BIOL 2005 Lecture Notes - Lumbosacral Plexus, Obturator Foramen, Urogenital Triangle

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30 Jan 2013
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Outline of Lecture 11
Pelvis and Perineum
I. Bones
- Anteriorly tilted bowl shape, symmetrical
- Three general pelvic shapes: gynaecoid (female), anthropoid (male), android
(both)
- Structures of the innominate
- Ilium
- Anterior/Posterior superior/inferior iliac spine (all 4 combos)
- Iliac crest
- Greater sciatic notch (inferior part of it is ischial)
- Iliac tuberosity
- Ala (wing)
- Iliac fossa
- Gluteal surface
- Ischium
- Ischial spine
- Lesser sciatic notch
- Ischial tuberosity
- Body
- Ramus
- Pubis
- Pubic tubercle (aligned vertically with ant. sup. iliac spine when
standing)
- Superior and inferior rami
- Not easily classified (e.g. overlapping)
- Oburator foramen (ischium + pubis)
- Acetabulum (all 3)
- Ischiopubic ramus
- Sacrum (fusion of 5 sacral vertebrae)
- Promontory ( L5)
- Coccyx (fusion of 3-5 coccygeal vertebrae; fusion to sacrum after age 40)
II. Joints (3)
A. Sacroiliac joint: synovial joint between sacrum and ilium
B. Pubic symphysis: fibrocartilaginous joint between two pubic bones
C. Hip joint: acetabulum holds femur in place; locomotion, transfer of weight
III. Ligaments (5, all paired)
A. Inguinal: connects ant. sup. iliac spine to pubic tubercle, from external oblique
muscle
B. Sacroiliac: connects sacrum and ilium; stabilize sacroiliac joint
C. Iliolumbar: connects ilium and L5
D. Sacrotuberous: connects sacrum to ischial tuberosity, X with sacrospinous
E. Sacrospinous: connects sacrum to ischial spine, superficial to sacrotuberous
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