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30 Cards in this Set
- Front
- Back
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What separates the two divisions of the bony pelvis?
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Pelvic inlet (separates greater and lesser)
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What four lines make up the pelvic inlet?
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Sacral promontory, arcuate lines, pectineal lines, pubc symphysis
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What is another name for the pelvic outlet?
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Inferior pelvic aperture
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What two muscles form the lateral walls of the pelvic cavity?
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Piriformis & obturator internus
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What two muscles form the floor of the pelvic cavity? (also known as pelvic diaphragm)
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Levator ani muscles and coccygeus muscle
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What two structures in both sexes pass through the levator ani? What role does the levator ani play?
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Anus and urethra; voluntary control of both
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What are the three parts of the levator ani?
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Iliococcygeus, pubococcygeus, puborectalis
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Which of the three levator ani muscles forms a loop around the rectum?
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puborectalis
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Which of the three levator ani muscles is the strongest?
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pubococcygeus (originates from pubis to coccyx)
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What innervates the pelvic diaphragm?
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S3, S4, S5 ventral rami
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What can a tear in the pubococcygeus during childbirth cause?
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Cystocele (urinary incontinence) or rectocele (defecatory dysfunction)
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What can occur when there is a prolonged increase in abdominopelvic pressure that weakens the pelvic diaphragm?
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Prolapsed uterus
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What ligament connects the sacrum to the pubic tuberosity?
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Sacrotuberous ligament
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What ligament runs on top of the sacrotuberous ligament, connecting the ishial spine to the sacrum?
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Sacrospinous ligament
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Which muscle lies on the interior medial surface of the hip and whose tendon passes laterally through the lesser sciatic foramen?
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Obturator internus
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What muscle exits through the greater foramen and attaches to the femur?
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piriformis
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The obturator is covered by a fascia called the obturator fascia. What thick line forms and provides attachment for muscles on the pelvic floor?
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Arcus tendineus
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4 major passageways for entering and exiting pelvic cavity
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greater sciatic foramen, lesser sciatic foramen, obturator canal, beneath the inguinal ligament
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5 things passing through the greater sciatic foramen
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Piriformis muscle, Pudendal nerve, internal pudendal a./v., superior/inferior gluteal nerve and vessels, sciatic nerve (PPISS)
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2 things passing through lesser sciatic foramen
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obturator internus muscle/tendon, pudendal nerve and internal pudendal vessels into perineum
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1 thing through the obturator canal
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obturator nerve and vessels into medial thigh
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5 things beneath inguinal ligament
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Muscular lacuna-Iliopsoas muscle, femoral nerve, lateral femoral cutaneous nerve
Vascular lacuna-femoral artery and vein |
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Of the lumbosacral plexus, what nerves form the lumbar plexus?
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L1-L4 ventral rami
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Of the lumbosacral plexus, what nerves form the sacral plexus?
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L4,L5, S1-S4 ventral rami
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Of the lumbosacral plexus, what nerves form the coccygeal plexus?
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S5-Co1
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Lumbar plexus forms which 4 nerves from L1-L2?
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Superior->inferior
Iliohypogastric nerve Ilioinguinal nerve Lateral femoral cutaneous nerve Genitofemoral nerve |
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What two major nerves form from L2,L3,& L4?
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Femoral nerve and obturator nerve
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What is the key nerve from the sacral plexus that innervates the pelvis region?
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Pudendal nerve (S2,3,4)
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Three arteries off the posterior division of int. iliac a.
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iliolumbar a., lateral sacral a., superior gluteal a.
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Three arteries off the anterior division of int. iliac a.
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Obturator a., umbilical a., uterine(a. of ductus deferens), vaginal a. (inf. vesical a.), middle rectal a., Inferior gluteal a., internal pudendal a.
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