What Are the Different Parts of the Male Reproductive System?

The male reproductive system consists of two parts, the internal and external genitalia. The internal genitalia is composed of the gonads (testicles), the insemination ducts (epididymis, vas deferens, ejaculation ducts, and urethra) and the accessory glands (spermaceous glands, prostate, urethral bulb). The external genitalia include the scrotum and penis.

The male reproductive system consists of two parts, the internal and external genitalia. The internal genitalia is composed of the gonads (testicles), the insemination ducts (epididymis, vas deferens, ejaculation ducts, and urethra) and the accessory glands (spermaceous glands, prostate, urethral bulb). The external genitalia include the scrotum and penis.

Chinese name

Male reproductive system

Foreign name

male genital system

Make up

Internal and external genitalia

Features

Production of sperm and secretion of androgens

Male reproductive system

(A) gonads:

The testes are located in the scrotum, one on each side. Oblate ellipsoid, divided into upper and lower ends, inside and outside, front and back edges. The surface is covered with dense connective tissue called white membrane. At the posterior edge of the testis, the white membrane thickens and protrudes into the parenchyma of the testis to form a radial septum, which divides the testis into many cone-shaped testicular leaflets, each containing 2-3 seminiferous seminiferous tubules. There are interstitial cells in the connective tissue between the seminiferous tubules, which secrete male hormones. The seminiferous tubules merged into straight seminiferous tubules at the tip of the testicular leaflets and then intertwined with each other to form a net. Finally, more than ten output tubules were sent into the epididymis at the posterior edge of the testis.

(II) Insemination pipeline:

Epididymis:

The epididymis is close to the upper and trailing edges of the testicles and can be divided into three parts: head, body, and tail. The head consists of an output tube, and the end of the output tube is connected to an epididymal tube. The epididymal tube is about 4-5 meters long and constitutes the body and tail. Function: Provide nutrition for sperm growth and maturation: epididymal wall epithelial secretions-certain hormones, enzymes, specific substances-provide nutrition for sperm growth; storage of sperm: sperm is stored here, mature and has vitality.

2. Vas deferens:

The vas deferens is about 40 cm long and is in the shape of a tight round cable. The vas deferens travels long, from the scrotum to the outer subcutaneous, and then into the abdominal cavity and pelvis through the inguinal canal. Inside the seminal vesicle gland behind the bottom of the bladder, it expands to form the ampulla of the vas deferens, which ends thinner and synthesizes with the excretory duct of the seminal vesicle. .

3. Ejaculatory tube:

The ejaculation tube is about 2 cm in length, penetrates the parenchyma of the collateral gland, and opens in the urethral prostate.

(Three) accessory glands:

1. seminal vesicle gland:

A flat oval sac-like organ, located behind the base of the bladder, outside the ampulla of the vas deferens, the excretory tube and the end of the vas deferens form an ejaculation tube.

2. Prostate:

It is chestnut-shaped, located between the bottom of the bladder and the urogenital ridge, divided into the bottom, body, and tip. There is a longitudinal superficial sulcus behind the body for the prostate sulcus, and there is a urethra through it. Function: secretes a milky alkaline liquid containing more oxalate and acid phosphatase, called prostate fluid. Its role is to neutralize the acidic fluid that sperm encounters after ejaculation, thereby ensuring sperm motility and fertility. Prostate fluid is an important component of seminal plasma, accounting for about 20% of seminal plasma. The prostate can also secrete hormones called prostaglandins, which have the functions of transporting sperm, eggs and affecting uterine movements.

2. Urethral bulb:

It is buried in the urogenital ridge, pea-shaped, and opens at the beginning of the urethral sponge. Function: secretes egg white-like alkaline liquid, excretes into the urethral bulb, and participates in semen composition.

Male reproductive system II, external genitalia:

1. Scrotum:

It is a sac made of skin. The subcutaneous tissue contains a large number of smooth muscle fibers, called the flesh membrane, which forms a scrotal septum on the median line to separate the testicles from the epididymis on both sides. Its skin is a flesh film composed of smooth muscle and connective tissue, which contracts and relaxes to regulate the temperature in the capsule. The temperature below the scrotum is important for sperm development and survival. Sperm cells are sensitive to temperature, so when the body temperature rises, the scrotum relaxes, which is convenient for reducing the temperature of the scrotal bone; when the body temperature decreases, the scrotum contracts to save the temperature in the scrotum.

2. Penis:

It can be divided into three parts, the penis head, the penis body, and the penis root. There is a circular coronal groove between the head and body. The head of the penis is an enlarged part of the front end of the penis. The tip of the penis has an external urethral opening. The thinner part behind the head is called the penis neck. The penis consists of two corpora cavernosa and one urethral sponge, and the outer bread is composed of fascia and skin. The urethral cavernous body has a urethra throughout its entire length, the front end is enlarged, that is, the penis head, and the rear end is enlarged to form a urethral bulb. The outer bread of each sponge body is covered with a layer of fibrous membrane. Inside the sponge body there are trabeculae composed of connective tissue and smooth muscles. The space between the trabeculae is called the cavernous cavity. Large, the penis is erect. The cavernous body has muscles attached to it, which assist in urination, penile erection, and ejaculation. The skin of the penis is thin and easily stretched, making it suitable for penile erections. The penis body to the neck skin is free to move forward to form a circular fold around the head of the penis called the penis foreskin.