Size of three ureteral strictures
The ureter has three narrow parts, so what are the sizes of the three narrow parts of the ureter?
The human ureter has three narrow parts. The first stricture is the junction of renal pelvis and ureter, and the diameter of ureter is about 0.2cm. The second stricture is the intersection of ureter and iliac vessels, and the diameter of ureter is about 0.3cm. The third stricture is the part of ureter that obliquely passes through the bladder wall, also called the inner segment of ureter wall, with a diameter of about 1-2mm, which is also the narrowest part of the three strictures. Ureteral tri-stenosis is the site where ureteral calculi are easy to stay.
Urethra is located in retroperitoneum, which is a tubular structure composed of muscular mucosa, starting from the renal pelvis and ending in the triangular area of bladder. Male body length is 27-30 cm, with an average of 28 cm; Female body length is 25-28 cm, with an average of 26 cm. The right side is about 1 cm shorter than the left side. Clinically, the urethra is divided into upper, middle and lower segments, which can also be called abdominal segment, pelvic segment and bladder segment: the abdominal segment starts from the junction of renal pelvis and urethra and reaches the place outside iliac artery. Pelvic segment, from iliac artery to bladder wall. Bladder segment, inclined from bladder wall to bladder mucosa and urethral orifice.
Names of three kinds of ureteral strictures
The ureter is narrow in some places. What are the names of the three narrow parts of ureter?
The three strictures of ureter in human body are, from top to bottom, the stricture at the junction of renal pelvis and ureter (i.e. the beginning of ureter), the stricture at the junction of ureter and iliac vessels (i.e. the entrance of small renal pelvis) and the stricture inside ureter and bladder wall (i.e. the junction of ureter and bladder wall). These three physiological strictures are the areas where urinary calculi are easy to incarcerate and cause ureteral calculi.
At present, the upper 1/3 ureter is supplied by renal artery branches, the middle 1/3 ureter is supplied by abdominal aorta, common iliac artery, internal spermatic artery or uterine artery, and the lower 1/3 ureter is supplied by inferior bladder artery. After reaching the ureter, these branches are distributed in the fascia layer and communicate with each other from top to bottom, forming an arterial network and then spreading to other layers. Therefore, when doing ureteral transplantation, cutting off the lower 1/3 blood flow has little effect on the blood supply of the transplantation site. Ureteral vein returns with artery. Veins return to fascia through submucosa, and then return from kidney, ilium, spermatic cord, uterus, bladder vein, etc.
The narrowest of the three ureteral strictures.
The three ureteral strictures are different in size, so which position is the narrowest in the three ureteral strictures?
Ureter is an important structure of human urogenital system. There are two ureters, the main function of which is to drain urine. There are three strictures of ureter, one at the junction of renal pelvis and ureter, one at the intersection of ureter and common iliac artery, and one at the place where ureter enters bladder. Generally speaking, these three strictures of ureter often cause stones to stay, and the third stricture, the inner segment of ureter wall, is the narrowest.
Ureteral nerve is an autonomic nerve, which originates from the kidney and lower abdominal plexus, and is distributed in the connective tissue of ureter in a network, and then enters the muscular layer. Most ganglion cells are found in the lower ureter, a few in the upper ureter and a few in the middle ureter. Because of the peristalsis of ureter, it can be changed by drugs like sympathetic nerve and parasympathetic nerve. Even if these nerves are damaged, the peristalsis of ureter will not be affected.
Anatomy of three kinds of ureteral strictures
The structure of ureter is not complicated. What are the anatomy of three narrow parts of ureter?
The third narrow part of the ureter is dissected as the ureter abdomen: the ureter abdomen starts from the lower end of the renal pelvis at the upper part of the second lumbar vertebra, descends in front of the psoas major and reaches the upper mouth of the small renal pelvis. This ureter is clinically called "ureter abdomen".
The anatomy of the three narrow parts of ureter also includes the ureteropelvic part: because the ureter abdomen ends at the upper mouth of the small renal pelvis, the ureteropelvic part starts at the upper mouth of the small renal pelvis, then goes forward, downward and inward, and finally connects with the inside of the ureteric wall at the bottom of bladder.
Anatomy of the third ureteral stricture also includes the inner side of the wall: after reaching the upper corner of the bladder floor, the pelvic part of the ureter obliquely penetrates the whole layer of the bladder wall inward and downward, and opens at the ureteral orifice of the bladder triangle. This section of ureter located in the bladder wall is about 65438±0.5cm long, which is called "intramural" clinically.