Anatomy Model of Male Urethra , Internal Features of prostatic Urethra скачать в хорошем качестве

Anatomy Model of Male Urethra , Internal Features of prostatic Urethra

4  Male urethra Pick your favorite study tool Videos   Quizzes   Both Male urethra Author: Sara Ferreira MD • Reviewer: Sophie Stewart Last reviewed: November 28, 2022 Reading time: 9 minutes  Male urethra Urethra masculina Synonyms: none The male urethra is an 18-22 cm long muscular tube that conveys urine from the urinary bladder to the exterior via an external opening in the perineum and also functions to provide an exit for semen (sperm) and glandular secretions during ejaculation. It runs from the internal urethral orifice of the bladder to the external urethral orifice located at the tip of the glans penis. When the penis is in a flaccid (non-erect) state, the urethra presents a double curvature. In males, this organ is divisible into four parts: preprostatic (intramural), prostatic, membranous (intermediate) and spongy (penile) parts.  The structure and function of the urethra are different between male and female anatomy. In males, the urethra is long, as it runs the length of the penis, and a part of the urinary system as well as the reproductive system. In females, the urethra is very short (about 4 cm long) and not part of the reproductive system. 4  Male urethra Pick your favorite study tool Videos   Quizzes   Both Male urethra Author: Sara Ferreira MD • Reviewer: Sophie Stewart Last reviewed: November 28, 2022 Reading time: 9 minutes  Male urethra Urethra masculina Synonyms: none The male urethra is an 18-22 cm long muscular tube that conveys urine from the urinary bladder to the exterior via an external opening in the perineum and also functions to provide an exit for semen (sperm) and glandular secretions during ejaculation. It runs from the internal urethral orifice of the bladder to the external urethral orifice located at the tip of the glans penis. When the penis is in a flaccid (non-erect) state, the urethra presents a double curvature. In males, this organ is divisible into four parts: preprostatic (intramural), prostatic, membranous (intermediate) and spongy (penile) parts.  The structure and function of the urethra are different between male and female anatomy. In males, the urethra is long, as it runs the length of the penis, and a part of the urinary system as well as the reproductive system. In females, the urethra is very short (about 4 cm long) and not part of the reproductive system. This article will describe the anatomy and function of the male urethra. Key facts about the male urethra Table quiz PartsPreprostatic, prostatic, membranous, spongy partsFunctionsAllows the passage of urine and semen to the exterior of the bodyArterial supplyProstatic branches of the inferior vesical and middle rectal arteriesVenous drainageDorsal vein of the penis and pudendal veinsLymphatic drainageDrain to internal and external iliac lymph nodesInnervationProstatic plexus Contents Preprostatic urethra Prostatic urethra Membranous urethra Spongy urethra Vasculature and lymphatics Arterial supply Venous return Lymphatic drainage Innervation Functions Clinical notes Urethral catheterization Developmental disorders Sources Show all Recommended video: Penis and male urethra [12:43] Structure of the penis and urethra seen on a longitudinal section. Preprostatic urethra  Preprostatic part of urethra Pars intramuralis urethrae masculinae Synonyms: Intramural part of urethra, Pars preprostatica urethrae The preprostatic urethra is the first part of the male urethra, which passes through the neck of the bladder, just below the internal urethral orifice. This part is also referred to as the intramural part of the urethra. The preprostatic urethra is about 0.5-1.5 cm in length but varies depending on whether the bladder is filled with urine or empty. This part of the urethra is surrounded by the smooth muscle of the internal urethral sphincter which prevents retrograde flow of semen into the bladder during ejaculation. Prostatic urethra   Prostatic part of urethra Pars prostatica urethrae 1/5 Synonyms: Urethra prostatica The prostatic urethra is the part of the urethra that passes through the prostate. It is about 3-4 cm long and extends between the preprostatic and the membranous part of the urethra. The posterior part of the prostatic urethra is marked by an elevation known as the urethral crest.he prostatic sinuses are two depressions on each side of the crest where the prostatic ducts empty prostatic fluid into the urethral lumen. The urethral crest enlarges to form a rounded elevation which is known as the seminal colliculus. In the center of the seminal colliculus is a small indentation, the prostatic utricle, an embryological remnant that is thought to be the homologue of the uterus. The ejaculatory ducts also open up in the prostatic urethra, on each side of the prostatic utricle. These ducts carry sperm from the testes and fluid from the seminal vesicles into the urethra. Thus the urinary and reproductive t