Male Genital System Overview

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Questions and Answers

What is the primary function of the testis?

Production of ovum and secretion of estrogen

Production of sperm and secretion of testosterone (correct)

Storage of sperm and absorption of nutrients

Secretion of seminal fluid and enzymes

Which of the following correctly describes the structure of the testis?

Covered by an outer tunica albuginea

Each lobule contains 5-7 seminiferous tubules

Divided by septa into 300 lobules

Has interstitial cells of Leydig that secrete testosterone (correct)

What is the primary role of Sertoli cells within the seminiferous tubules?

Formation of sperm

Supporting cells for sperm nutrition (correct)

Transport of sperm to the epididymis

Production of testosterone

Which part of the male genital system connects the testis to the epididymis?

Vasa efferentia Signup and view all the answers

How long is the male urethra approximately?

20 cm Signup and view all the answers

What is the main function of the epididymis?

Storage and maturation of sperm Signup and view all the answers

Where do the ejaculatory ducts terminate?

In the prostatic urethra Signup and view all the answers

Which structure conveys sperm from the epididymis to the ejaculatory duct?

Vas deferens Signup and view all the answers

Which part of the male urethra is the narrowest and shortest?

Membranous urethra Signup and view all the answers

What is the primary function of the prostate gland?

Secretion of seminal fluid Signup and view all the answers

Which part of the uterine (Fallopian) tubes is the widest and also the site of fertilization?

Ampulla Signup and view all the answers

What shape is the ovary described as?

Almond-shaped Signup and view all the answers

Which of the following glands opens its duct into the penile urethra?

Bulbourethral gland Signup and view all the answers

What is the shape of the uterus?

Pear Signup and view all the answers

Where is the infundibulum located within the uterine tubes?

Close to the ovary Signup and view all the answers

Which structure is responsible for carrying oocytes from the ovaries?

Uterine (Fallopian) tubes Signup and view all the answers

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.
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

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.
Covered by:
- Tunica albuginea: Strong fibrous capsule.
- Tunica vaginalis: Serous sac.

Epididymis

Shape: Comma-shaped mass.
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.
Parts:
- Prostatic Urethra: Widest part.
- Membranous Urethra: Narrowest and shortest part.
- Penile Urethra: Longest part.

Accessory Glands

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.
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

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.
Secondary Sex Organs:
- Duct System: Includes the fallopian tubes, uterus, and vagina.
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.
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.