Victor Forge
The male reproductive system includes the penis, testicles, scrotum, and internal organs. The scrotum protects the testicles and regulates their temperature, which is necessary for normal sperm development. The testicles produce sperm, which are then stored in the epididymis, a coiled tube that rests on the back of each testicle. During ejaculation, rhythmic muscle contractions propel the sperm forward through the deferent duct and into the urethra. These muscles include the bulbocavernosus muscle, the external urethral sphincter, and the bulbospongiosus muscle.
| Characteristics | Values |
|---|---|
| Function | To act as a pump that forcefully propels sperm out of the body during ejaculation |
| Location | Wall of the scrotum, urethra, perineal membrane, and dorsum of the penis |
| Type | Smooth muscle cells, striated muscles |
| Rhythm | Rhythmic contractions |
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What You'll Learn
- Scrotum muscles contract and relax to control testicle temperature for sperm production
- Rhythmic contractions of the epididymal tubule's smooth muscles help sperm mature
- The vas deferens is a muscular tube that transports mature sperm to the urethra
- The bulbocavernosus muscle's contractions expel semen from the body during ejaculation
- External urethral sphincter contractions during ejaculation allow sperm to pass through the urethra
Scrotum muscles contract and relax to control testicle temperature for sperm production
The scrotum is a sac of skin and muscle that contains the testes in mammals. It is a unique feature of mammals, serving as a protective "climate-control system" for the testicles. The scrotum's function is to maintain the temperature of the testes at a slightly lower temperature than the rest of the body. This is achieved through the contraction and relaxation of the cremaster muscle and the dartos fascia in the scrotum, which move the testes closer to or further from the body to regulate their temperature.
The optimal temperature for normal sperm development is between 97 and 99 degrees Fahrenheit or 36 and 37 degrees Celsius, which is slightly cooler than body temperature. When the body is warm, the scrotum relaxes and moves away from the body to cool the testes. Conversely, when it is cold, the scrotum contracts and moves the testes closer to the body for warmth and protection. This temperature regulation is essential as higher temperatures can be detrimental to sperm count and quality.
In addition to the scrotum's role in temperature regulation, the epididymis, a long coiled tube attached to each testicle, also plays a part in sperm maturation and storage. The epididymis provides an environment for sperm to mature and acquire the necessary motility and fertility. The cauda epididymis, in particular, resides in the coolest location within the scrotum, contributing to the optimal storage conditions for sperm.
During sexual arousal, muscle contractions occur that force the mature sperm into the vas deferens, a long muscular tube that transports sperm to the urethra in preparation for ejaculation. The vas deferens joins with the seminal vesicles and prostate gland to form the ejaculatory ducts, adding fluid to create semen. At the time of ejaculation, rhythmic contractions in the external urethral sphincter and the bulbospongiosus muscle facilitate the expulsion of semen and sperm from the body.
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Rhythmic contractions of the epididymal tubule's smooth muscles help sperm mature
The male reproductive system consists of external and internal organs, including the penis, testicles, scrotum, and prostate. The scrotum, a sac of skin outside the pelvis, holds and protects the testicles. It also provides a "climate-control system" for the testicles, keeping them at a temperature slightly cooler than body temperature, which is essential for normal sperm development.
The epididymis is a long, coiled tube that rests on the back of each testicle. It is responsible for carrying, storing, and bringing sperm to maturity. The sperm that emerges from the testicles are immature and incapable of fertilization. The epididymis is divided into three segments: the caput, which is proximal to the testis, the corpus, and the cauda.
Rhythmic contractions of the epididymal tubules' smooth muscles help sperm mature and migrate from the testicular efferent ducts to the ductus deferens (vas deferens). The ductus epididymis, formed by the encapsulation of the epididymal tubule within the tunica vaginalis, exhibits spontaneous and neural stimulation-induced rhythmic contractions. The innervation of the epididymis is primarily provided by the inferior spermatic nerve, which carries sympathetic fibers. The functions of the epididymis include allowing spermatozoa migration and sustaining the biological process of spermatozoa acquiring motility and fertility maturity.
During sexual arousal, muscle contractions force the mature sperm into the vas deferens, a long muscular tube that transports sperm to the urethra in preparation for ejaculation. The vas deferens begins in the scrotum and travels into the body, joining with the duct of the seminal vesicle to form the ejaculatory duct. The seminal vesicles and the prostate gland produce a whitish fluid called seminal fluid, which mixes with sperm to form semen. During ejaculation, rhythmic muscle movements, including contractions of the external urethral sphincter and the bulbospongiosus muscle, propel the semen through the urethra and out of the body.
