Pelvis & Perineum
Last Modified: 2012-03-10
1. Pelvic cavity is wider, shallower
2. Wider subpubicangle
3. Larger pelvic inlet and outlet
4. Shorter and wider sacrum
5. Circular/oval shape of pelvis inlet
- Pudendal n.
- n. to obturator internus
- Internal Pudendal a./v.
- Tendon of the obturator internus
6. Blood vessels, lymphatics,and nerves
bodies and rami of the pubic bone, pubic symphysis
bones: sacrum and coccyx;
ligaments: sacrospinousand sacrotuberous
bones: hip bone
muscle: obturatormembrane, obturatorinternus muscle coveredby obturatorfascia
***In malesScarpa'sfascia ofthe abdomen continues into perineum —› Darto'sfascia ofthe penis
and Darto’sfascia of the scrotum (contains Dartos'smooth muscle)
1. Bulb and crura ofpenis covered by the ischiocavernosus and bulbospongiosus m.
2. Proximal part of spongyurethra
3. Superficial transverse perinealm.
4. Deep perinealbranches of the internal pudendalvessels and pudendaln.
3. Greater vestibular glands (Bartholin’sglands)
4. Superficial transverse perineal m.
5. Deep perinealbranches of the internal pudendalvessels and pudendaln.
Anterior: superficial and deep transverse perineal m.
Posterior: gluteus maximus and sacrotuberous lig.
Medial: sphincter ani externus & levator anim.
Floor: skin over the anal triangle
3. Perinealbranches of the posterior femoral cutaneous n.
4. Pudendalcanal (Alcock’s)on lateral wall
Fascialcanal formed by the split in the obturator internusfascia
Transmits the pudendalnerveand internal pudendalvessels
Main nerve of the perineum, and chiefsensory nerve to the external genitalia
Leaves the pelvis through the greatersciatic foramen, and enters the perineum through the lesser sciatic foramen.
Distribution and branches of theInternal Pudendal artery (branch of internal iliac a.)
5. Dorsala. of penis or clitoris – glans and prepuce
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