from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Thickenings of the cell wall at the angles where several cells join.
- n. A smooth triangular area on the inner surface of the bladder, bounded by the apertures of the ureters and urethra.
from the GNU version of the Collaborative International Dictionary of English
- n. A smooth triangular area on the inner surface of the bladder, limited by the apertures of the ureters and urethra.
from The Century Dictionary and Cyclopedia
- n. The trigonum of the bladder. See trigonum .
Sorry, no etymologies found.
An aperture of entry still open existed in the centre of the anterior wall of the bladder, and a patent exit opening at the base of the trigone.
In Fig. 1, which shows the healthy state of the neck of the bladder, unmarked by the prominent lines which are said to bound the space named "trigone vesical," or by those which indicate the position of the "muscles of the ureters," the third lobe does not exist.
Behind the trigone a depression called "bas fond" is formed in the base of the bladder.
The form of that portion of the base of the bladder which is named "trigone vesical" constitutes an equilateral triangle, and may be described by two lines drawn from the vesical orifice to both openings of the ureters, and another line reaching transversely between the latter.
Finally, the ureters run obliquely for about 2 cm. through the wall of the bladder and open by slit-like apertures into the cavity of the viscus at the lateral angles of the trigone.
The vesico-urethral portion absorbs the ends of the Wolffian ducts and the associated ends of the renal diverticula, and these give rise to the trigone of the bladder and part of the prostatic urethra.
Stretching behind the latter openings is a slightly curved ridge, the torus uretericus, forming the base of the trigone and produced by an underlying bundle of non-striped muscular fibers.
It consists of the olfactory bulb and tract, the olfactory trigone, the parolfactory area of Broca, and the anterior perforated substance.
The lateral olfactory striæ curve lateralward, a few of the fibers end in the olfactory trigone and the antero-lateral portion of the anterior perforated substance.
The most direct path, the tractus olfactomesencephalicus (basal olfactory bundle of Wallenburg), is supposed to arise from cells in the gray substance of the olfactory tract, the olfactory trigone, the anterior perforated substance and the adjoining part of the septum pellucidum.