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The bulbus glandis (also called a bulb or knot) is an erectile tissue structure on the penis of canid mammals. [1][2][3][4][5][6] During mating, immediately before ejaculation the tissues swell up to lock (tie) the male's penis inside the female. The locking is completed by circular muscles just inside the female's vagina; this is called "the ...
A dog's glans consists of two sections: Behind the lower, long part (pars longa glandis) lies the "knot" (Bulbus glandis) [1] which expands only after penetrating the vagina and causes the male dog to remain inside the bitch ("Tie") for some time after ejaculation (typically between 15 and 30 min).
Male felids are able to urinate backwards by curving the tip of the glans penis backward. [55] [56] In cats, the glans penis is covered with spines. Penile spines also occur on the glans of male and female spotted hyenas. [55] In male dogs the glans penis is smooth and consists of two parts called the bulbus glandis and pars longa glandis. [57]
The bulbourethral glands are compound tubulo-alveolar glands, each approximately the size of a pea in humans. In chimpanzees, they are not visible during dissection, but can be found on microscopic examination. [7] In boars, they are up to 18 cm long and 5 cm in diameter. [6] They are composed of several lobules held together by a fibrous covering.
Penile spines. Penile spines of a domestic cat. Many mammalian species have developed keratinized penile spines along the glans and/or shaft, which may be involved in sexual selection. These spines have been described as being simple, single-pointed structures (macaques) or complex with two or three points per spine (strepsirrhines). [1]
The bulb of penis is the proximal/posterior bulged [1] end of the (unpaired median) corpus spongiosum penis. Together with the two crura (one crus on each side of the bulb), it constitutes the root of the penis. [2] It is covered by the bulbospongiosus. Proximally/posteriorly, the bulb of penis extends towards the perineal body.