Anatomy of the prostate.

Anatomy of the prostate.Anatomical features of the prostate. Functions of the prostate. Blood supply and innervation of the prostate.
~ 4 min

In this note we will consider the structure of the prostate (prostate).

Prostate (prostata)
Prostate (prostata)
Prostate (prostata)
Prostate (prostata)
Prostate (prostata)
Prostate (prostata)

It belongs to the so-called accessory reproductive glands of the male reproductive system.

The prostate produces a secretion that stimulates the motility of the sperm cells and allows the sperm to remain in a liquid state. This is necessary for the successful fertilization of the oocyte. This gland also acts as an involuntary sphincter of the urethra, making urination impossible during ejaculation.

The prostate is located in the pelvic cavity and resembles a chestnut in its shape.
The urethra (urethra) and ejaculatory ducts (ductus ejaculatorius) pass through the organ.

Urethra (urethra)
Urethra (urethra)
Urethra (urethra)
Urethra (urethra)
Ejaculatory duct (ductus ejaculatorius)
Ejaculatory duct (ductus ejaculatorius)
Ejaculatory duct (ductus ejaculatorius)
Ejaculatory duct (ductus ejaculatorius)

Each such duct is formed by the fusion of the ductus deferens (ductus deferens)

Ductus deferens (ductus deferens)
Ductus deferens (ductus deferens)

and the excretory duct (ductus excretorius).

Excretory duct (ductus excretorius)
Excretory duct (ductus excretorius)

The prostate has the following parts:

1. The base (basis prostatae), which adheres to the urinary bladder

Base (basis prostatae)
Base (basis prostatae)
Base (basis prostatae)
Base (basis prostatae)

2. The apex (apex prostatae), which goes inferiorly to the urogenital diaphragm

Apex (apex prostatae)
Apex (apex prostatae)
Apex (apex prostatae)
Apex (apex prostatae)

3. The anterior surface (facies anterior), which is located behind the pubic symphysis and is separated from it by loose fiber

Anterior surface (facies anterior)
Anterior surface (facies anterior)

4. The posterior surface (facies posterior) of the prostate gland, on which the seminal vesicles and ampullae of the ductus deferentes are located. It adheres to the wall of the rectum.

Posterior surface
(facies posterior)
Posterior surface<br />
 (facies posterior)

There is a small depression on the anterior surface of the prostate, which divides the gland into the right lobe (lobus dexter) and the left lobe (lobus sinister).

Right lobe (lobus dexter)
Right lobe (lobus dexter)
Left lobe (lobus sinister)
Left lobe (lobus sinister)

There is an isthmus of the prostate gland (isthmus prostatae) between the ejaculatory ducts posteriorly and the urethra anteriorly.

Isthmus of the prostate gland (isthmus prostatae)
Isthmus of the prostate gland (isthmus prostatae)

With inflammation of the gland, as well as other pathologies, the isthmus can increase in volume and narrow the urethra, which leads to pain and discomfort during urination. It is also called the middle lobe of the prostate (lobus medius prostatae).

Middle lobe of the prostate (lobus medius prostatae)
Middle lobe of the prostate (lobus medius prostatae)
Middle lobe of the prostate (lobus medius prostatae)
Middle lobe of the prostate (lobus medius prostatae)

On the internal surface of the isthmus, from the side of the urethra, there is the seminal colliculus (colliculus seminalis).

Seminal colliculus (colliculus seminalis)
Seminal colliculus (colliculus seminalis)
Seminal colliculus (colliculus seminalis)
Seminal colliculus (colliculus seminalis)

At its top there is a narrow slit, no more than 1 mm deep. It ends blindly on the surface of the prostate and is called the prostatic utricle (utriculus prostaticus).

Prostatic utricle (utriculus prostaticus)
Prostatic utricle (utriculus prostaticus)

On the flanks of the utricle are the openings of the left and right ejaculatory ducts, and next to the seminal colliculus there are prostatic ducts (ductuli prostatici).

Prostatic ducts (ductuli prostatici)
Prostatic ducts (ductuli prostatici)

Externally, the prostate is covered with a capsule (capsula prostatica).

Capsule (capsula prostatica)
Capsule (capsula prostatica)

Septa separating the prostate into cells extend inside from this capsule. These cells have different shapes and sizes. Each cell contains from 20 to 50 glands, as well as muscle fibers. Thus, there are the glandular parenchyma (parenchyma) and the muscular substance (substantia muscularis) in the prostate gland.

Muscular substance (substantia muscularis)
Muscular substance (substantia muscularis)

Prostatic glands have a tubuloalveolar structure, their excretory ducts (ductuli prostatici) open into the prostatic urethra on the flanks of the seminal colliculus.

Excretory ducts (ductuli prostatici)
Excretory ducts (ductuli prostatici)

Blood supply

Arterial blood enters the prostate through the pudendal, inferior vesical and middle rectal arteries from the system of the internal iliac artery.

Venous drainage

The venous blood drains into the prostatic venous plexus, from which it drains into the internal iliac veins.

Lymph drainage

The lymph drains into the lymph nodes of the anterior parts of the pelvic cavity.

Innervation

The prostate is innervated by the nerves from the inferior hypogastric plexus.

Dictionary

Structure of the prostate

Prostate
prostatа
Base of the prostate
basis prostatae
Apex of the prostate
apex prostatae
Anterior surface
facies anterior
Posterior surface
facies posterior
Right lobe
lobus dexter
Left lobe
lobus sinister
Isthmus of the prostate
isthmus prostatae
Middle lobe of the prostate
lobus medius prostatae
Seminal colliculus
colliculus seminalis
Utricle of the prostate
utriculus prostaticus
Prostatic ducts
ductuli prostatici
Capsule of the prostate
capsula prostatica
Glandular parenchyma
parenchyma glandularae
Muscular substance
substantia muscularis
Prostatic ducts
ductuli prostatici
Median rectal arteries
aa. rectales mediae
Inferior vesical arteries
aa. vesicales inferior
Prostatic nervous plexus
plexus venosus prostaticus
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