perineum Flashcards
what makes up the pelvic diapragm
levator ani and coccygeaus muscles
boundaries of the perineum
anteriorly: pubic sympysis
laterally: ischial tuberosities
posteriorly: sacrum and coccyx
perineal triangles
Transverse line joining ischial tuberosities
Anal triangle-posterior to line
Urogenital (UG) triangle-anterior to line
- Closed by the perineal membrane
perineal body
fibromuscular mass between anal canal and perineal membrane
the perineal body is a site of convergence for
Bulbospongiosus
External anal sphincter
Superficial transverse perineal muscle
glands of the perineum
Greater vestibular glands (female)
Bulbourethral glands (male)
muscles of perineum
Bulbospongiosus and ischiocavernosus (male and female)
External anal and urethral sphincters
Deep and superficial transverse perineal muscles
erectile tissues of perineum
corpus spongiosum and corpora cavernosa (male and female)
primary nerve supplying motor and sensory to ther perineum
prudendal nerve
branches of the pudenal nerve
inferior anal nerve
perineal nerve (superficial and deep)
dorsal nerve of penis or clitoris (sensory only)
what innervates the external anal sphincter and perianal skin
inferior anal (rectal) nerve
main arterial supply of the perineum
internal pudendal artery
anal columns of canal
Superior half of the mucous membrane of the anal canal
Contain terminal branches of the superior rectal artery and vein.
Inferior ends of the anal columns are joined byanal valves.
pectinate line of anal canal
An irregular line formed by the inferior aspect of the anal valves
Junction of the superior part (visceral) and the inferior part (somatic).
The superior and inferior parts differ in arterial supply and innervation
arterial supply of anal canal
superior rectal artery
inferior rectal artery
middle rectal arteries
