Describe the male urethra under the following headings:
- Male Urethra Introduction
- Male Urethra Parts and
- Male Urethra Applied anatomy.
Answer:
1. Male urethra Introduction: The male urethra is a long narrow membranous canal for urine and semen.
- It is 18–20 cm long.
- It is S-shaped, i.e., presents two curvatures.
- It extends from the internal urethral orifice at the neck of the bladder to the external urethral orifice at the tip of the glans penis.
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2. Male urethra Parts/divisions:
The male urethra is divided into the following 3 parts:
- Prostatic part
- Membranous part
- Spongy part
The details of the three parts are given in Table
Parts of the Male Urethra:
3. Male urethra Applied anatomy:
- Catheterization: During catheterization/instrumentation of the male urethra to empty the distended and painful bladder, the normal curvatures should be kept in mind. Otherwise, the forceful insertion of the metallic instrument may cause urethral rupture and create false passages.
- Urethritis and stricture: The infection of the urethra is called urethritis. Chronic urethritis may lead to urethral stricture.
- Rupture of the urethra: It may occur when a person falls astride with the perineum hitting a sharp object.
- Rupture of the urethra below the perineal membrane leads to extravasation of urine in the superficial perineal pouch, scrotum, penis, and lower part of the anterior abdominal wall deep to Scarpa’s fascia.
- The rupture of the urethra above the perineal membrane leads to extravasation of urine in the extraperitoneal space of the pelvis and lower part of the anterior abdominal wall.
Give a brief account of the development of the male Urethra.
Answer:
Male urethra develops at the end of the 3rd month of IUL as follows:
- Prostatic part
- Above the opening of ejaculatory ducts
- Anterior and lateral walls, from the vesicourethral canal
- Posterior wall, from absorbed mesonephric ducts
- Below the opening of ejaculatory ducts, from the pelvic part of the definitive urogenital sinus.
- Above the opening of ejaculatory ducts
- Membranous part: From the pelvic part of the definitive urogenital sinus.
- Penile part: From the phallic part of the definitive urogenital sinus.
- Terminal part: From surface ectoderm.
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