Dolphins have always aroused genuine interest in humans with their behavior and structural features. Scientists carefully study all parts of the body of this animal, including the genitals of dolphins. Currently, this topic has been studied in sufficient detail and is well covered in the relevant literature.
The genital organs of dolphins: structural features of the female
Dolphin females have a single urogenital fold, which extends parallel to the belly. It also has an anal exit. In the front part, through the dense fibrous connective tissue, the clitoris emerges, which is well developed. He has a cavernous body and a thick white membrane.
Behind it there is an outlet for urination, a little further in front of the anus is a narrow genital fissure. The external genitalia of the female dolphin is the large and small labia.
Immediately after the genital opening, the diameter of the vagina expands as much as possible. Near the entrance there are several longitudinal folds, which gradually decrease towards the middle of the penis.
In the middle, the longitudinal folds disappear, and through a small segment, folds of the transverse shape, which are called circular, are found.
Bottlenose dolphins have 2 to 4 large circular folds located at the top of the vagina. Next to the cervix is a two-three-centimeter fold called the pseudo-cervix, with a narrowed opening resembling a real cervix.
With its back wall, together with the front wall of the real cervix, it forms a chamber where sperm is taken. In this chamber, the bottlenose dolphin contains from 6 to 10 milliliters of sperm.
Such a death receiver is morphologically adapted so that animals can successfully reproduce in a marine environment. In case of mating, the male introduces his organ into this chamber. After it is removed, the pseudo-neck contracts muscles, sea water does not enter the spermotaziodes, otherwise they would die. The female dolphin does not have a hymen .
Sexual characteristics of males
The genitals of male dolphins are distinguished by the presence of a crotch that separates the anal outlet and the genital fold.
The dolphin has no scrotum, the location of the testes is the abdominal cavity. At a dolphin's body temperature of 37 degrees Celsius, spermatogenesis proceeds normally; the critical temperature for this process is 38 degrees.
To prevent the heating of the testes from the work of the strong muscles of the tail, nature created an inguinal countercurrent heat exchange system, called the inguinal plexus.
Venous blood has the ability to cool during circulation through the dorsal and caudal fins, after which it enters the venous inguinal plexus. There, the chilled blood passes through the venous vessels located next to the arteries in the inguinal plexus. Thus, the blood entering the testes is somewhat cooled due to heat exchange processes in which cooled venous and warm arterial blood is involved.
The structure of the testes
The shape of the testes in the dolphin is elongated, almost cylindrical. On top of the testes is surrounded by a smooth protein shell, which is bonded with fibrous.
The testis has a typical lobed structure, but it has a lot of shares, much more than other types of animals. The male bottlenose dolphin has testes measuring 29 by 9 centimeters, weighing about 600 grams, and seminiferous tubules with a diameter of 200 microns.
Maturation of various sites of the testes of the male dolphin occurs at different times.
What is the dolphin's genital size?
When the dolphin is at rest, its penis in the form of a loop is hidden in a special fold. It is supported by the muscles that pull the penis and push it out in case of excitement.
In the process of erection, the genital organs of dolphins are excited due to the fibroelastic structure of the penis, relaxed retracting muscles and swelling due to a rush of blood. The member is thus half immersed in the crease of the prepuce. It has a slight bend in the form of the English letter S and a thick protein shell.
In an excited state, the size of the genital organ of the dolphin varies slightly. The diameter of the penis is about 8 and a half centimeters, its length is from 25 to 33 centimeters.