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Questions and Answers
What is the primary function of the testis?
Which of the following correctly describes the structure of the testis?
What is the primary role of Sertoli cells within the seminiferous tubules?
Which part of the male genital system connects the testis to the epididymis?
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How long is the male urethra approximately?
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What is the main function of the epididymis?
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Where do the ejaculatory ducts terminate?
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Which structure conveys sperm from the epididymis to the ejaculatory duct?
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Which part of the male urethra is the narrowest and shortest?
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What is the primary function of the prostate gland?
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Which part of the uterine (Fallopian) tubes is the widest and also the site of fertilization?
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What shape is the ovary described as?
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Which of the following glands opens its duct into the penile urethra?
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What is the shape of the uterus?
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Where is the infundibulum located within the uterine tubes?
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Which structure is responsible for carrying oocytes from the ovaries?
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Study Notes
Male Genital System
-
Primary Sex Organs:
- Testes (2): Produce sperm and testosterone.
- Oval in shape
- Located: In the scrotal sac outside the abdominal cavity, requiring lower temperatures for sperm production.
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Secondary Sex Organs:
- Duct System: Includes the epididymis, vas deferens, ejaculatory ducts, and urethra.
- Accessory Glands: Consist of the seminal vesicle, prostate, and bulbourethral glands.
Testis
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Structure: Divided into 200 lobules by septa.
- Each lobule: Contains 1–3 seminiferous tubules.
- Each tubule: Contains germinal cells (produce sperm) and Sertoli cells (support cells for sperm nutrition).
- Testicular stroma: Contains interstitial cells of Leydig, which secrete testosterone.
- Vasa efferentia: Small tubules connecting the testis to the epididymis.
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Covered by:
- Tunica albuginea: Strong fibrous capsule.
- Tunica vaginalis: Serous sac.
Epididymis
- Shape: Comma-shaped mass.
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Structure: Highly coiled single duct of 6 meters long.
- Head: Connected to the testis by vasa efferentia.
- Body: Lies on the posterior surface of the testis.
- Tail: Continues as the vas deferens.
- Function: Storage and maturation of sperm.
Vas Deferens
- Location: Begins at the tail of the epididymis and ends by joining the duct of the seminal vesicle to form the ejaculatory duct.
- Function: Conveys sperm from the epididymis to the ejaculatory duct.
Ejaculatory Ducts
- Formation: Union of the vas deferens and the duct of the seminal vesicle.
- Termination: Opens into the prostatic urethra.
Male Urethra
- Shape and Length: S-shaped and 20 cm long.
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Parts:
- Prostatic Urethra: Widest part.
- Membranous Urethra: Narrowest and shortest part.
- Penile Urethra: Longest part.
Accessory Glands
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Seminal Vesicles (2):
- Location: On the urinary bladder base.
- Seminal Vesicle Duct: Joins the vas deferens to form the ejaculatory duct.
- Function: Secretes seminal fluid for sperm nutrition.
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Prostate (1):
- Shape: Inverted pyramid.
- Location: Below the neck of the bladder.
- Traversed by: Prostatic urethra and ejaculatory ducts.
- Function: Secretes seminal fluid for sperm nutrition.
-
Bulbourethral (Cowper's) Glands (2):
- Shape: Two pin-head glands.
- Location: Beside the membranous urethra, its duct opens into the penile urethra.
Female Genital System
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Primary Sex Organ:
- Ovaries (2): Produce ova (eggs) and secrete the female sex hormones progesterone and estrogen.
- Shape: Almond-shaped gland.
- Location: In the pelvis, lateral to the uterus.
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Secondary Sex Organs:
- Duct System: Includes the fallopian tubes, uterus, and vagina.
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External Genital Organs:
- Vulva (includes clitoris, labia majora, and labia minora).
Ovary
- Function: Production of ova and secretion of progesterone and estrogen.
Uterine (Fallopian) Tubes
- Location: Between the ovary and the uterus.
- Length: About 10 cm.
-
Parts:
- Infundibulum: Lies close to the ovary and has fimbria (finger-like projections).
- Ampulla: Widest part of the tube, site of fertilization.
- Isthmus: The narrowest part of the tube.
- Intra-mural part: Lies in the wall of the uterus.
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Functions:
- Carry oocytes from the ovaries.
- Carry sperm from the uterus.
- Site of fertilization.
- Carry the zygote to the uterine cavity.
Uterus
- Shape: Pear-shaped, thick-walled, muscular organ.
- Location: In the pelvic cavity.
-
Parts:
- Fundus: Lies above the entrance of the uterine tubes.
- Body: The part below the entrance of the uterine tubes, main triangular part.
- Cervix: Lower cylindrical part, forms the lower 1/3 of the uterus.
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Description
This quiz delves into the male genital system, covering primary and secondary sex organs, including the testes and their structures. It explores the role of accessory glands and the duct system in male reproduction. Test your knowledge on the anatomical and functional aspects of male genitalia.
