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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] ...
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).
In male dogs the glans penis is smooth and consists of two parts called the bulbus glandis and pars longa glandis. [56] The glans of a fossa's penis extends about halfway down the shaft and is spiny except at the tip. In comparison, the glans of felids is short and spiny, while that of viverrids is smooth and long. [57]
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]
They vary in size from the fennec fox, which may be as little as 24 cm (9.4 in) in length and weigh 0.6 kg (1.3 lb), [20] to the gray wolf, which may be up to 160 cm (63 in) long, and can weigh up to 79 kg (174 lb). [21] Only a few species are arboreal—the gray fox, the closely related island fox [22] and the raccoon dog habitually climb trees.
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]
In contrast to chimpanzees, a common morphological variant found in humans called hirsuties coronae glandis, or pearly penile papules, are substantially larger, appear to be an outpocketing of both surface and underlying connective tissue layers, and lack the rich innervation seen in other animals.
The exterior structure of the glans consists of mucous membrane, which is usually covered by foreskin or clitoral hood in naturally developed genitalia.This covering, called the prepuce, is normally retractable in adulthood unless removed by circumcision.