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The vas deferens is a muscular tube that transports mature sperm to the urethra
The male reproductive system is responsible for sexual function and urination. It includes the penis, testicles, scrotum, and internal organs. The scrotum, a bag of skin outside the pelvis, holds the testicles and provides a "climate-control system" for normal sperm development. The testicles produce sperm and testosterone. The epididymis, a long, coiled tube that rests on the back of each testicle, carries, stores, and brings the sperm to maturity.
During ejaculation, muscles around the reproductive organs tighten, forcing the semen through the duct system and urethra. The external urethral sphincter exhibits intense rhythmic contractions, allowing sperm passage to the urethral meatus. The major function of the BS muscle is to act as a pump that forcefully propels sperm out of the body during ejaculation.
The vas deferens is a vital part of the male reproductive system, and damage to it can cause infertility. It is also important to note that the only vertebrates that lack a vas deferens are primitive jawless fishes, which release sperm directly into the body cavity and then into the surrounding water.
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The bulbocavernosus muscle's contractions expel semen from the body during ejaculation
The male reproductive system includes the penis, testicles, scrotum, and internal organs. The scrotum, a bag of skin outside the pelvis, holds the testicles and provides a "climate-control system" for normal sperm development. The testicles produce sperm, which are then stored in the epididymis. During sexual arousal, muscle contractions force the sperm into the vas deferens, a long, muscular tube that transports mature sperm to the urethra in preparation for ejaculation.
The bulbocavernosus muscles play a crucial role in expelling semen from the body during ejaculation. Also known as the BS muscle, it arises from the central point of the perineum and envelopes the corpus cavernosum. It encircles the corpora cavernosa and corpus spongiosum, attaching to the perineal membrane and dorsum of the penis.
During the expulsion phase of ejaculation, the BS muscle contracts rhythmically and intensely, acting as a pump that forcefully propels semen out of the body. This contraction is concomitant with the orgasmic feeling accompanying ejaculation. The somatic motor system contributes to the innervation of perineal striated muscles through motoneuron axons conveyed by the pudendal nerves.
The entire process of ejaculation is a reflex reaction that cannot be voluntarily interrupted once started. It involves the expulsion of semen from the urethra, with strong spasmodic contractions of the bulbocavernosus muscle, which encircles the corpus spongiosum. The corpus spongiosum is the structure in the penis that encloses the urethra.
In summary, the bulbocavernosus muscles are responsible for the rhythmic and intense contractions that forcefully expel semen from the body during the expulsion phase of ejaculation. This process is closely associated with the pleasurable sensations of orgasm and is controlled by the somatic motor system and pudendal nerves.
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External urethral sphincter contractions during ejaculation allow sperm to pass through the urethra
The urethra is a tube that carries sperm (in semen) to the outside of the body through the penis. During ejaculation, semen and urine share the urethra as a passageway. The urethral sphincters are two muscles that control the exit of urine from the bladder through the urethra. The two muscles are the external urethral sphincter and the internal urethral sphincter.
The internal urethral sphincter controls involuntary urine flow from the bladder to the urethra, while the external urethral sphincter controls voluntary urine flow. The internal sphincter is made of smooth muscle and is under involuntary or autonomic control. The external sphincter is composed of skeletal muscle fibres and is under somatic motor control from the perineal branches of the pudendal nerve. When these muscles contract, the urethra narrows, and urination stops or slows.
During ejaculation, the external urethral sphincter contracts rhythmically and intensely, allowing sperm to pass through the urethra. The external urethral sphincter is also responsible for preventing retrograde ejaculation of semen into the bladder. Sympathetic stimulation during orgasm causes the internal urethral sphincter to contract at the neck of the urinary bladder, preventing semen from travelling proximally through the internal urethral orifice and into the bladder.
The bulbospongiosus muscle also plays a role in forcefully propelling sperm out of the body through the urethra during ejaculation. The muscle surrounds the corpus cavernosum and corpus spongiosum and attaches to the perineal membrane and the dorsum of the penis.
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Frequently asked questions
The scrotum is a sac of skin outside the pelvis that holds and protects the testicles. It also helps keep the testicles at the right temperature for sperm production. The scrotum contracts and relaxes to move the testicles closer to or away from the body to regulate their temperature.
The epididymis is a long, coiled tube that rests on the back of each testicle. It receives immature sperm from the testicles and stores them for several days. The epididymis also brings the sperm to maturity. During ejaculation, rhythmic muscle contractions propel the sperm forward from the epididymis into the deferent duct.
The bulbospongiosus muscle acts as a pump that forcefully propels sperm out of the body during the expulsion phase of ejaculation. Rhythmic intense contractions of the bulbospongiosus muscle are associated with the orgasmic feeling accompanying ejaculation.
