Muscles of Pelvic Wall And Floor Flashcards
Boundary of the Obturator internus?
Lateral Wall
Proximal Attachment (Origin) of the Obturator internus?
- Pelvic surface of ilium and ischium
- Obturator membrane
Distal Attachment (Insertion) of the Obturator internus?
Greater Trochanter of femur
Innervation of the of the Obturator internus?
Nerve to obturator muscle (l5, S1, S2)
Main action of the of the Obturator internus?
- Rotates thigh laterally.
- Assists in holding head of femur in acetabulum
Boundary of the Piriformis?
Posterosuperior wall
Proximal Attachment (Origin) of the Piriformis?
- Pelvic surface of S2-S4 segments
- Superior Margin of greater sciatic notch and sacrotuberous ligament
Distal Attachment (Insertion) of the Piriformis?
Greater Trochanter of femur
Innervation of the of the Piriformis?
Anterior rami of S1 and S2
Main action of the of the Piriformis?
- Rotates thigh laterally
- Abducts thigh
- Assists in holding head of femur in acetabulum
Boundary of the Coccygeus (ischiococcygeus)?
Floor
Proximal Attachment (Origin) of the Coccygeus (ischiococcygeus)?
Ischial Spine
Distal Attachment (Insertion) of the Coccygeus (ischiococcygeus)?
Inferior End of sacrum and coccyx
Innervation of the of the Coccygeus (ischiococcygeus)?
Branches of S4 and S5 spinal nerves
Main action of the of the Coccygeus (ischiococcygeus)?
- Forms small part of pelvic diaphragm that supports pelvic viscera
- Flexes coccyx
What muscles make up the Levator ani?
- Puborectalis
- Pubococcygeus
- Iliococcygeus
Boundary of Levator ani?
Floor
Proximal Attachment (Origin) of the Levator ani?
- Body of pubis
- Tendinous arch of obturator fascia
- Ischial spine
Distal Attachment (Insertion) of the Levator ani?
- Perineal body
- coccyx
- anococcygeal ligament
- walls of prostate or vagina, rectum and anal canal
Innervation of the of the Levator ani?
Nerve to levator ani (branches of S4), inferior anal (rectal) nerve, and coccygeal plexus
Main action of the of the Levator ani?
Forms most of pelvic diaphragm that helps support pelvic viscera and resists increases in intra-abdominal pressure
