Pelvic diaphragm, urogenital diaphragm and perineum Sanjaya Adikari Department of Anatomy

Describe/draw Pelvic diaphragm/floor Urogenital and anal triangles Urogenital diaphragm Deep perineal pouch & contents Superficial perineal pouch & contents

Pelvic diaphragm/Floor Consists of Levator ani Coccygeus Superior and inferior pelvic fascia

Pelvic diaphragm

Pelvic diaphragm… Obturator fascia Ischiococcygeus Iliococcygeus Pubococcygeus White line (tendinous arch) Levator ani Coccygeus

Puborectalis Pubovaginalis Urogenital hiatus

Puborectalis, pubovaginalis, levator prostatae Anorectal junction Puborectalis Anococcygeal raphe Pubovaginalis Levator prostatae

Levator prostatae Puboprostatic ligaments

Perineum Sacrotuberous ligament Coccyx Anal triangle subpubic angle Urogenital triangle Ischiopubic ramus Anterior end of ischial tuberosity

Perineal triangles

Sacrotuberous ligament

Perineal body Fibromuscular mass to which pelvic diaphragm and perineal muscles are attached Perineal body/central perineal tendon Pubis

Urogenital diaphragm Deep perineal pouch Prostate External Sphincter Perineal membrane/inferior fascia UD Prostate External Sphincter Perineal body/ central perineal tendon

Urogenital diaphragm Consists of Superior fascia (blends with inferior pelvic fascia) Inferior fascia (perineal membrane) Sphincter urethrae muscle Deep transverse perineal muscles

Deep perineal pouch Space between the superior and inferior fasciae of the urogenital diaphragm Contents Membranous urethra Internal pudendal vessels Dorsal nerve of penis Perineal nerve Bulbourethral glands (Bartholin glands in superficial pouch) Sphincter urethrae and deep transverse perineal muscles

Deep perineal pouch Bulbourethral glands Sphincter urethrae Vessels and nerves Deep transverse perineal muscles

Superficial perineal pouch Membranous layer of superficial fascia of abdomen/ fascia Scarpa Superficial perineal fascia/Colles Superficial perineal pouch Corona of glans penis

Attachment of superficial perineal fascia membrane

Superficial perineal pouch…. Cont. ischioanal fossa superficial transverse perineal muscle bulbospongiosus ischiocavernosus superficial perineal fascia

Superficial perineal pouch Space between the superficial perineal fascia and the perineal membrane Contents Bulbospongiosus muscle Ischiocavernosus muscle superficial transverse perineal muscles Root and the body of the penis testicles

Parts of the penis & muscle attachments Bulbospongiosus Bulb Crus Corpus spongiosum Corpus cavernosum Root Body Glans Ischiocavernosus

Anal canal Tube within a funnel Levator ani External anal sphincter skeletal muscle Internal anal sphincter smooth muscle

Ischioanal (ischiorectal) fossa Obturator internus and fascia Ischial tuberosity Skin

External anal sphincter Anococcygeal body Deep Superficial Subcutaneous

Nerve to obturator internus Sacrospinous ligament Internal pudendal artery Pudendal nerve Ischial spine

Nerve to obturator internus Internal pudendal artery Pudendal nerve Inferior rectal nerve & artery Dorsal nerve of penis Perineal nerve Dorsal artery of penis Perineal artery Deep artery of penis Deep p. pouch Penis Pudendal canal