The bulb of penis is the proximal/posterior bulged end of the (unpaired median)
corpus spongiosum penis
The corpus spongiosum is the mass of spongy tissue surrounding the male urethra within the penis. It is also called the corpus cavernosum urethrae in older texts.
Structure
The proximal part of the corpus spongiosum is expanded to form the ...
. Together with the two
crura (one crus on each side of the bulb), it constitutes the
root of the penis
In human male anatomy, the radix () or root of the penis is the internal and most proximal portion of the human penis that lies in the perineum. Unlike the pendulous body of the penis, which is suspended from the pubic symphysis, the root is attac ...
.
It is covered by the
bulbospongiosus
The bulbospongiosus muscles (in older texts bulbocavernosus and, for female muscle, constrictor cunni) are a subgroup of the superficial muscles of the perineum. They have a slightly different origin, insertion and function in males and females. ...
.
Proximally/posteriorly, the bulb of penis extends towards the
perineal body
The perineum (: perineums or perinea) in placental mammals is the space between the anus and the genitals. The human perineum is between the anus and scrotum in the male or between the anus and vulva in the female. The perineum is the regio ...
. The bulb exhibits a slight yet palpable midline notch upon its inferior aspect.
The male urethra enters the penis at the superior aspect of the anterior part of the bulb (most of the bulb is thus situated inferoposteriorly to the urethra), and the
arteries of bulb of penis enter near the urethra.
The bulb of penis is
homologous to the
vestibular bulbs
In female anatomy, the vestibular bulbs, bulbs of the vestibule or clitoral bulbs are two elongated masses of erectile tissue typically described as being situated on either side of the vaginal opening. They are united to each other in front by a ...
in females.
Additional images
File:Gray1142.png, Male urethra.
File:Gray1158.png, Diagram of the arteries of the penis.
References
External links
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Mammal male reproductive system
Human penis anatomy
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