Prof. Ahmed Fathalla Ibrahim

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Prof. Ahmed Fathalla Ibrahim URETERS URINARY BLADDER URETHRA Prof. Ahmed Fathalla Ibrahim

OBJECTIVES At the end of the lecture, students should be able to: Describe the course of ureter & identify the site of ureteric constriction Describe the important relations & identify certain areas (trigone, uvula vesicae) in the base of urinary bladder. List the blood supply, lymphatic drainage & nerve supply of urinary bladder Differentiate between male & female urethra regarding length, structure, course & function.

THE URETER-1 DEFINITION: It is a muscular tube transporting urine from kidney to urinary bladder. LENGTH: 25 – 30 cm BEGINNING: It begins as a continuation of renal pelvis.

THE URETER-2 COURSE IN ABDOMEN: It descends anterior to psoas major muscle (opposite the tips of lumbar transverse processes). It crosses the end (bifurcation) of common iliac artery to enter the pelvis.

THE URETER-3 COURSE IN PELVIS & TERMINATION: It runs downward & backward to the level of ischial spine. It curves forward to open in upper lateral angles of the base of urinary bladder. It runs obliquely for ¾ inch in wall of bladder before opening (valve-like part).

THE URETER-4 SITE OF CONSTRICTION (OBSTRUCTION-STONE IMPACTION) At ureteropelvic junction At pelvic inlet (site of crossing of common iliac artery) At site of entrance to bladder ARTERIAL SUPPLY: Renal artery Gonadal artery Common iliac artery Internal iliac artery

THE URINARY BLADDER Anterior Aspect Posterior Aspect Upper surface Infero-lateral surface Infero-lateral surface Apex Anterior Aspect Neck Base Posterior Aspect

THE URINARY BLADDER-1 (SHAPE) It has the shape of three-sided pyramid placed on one of its angle (NECK). It has: An APEX: directed anteriorly A BASE: directed posteriorly A SUPERIOR SURFACE Two INFERO-LATERAL SURFACE

THE URINARY BLADDER-2 (APEX) Median umbilical ligament Is directed forward Is related to upper border of symphysis pubis Is connected to umbilicus by the median umbilical ligament (remnant of urachus) Male Median umbilical ligament Female

THE URINARY BLADDER-3 (BASE) Is directed backward IN MALE: Is related to vas deferens & seminal vesicle of both sides IN FEMALE: Is related to vagina Male Female

THE URINARY BLADDER-4 (SUPERIOR SURFACE) IN MALE: Is related to coils of ileum & sigmoid colon IN FEMALE: Is related to the uterus Male Female

THE URINARY BLADDER-5 (INFERO-LATERAL SURFACES) Are related to retropubic fat separating them from pubic bones Retropubic fat Accomodates distention of bladder Continuous with anterior abdominal wall. Rupture of bladder escape of urine to anterior abdominal wall Male Female

THE URINARY BLADDER-6 (NECK) Is the lowest & most fixed part of urinary bladder Is continuous with urethra Is related to lower border of symphysis pubis IN MALE: Is related to upper surface of prostate gland Male Female

THE URINARY BLADDER-7 (INTERIOR) Trigone: a triangular area in base of bladder bounded by the 2 ureteric orifices & internal urethral orifice. Its mucous membrane is elastic (not folded) Mucous membrane is folded. Uvula vesicae: elevation behind internal urethral orifice, produced by median lobe of prostate gland

THE URINARY BLADDER-8 (CAPACITY) DISTENDED Is circular in shape Bulges into abdominal cavity EMPTY Accomodates from 300 – 500 ml of urine

THE URINARY BLADDER-9 (POSITION) Is found in abdomen until age of 6 years Begins to enter the enlarging pelvis from age of 6 years onward Is found entirely in pelvis at puberty A median sagittal section of a newborn female child

THE URINARY BLADDER-10 (SUPPLY) ARTERIES: from internal iliac artery VEINS: into internal iliac vein LYMPH: into internal iliac lymph nodes NERVES: Parasympathetic: pelvic splanchnic nerves from S2, 3, 4 Sympathetic: from L1,2 Sensory: transmitting pain due to overdistention of bladder

MALE URETHRA (LENGTH: 20 CM) PROSTATIC URETHRA (Length=3 cm): Widest & most dilatable Extends from neck of bladder inside prostate gland MEMBRANOUS URETHRA (Length=1 cm): Surrounded by external urethral sphincter PENILE (SPONGY) URETHRA (Length=16 cm): Extends inside penis & opens externally through external urethral orifice (narrowest part of whole urethra) Ejaculatory duct Structures openings into prostatic urethra: Ejaculatory ducts: containing sperms & secretion of seminal vesicles Ducts of prostate gland

FEMALE URETHRA (LENGTH: 4 CM) Has only urinary function Extends from neck of urinary bladder to open externally through the external urethral orifice (anterior to the vaginal opening)

INTRAVENOUS UROGRAM A urogram (Post micturation): demonstrates a bladder stone.

SUMMARY-1 URETER: Beginning: as continuation of renal pelvis Course: descends anterior to: psoas major & end (bifurcation) of common iliac artery. Termination: opens at upper lateral angle of base of urinary bladder Sites of constriction: at uteropelvic junction, at pelvic inlet, at site of entrance of bladder Arterial supply: renal, gonadal, common & internal iliac arteries

SUMMARY-2 URINARY BLADDER: Apex: related to symphysis pubis, continuous with median umbilical ligament Base: related to vas deferens & seminal vesicle (in male) & to vagina (in female) Superior surface: related to coils of ileum & sigmoid colon (in male) & to uterus (in female) Inferolateral surfaces: related to retropubic fat Neck: continuous with urethra, related to upper surface of prostate gland (in male) Trigone: lies in the base of bladder, bounded by ureteric orifices & internal urethral orifice, its mucous membrane is elastic Uvula vesicae: dilatation behind internal urethral orifice, produced by the median lobe of the prostate gland Supply: internal iliac (artery, vein, lymph nodes) Nerves: parasympathetic (S2,3,4), sympathetic (L1,2)

SUMMARY-3 MALE URETHRA: Function: both urinary & genital Length: 20 cm, divided into prostatic (3 cm), membranous (1 cm) & penile ( 16 cm) Course: Extends from neck of bladder to opens externally through external urethral orifice (narrowest part of whole urethra) FEMALE URETHRA: Function: urinary only Length: 4 cm Course: Extends from neck of bladder to external urethral orifice (anterior to vaginal opening)

QUESTION 1 Which one of the following structures is related to the inferolateral surface? Prostate gland Sigmoid colon Retropubic fat Seminal vesicle

QUESTION 2 Which one of the following is the site of uvula vesicae? In the superior surface of urinary bladder. Behind the internal urethral orifice. Between the 2 ureteric orifices. In relation to the apex of urinary bladder.

THANK YOU & BEST WISHES