Commentary - Anatomy GUT Women and Mens Health Flashcards
The bony pelvis is composed of the ____ and _____. Which are separated by the ______.
True and false pelvis
Arcuate line
Describe the positioning of the pelvic inlet.
Tilted 50-60 degrees forwards
What are the margins of the pelvic outlet?
The pubic symphysis, ischiopubic rami, ischial tuberosity, sacrotuberous ligaments, and the coccyx
What structures are found above the piriformis muscle?
Greater sciatic foramen, superior gluteal vessels and nerve
What structures are found below the piriformis muscle?
Inferior gluteal nerve and vessels, internal pudendal nerve, pudendal nerve, and sciatic nerve.
What structure separates the greater sciatic foramen from the lesser?
Sacrospinous ligament
What structures pass through the lesser sciatic foramen?
Internal pudendal vessels and nerve
Dermatomes of the perineum?
Sacral segments S3 to S5
Nerve roots to skeletal muscles of perineum and pelvic floor?
S2 to S4
What is the major nerve of the perineum?
the pudendal nerve
Site of a pudendal nerve block?
Inside of the ischial tuberosity
Is the inferior hypogastric plexus visceral afferent, PSNS, or SNS?
All 3
Blood is supplied to the pelvis by?
Internal iliac artery, which splits into an anterior and posterior trunk
What perineal structure is not supplied by the internal iliac artery?
Penis
The urogenital diaphragm/perineal membrane is composed of?
Thick triangular fascia with muscles inside
The pelvic diaphragm is composed of?
Levator ani (iliococcygeus, pubococcygeus, and puborectalis) Coccygeus muscle
The urogenital hiatus is a space formed between?
Muscles of the levator ani
What passes through the urogenital hiatus?
Urethra and vagina
What is the perineal body?
The junction of the levator ani and perineal membrane
Is the internal anal sphincter smooth or skeletal muscle?
Smooth
What controls the internal anal sphincter?
PSNS
Is the external anal sphincter smooth or skeletal muscle?
Skeletal
What muscles compose the external anal sphincter?
Deep, superficial, and subcutaneous external anal sphincter muscles
What is the anal pecten?
Transition from rectal mucosa to nonkeratinized squamous epithelium