheek tooth.

• olfactory t. — the triangular area of gray matter between the roots of the olfactory tract.
• vesical t. — a triangular region of the wall of the urinary bladder, the three angles corresponding with the orifices of the ureters and urethra; it is an area in which the muscle fibers are closely adherent to the mucosa.

Trigone (Latin for triangle) can refer to:

• Trigone of urinary bladder
• Fibrous trigone (of the heart)
• Olfactory trigone
• Trigone of the lateral ventricle

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