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Questions and Answers
What is the main function of Sertoli cells in the seminiferous tubules?
What is the name of the structure that forms when vasa efferentia gather together?
What type of cells line the vasa efferentia?
What is the length of the duct of epididymis?
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What is the name of the structure that branches and anastomoses in the mediastinum testis?
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What is the name of the duct that receives sperm from the epididymis?
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What is the diameter of the duct of epididymis?
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What is the function of the epididymis?
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What type of epithelium is found in the epididymis?
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Which part of the urethra is the longest?
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What is the function of the epididymis?
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What type of muscles surrounds the vas deferens?
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What is the length of the ejaculatory duct?
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What is the function of the testis?
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What type of epithelium is found in the prostatic urethra?
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What is the characteristic of the epithelium in the mucosa of the vas deferens?
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What is the function of the prostatic acini?
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What is the main component of seminal fluid?
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What is the function of the bulbourethral glands?
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What is the epithelial lining of the prostate gland?
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What is the function of the seminal vesicles?
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What is the structure of the penis?
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What is the function of corpora amylacea?
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What type of muscle is found in the prostate gland?
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What type of muscle surrounds the penile urethra?
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What is the function of the glands of Littre?
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How many types of mucous glands are found in the male urethra?
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What is the largest male accessory sex gland?
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What is the composition of the stroma in the prostate gland?
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What is the function of the trabeculae in the prostate gland?
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How many groups of acini are found in the prostate gland?
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What type of epithelium lines the prostatic acini?
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What type of epithelium is present in the epididymis?
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What is the function of the tunica albuginea?
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What is the structure that separates the two corpora cavernosa?
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What is the function of the corpus spongiosum?
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What type of epithelium is present in the vas deferens?
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What is the function of the prostate?
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Study Notes
Male Genital System
- The male genital system consists of the testes, epididymis, vas deferens, ejaculatory duct, urethra, prostate, seminal vesicles, and bulbourethral glands.
Intratesticular Ducts
- Intratesticular ducts include:
- Tubuli recti: straight tubules lined with Sertoli cells
- Rete testis: branched and anastomosed in the mediastinum testis, lined with cuboidal cells
Extratesticular Ducts
- Extratesticular ducts include:
- Vasa efferentia: 10-20 tubules gathered to form the head of the epididymis, lined with festooned epithelium (tall columnar ciliated cells alternating with low columnar secretory cells)
- Epididymis: formed of head, body, and tail, lined with pseudostratified columnar ciliated epithelium with stereocilia
- Vas deferens: lined with pseudostratified columnar ciliated epithelium with stereocilia
- Ejaculatory duct: formed by the fusion of the ampulla of the vas deferens and the duct of the seminal vesicle, lined with pseudostratified columnar epithelium
- Male urethra: 15-20 cm long, divided into prostatic, membranous, and penile urethra
Epididymis
- Epididymis:
- Length: 50 cm (intratesticular ducts), 6 meters (extratesticular ducts)
- Diameter: 200 µm (intratesticular ducts), 400 µm (extratesticular ducts)
- Lining: pseudostratified columnar ciliated epithelium with stereocilia
- Function: storage, maturation, and nutrition of sperm
Vas Deferens
- Vas deferens:
- Lining: pseudostratified columnar ciliated epithelium with stereocilia
- Musculosa: thick, with 3 layers of smooth muscle
- Adventitia: loose connective tissue
Ejaculatory Duct
- Ejaculatory duct:
- Length: 1 cm
- Formed by the fusion of the ampulla of the vas deferens and the duct of the seminal vesicle
- Opens in the prostatic urethra
- Lining: pseudostratified columnar epithelium
Male Urethra
- Male urethra:
- Prostatic urethra: 3-4 cm long, traverses the prostate
- Membranous urethra: 1-2 cm long, intermediate part
- Penile urethra: 12-14 cm long, in the corpus spongiosum of the penis
- Lining: transitional epithelium (prostatic urethra), stratified columnar epithelium (membranous and penile urethra)
Male Accessory Sex Glands
- Male accessory sex glands:
- Prostate: largest male accessory gland, surrounds the bladder neck, traversed by the prostatic urethra
- Seminal vesicles: 2 highly tortuous tubes, 15 cm long, formed of mucosa, musculosa, and adventitia
- Bulbourethral (Cowper’s) glands: 3-5 mm in diameter, empty into the membranous urethra
Prostate
- Prostate:
- Histology: stroma (capsule, trabeculae, reticular stroma) and parenchyma (tubuloalveolar acini)
- Function: secretes a thin, milky fluid
- Prostatic acini: lined with columnar, cuboidal, or pseudostratified columnar epithelium
Seminal Vesicles
- Seminal vesicles:
- Function: provides 70% of seminal fluid, adds sperm-activating substances (fructose, citrate, proteins, PGs)
Bulbourethral Glands
- Bulbourethral glands:
- Function: secretes clear mucus for lubrication
- Histology: stroma (thin C.T capsule, septa containing skeletal and smooth muscles) and parenchyma (tubuloalveolar glands)
Penis
- Penis:
- Covered with skin, no subcutaneous fat, hairs only at the root
- Formed of erectile tissue: 2 corpora cavernosa and 1 corpus spongiosum
- Each corpus is formed of blood spaces separated by C.T + smooth muscle + elastic fibers
- Tunica albuginea + fascia penis then skin
- 2 Corpora cavernosa are separated by an incomplete septum
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Description
This quiz covers the anatomy and histology of the male genital system, including the structure and function of the seminiferous tubules, Sertoli cells, and blood testis barrier, as well as the stages of spermatogenesis and spermiogenesis.
