Lecture 2 - Pelvic Floor and Gluteal Muscles Flashcards
What are the parts of the proximal femur? top -> bottom (9)
- head
- fovea (only in posterior view)
-neck - greater trochanter
- trochanteric fossa (only in posterior view)
- lesser trochanter
- intertrochanteric crest (only in posterior view)
- intertrochanteric line (only in anterior view)
- gluteal tuberosity (only in posterior view)
What are the muscles of the pelvic floor? (2)
- ischiococcygeus
- levator ani
Ischiococcygeus: origin
sacrum (inferior end)
Ischiococcygeus: insertion
ischial spine
Ischiococcygeus: action
supports pelvic viscera
Leavtor ani: origins (2)
pubis, superior pubic ramus
Leavtor ani: insertions (II)
anococcyygeal ligament, coccyx
Leavtor ani: action
supports pelvic viscera
What does a hiatus mean?
an opening
Functions of the pelvic floor (3)
- supports abdominal and pelvic viscera
- forms the anal and urogenital hiatueses
- resists increases in intra-abdominal pressure (ex: stops you from peeing when you sneeze)
What are the lateral rotators?
lateral (3) -> medial (3)
- piriformis
- obturator internus
- obturator externus (not seen in posterior view)
- gemellus superior
- gemellus inferior
- quadratus femoris
Piriformis: origin
pelvic surface of the sacrum
Piriformis: insertion
apex of the greater trochanter of the femur
Piriformis: actions (3)
- lateral rotation of hip joint
- abduction of hip joint
- extension of hip joint
Sciatic nerve: origin
lumbosacral plexus (L4, L5, S1, S2, S3)
What muscle is the sciatic nerve inferior to?
the piriformis
What hole does the sciatic nerve pass through?
the greater sciatic foramen
Obturator externus: origin
outer surface of the obturator membrane