Questions and Answers
What is the function of the Tunica Dartos Muscle?
What is the Stratum Subdarticum?
A loosely woven layer of connective tissue between the tunica dartos and tunica vaginalis parietal.
What does the Tunica Vaginalis Parietal Layer do?
It is a slick layer that the testis descends through.
What does the Tunica Albuginea provide to the testis?
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What is produced in the Seminiferous Tubules?
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Leydig Cells produce estrogen.
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What is the role of the Efferent Ducts?
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The ________ connects the tail of the epididymis to the ampulla.
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What is the purpose of the Pampiniform Plexus?
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What is the main function of the Bulbocavernosus Muscle?
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What is the location of the Glans Penis?
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What does the Epididymis connect?
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The ________ contains the testicular artery and vein.
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What is the role of the Seminal Vesicles?
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The penile urethra is located in the pelvic region.
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What characterizes the Sigmoid Flexure?
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Study Notes
Tunica Dartos Muscle
- Smooth muscle located beneath the scrotal skin.
- Regulates scrotal temperature through contractions.
- Contracts to hold the testis close during cold temperatures.
- Expands the surface area of the scrotum in heat to enhance cooling via evaporation.
- Characterized by a pink/red color and intertwined with Stratum Subdarticum.
- Functions as an accordion-like scrunching mechanism for surface area adjustment.
Stratum Subdarticum
- Loosely woven layer of white connective tissue found between tunica dartos and tunica vaginalis parietal.
- Contains striated muscle tissue and operates in fight or flight responses.
Tunica Vaginalis Parietal Layer
- A slick layer akin to the broad ligament in females.
- Facilitates the descent of the testis during development.
Tunica Vaginalis Visceral Layer
- Slick outer lining of the testis, providing a gliding surface.
- Directly contacts the tunica albuginea.
Sweat Glands
- Function in evaporative cooling to help regulate temperature.
Testis
- Male gonads responsible for sperm production and hormone secretion.
Testicular Artery
- Main arterial supply to the testis, crucial for adequate blood flow and oxygenation.
Tunica Albuginea
- Dense connective tissue capsule surrounding the testis and other organs.
- Provides structural integrity to the testis.
Seminiferous Tubules
- Site of spermatogenesis, producing spermatozoa.
- Located within the tunica albuginea.
Leydig Cells
- Located in the interstitial tissue of the testis.
- Possess LH receptors and are responsible for testosterone production.
Rete Testis
- Central component of the testis consisting of a network of tubules.
- Functions as a supportive "elevator" for sperm transport.
Efferent Ducts
- Connects the rete testis to the head of the epididymis.
- Concentrates sperm for maturation.
Mediastinum
- Connective tissue core of the testis housing the rete testis.
- Not present in stallions; varies in orientation across species.
Tubuli Seminiferi Recti
- Connects convoluted seminiferous tubules to the rete testis.
Epididymis
- Structure connecting the efferent ducts to the ductus deferens.
- Functions in the transport, storage, and maturation of spermatozoa.
Caput, Corpus, and Cauda
- Caput: Head of the epididymis; site of initial sperm development.
- Corpus: Body of the epididymis; involved in sperm capacitation.
- Cauda: Tail of the epididymis; primary storage area for mature sperm.
Spermatic Cord
- Structure contains testicular artery and vein, nerves, lymphatics, ductus deferens, and cremaster muscle.
Pampiniform Plexus
- Network of veins surrounding the testicular arteries; functions in thermoregulation.
Vas Deferens
- Muscular tube transporting sperm from the epididymis to the pelvic urethra.
External Cremaster Muscle
- Muscle that retracts the testis towards the body for temperature regulation.
Ampulla
- Enlargement of the vas deferens prior to connecting to the pelvic urethra; absent in boars.
Accessory Glands
- Surround pelvic urethra and produce seminal plasma, enhancing sperm transport.
Seminal Vesicles and Prostate Gland
- Seminal Vesicles: Produce different fluids depending on species; important for semen composition.
- Prostate Gland: Provides muscular support and additional fluids.
Cowpers (Bulbourethral) Gland
- Contributes gel-like fractions to semen; plays a role in pre-ejaculate fluid production.
Pelvic Urethra
- Extends from the base of the penis, surrounded by urethralis muscle.
Colliculus Seminalis
- Collects semen and mixes it with seminal fluids before ejaculation.
Urethralis Muscle
- Contracts to facilitate the movement of semen during ejaculation.
Ischiocavernosus and Bulbocavernosus Muscles
- Ischiocavernosus: Paired muscles aiding in ejaculation.
- Bulbocavernosus: Contracts to push semen through the bulb of the urethra.
Crura
- The beginning of the penile shaft, consists of the paired structures at the base of the penis.
Bulb of Urethra
- Storage area for semen right before ejaculation.
Penis
- Primary male sex organ, essential for reproduction.
Penile Urethra
- Segment of the urethra that runs within the penis.
Sigmoid Flexure
- S-shaped curve of the flaccid penis that straightens when erect.
Retractor Penis Muscle
- Smooth muscle that enables full penile protrusion and erection.
Corpus Cavernosum
- Tissue layers in the penis, critical for erection.
Glans Penis
- Highly sensitive distal end of the penis, crucial for sexual arousal.
Layers of Testis
- Comprises various tissue layers including tunica vaginalis (both parietal and visceral) and tunica albuginea, providing structure and protection.
Stereocilia
- Present in the male reproductive tract, believed to assist in absorption within the epididymis and ductus deferens.
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Explore the key concepts of male anatomy with these flashcards. This quiz focuses on the Tunica Dartos muscle, detailing its functions and adaptations to temperature. Perfect for students or anyone interested in understanding male reproductive anatomy.
