Trigone of urinary bladder: it is situated interior of base of urinary bladder
Boundary:
Distance between ureter to ureter 2.5 cm
Distance between ureter to urethra 2.5 cm
But in distended bladder it is 5 cm
Inter-ueteric fold is formed by continuity of the
longitudinal muscles of ureters across the bladder
Ureteric orifice close by distension of urinary bladder but
it open rhythmically in response to ureteric peristalsis and a jet of urine
injected into bladder (4 or 5 times a minute normally )
Trigone contain two group of muscles
Superficial trigone
muscle :
1.
a triangular layer of muscles, morphologically
distinct component of the trigone
2.
it contain small diameter smooth muscle cells
3.
it is a thin muscle layer except at
interureteric fold and urethra-ureteric fold where it is thicken
4.
in both sex it is continuous with muscles of
ureter and urethra and in male it is also continuous with muscles of
ejaculatory duct near the opening
5.
different from other part of urinary bladder ,
it is rich in sympathetic supply
Deep trigone detrusor
muscle
Sympathetic supply of
urinary bladder:
1.
Vasomotor
2.
Inhibit detrusor muscle
1.
Motor to superficial trigone muscle and muscles
of bladder neck in male
Parasympathetic
supply of urinary bladder
1.
Contraction of detrusor muscle
2.
Sense of filing – travel by parasympathetic
system then spinal cord then by tract of gracile
3.
But pain sensation travel by both sympathetic
and parasympathetic then lateral spinothalamic tract
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