the pelvis is a complex piece of anatomy so let's begin by taking a moment to get our bearings the perineum lies at the bottom of the pelvis it is the space between the thighs encompassing anus and genitals space the corners of the diamond are the coccyx pubic symphysis and to ischial tuberosities the ceiling of the space is the pelvic floor muscles you the pelvic floor muscles or liver tore ni a shapes like a bowl so the ceiling of the space is partly convex the sto pubic Remo the sacred humerus ligament which are the boundaries of the pelvic outlet the diamonds anterior half is known as the urogenital triangle the posterior half the anal triangle in a standing position the urogenital triangle roughly conforms to the horizontal plane the anal triangle is on an upward tilt around 30 degrees from horizontal to bring some perspective here's the femur a rough approximation of the coronal plane returning now to an inferior view the year triangle contains a fibrous sheet called the perineal membrane oriented like so you the perineal membrane has upturned anterior and posterior edges and collects within it a space known as the deep peroneal pouch the sto anal fussy partially occupy the space between this pouch and the pelvic floor muscles the deep peroneal pouch is thus a very shallow space all of this in blue is your anal Fosse and the space contained by and just deep to the perineal membrane colored in purple that's the deep peroneal pouch it contains within it a number of muscles including the external urethral sphincter in the female sex the pouch includes two holes for vagina and urethra these are allowed passage through the lavatory no muscles in this u-shaped space known as the urogenital hiatus just deep to the skin is a membranous layer of superficial fascia known as collies fascia in between the perennial membrane and the relevant part of colleagues fascia lies the superficial peroneal pouch this pouch contains the bolbo spongy osis is he okay venosus and super visual transverse peroneal muscles it also contains various erectile tissue of the penis and clitoris plus the continuation of the urethra and vagina so that's the superficial and deep peroneal patches the perineal membrane has a free posterior border in the center of this posterior border and of the diamond-shaped perineum at large lies the perineal body fibromuscular meeting point for many structures of the perineum many of the muscles we've mentioned so far converge here posterior and superior to that is the anal sphincter muscles the centerpiece of the anal triangle you let's go back and review the most important points now the perineum is a 3d space with the pelvic floor muscles as its ceiling [Music] the space is divided into the urogenital triangle anteriorly and anal triangle posteriorly there are two perennial patches superficial and deep both in the urogenital triangle and separated by the perineal membrane that's it for now it's subscribe if you like this video thanks for watching and we will see you next time [Music]