Definitions
from The Century Dictionary.
- noun In anatomy, a triangular space or area.
- noun The trigonal space or area at the base of the urinary bladder, whose apex is at the beginning of the urethra, and whose other two angles are at the points of entrance of the ureters into the bladder: more fully called
trigonum vesicæ . - noun A triangular depressed space between the pulvinar and the peduncle of the pineal body; more fully called
trigonum habenulæ .
Etymologies
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Examples
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Behind, it is limited medially by a groove, the sulcus habenulæ, which intervenes between it and a small triangular area, termed the trigonum habenulæ.
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Over a small triangular area, termed the trigonum vesicæ, immediately above and behind the internal orifice of the urethra, the mucous membrane is firmly bound to the muscular coat, and is always smooth.
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Above the pons these ascending fibers come to the surface at the side of the reticular formation in the trigonum lemnisci and are covered by a layer of ependyma.
IX. Neurology. 4e. Composition and Central Connections of the Spinal Nerves 1918
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The orifices of the ureters are placed at the postero-lateral angles of the trigonum vesicæ, and are usually slit-like in form.
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Other fibers probably pass to the uncus and hippocampal gyrus from the primary olfactory centers in the trigonum and anterior perforated substance.
IX. Neurology. 4e. Composition and Central Connections of the Spinal Nerves 1918
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The trigonum olfactorium, anterior perforated substance and the adjoining part of the septum pellucidum are important primary olfactory centers, especially for olfactory reflexes; in these centers terminate many axons from the mitral cells of the olfactory bulb.
IX. Neurology. 4e. Composition and Central Connections of the Spinal Nerves 1918
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The internal urethral orifice is placed at the apex of the trigonum vesicæ, in the most dependent part of the bladder, and is usually somewhat crescentic in form; the mucous membrane immediately behind it presents a slight elevation, the uvula vesicæ, caused by the middle lobe of the prostate.
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The anterior angle of the trigonum vesicæ is formed by the internal orifice of the urethra: its postero-lateral angles by the orifices of the ureters.
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This nucleus is about 2 cm. in length, and its upper part corresponds with the trigonum hypoglossi, or lower portion of the medial eminence of the rhomboid fossa (page 779).
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Over the trigonum vesicæ the mucous membrane is closely attached to the muscular coat, and is not thrown into folds, but is smooth and flat.
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