Class 14 Post. Abdominal Wall; Bony Pelvis

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princessmagonda
ID:
93354
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Class 14 Post. Abdominal Wall; Bony Pelvis
Updated:
2011-07-07 22:31:55
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Class Post Abdominal Wall Bony Pelvis
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Class 14 Post. Abdominal Wall; Bony Pelvis
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  1. Quadratus Lumborum (post. abdominal)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: lat. lip of iliac crest; iliolumbar ligament
    • Insertion: infer. of 12th rib; lumbar transverse processes
    • Innervation: ant. branches of T12 & L1-L4 nerves
    • Action: Bilaterally extends lumbar & unilaterally is ipsilateral lat. flex of vertebral column
  2. Iliacus (Post. abdominal wall)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: iliac fosssa of os coxa; ala of sacrum; ant. sacro-iliac ligament
    • Insertion: lesser trochanter of the femur (tubercles); psoas major tendon
    • Innervation: femoral nerve (L2-L4)
    • Action: flexes thigh and stabilize hip joint.
  3. Psoas Major (post. abdominal)
    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: transverse processes of lumbar vert.; sides of bodies of T12-S1 vert. and discs
    • Insertion: strong tendon to lesser trochanter of femur
    • Innervation: lumbar plexus via ant. branches of nerves L2-L4.
    • Action: acting inferiorly w/iliacus flexes thigh; acting superiorly, flexes vert. column laterally to balance the trunk. when sitting, acts inferiorly with iliacus to flex trunk.
  4. Iliopsoas

    Origin?
    Insertion?
    Innervation?
    Action?
    What does it form?
    • Origin: psoas + iliacus
    • Insertion: lesser trochanter of femur (tubercles)
    • Innervation: L2
    • Action: hip flexor
    • Forms the floor of femoral triangle
  5. coccygeus (pelvic diaphragm)

    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: ischial spine
    • insertion: infer. end of sacrum
    • innervation: branches of S4 and S5
    • Action: forms small part of pelvic diaphragm that supports pelvic viscera; flexes coccyx
  6. Levator Ani including pubococcygeus and iliococcygeus) (pelvic walls and floor)

    Origin?
    Insertion?
    Innervation?
    Action?
    • Origin: body of pubis, tendinous arch of levator ani, ischial spine
    • Insertion: perineal body, coccyx, anococcygeal ligament, walls of prostate or vagina, rectum, anal canal
    • innervation: nerve to levator ani (branch of S4), inferior anal (rectal) nerve, coccygeal plexus
    • action: support pelvic viscera; resists increases in intra-abdominal pressure
  7. Obturator inernus (os coxa)
    where does in go in?
    origin?
    insertion?
    innervation?
    action?
    • Goes in less sciatic foramen
    • origin: pelvic surface of ilium and ischium; obturator membrane
    • insertion: greater trochanter of femur
    • innervation: nerve to obturator internus (L5, S1, S2)
    • action: rotates thigh laterally; assists in hold head of femur in acetabulum
  8. Piriformis (pelvic walls and floor)

    Where does it go?
    origin?
    insertion?
    innervation?
    action?
    • It goes in the greater sciatic foramen
    • Origin: pelvic surface of 2nd-4th sacral segments; sup. margin of greater sciatic notch and sacrotuberous ligament
    • insertion: greater trochanter of femur
    • innervation: ant. rami of S1 and S2
    • action: rotates thigh laterally; abducts thigh; assists in holding head of femur in acetabelum

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