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Pelvic Girdle
| Term | Definition |
|---|---|
| Pelvis | - 4 bones - sacrum, coccyx, right and left os coxae - protects and supports viscera in inferior body cavity - angled anteriorly |
| Pelvic Girdle | left and right hip bones only |
| Os Coxae | - hip bone - ilium, ischium, pubis - these fuse between 13-15 yo - Articulates with sacrum at sacroiliac joint |
| Acetabulum | - articulates with the head of femur - lateral surface - contains Lunate surface - region including all 3 fused bones |
| Lunate Surface | - C-shaped, smooth, curved - articulates with head of femur - |
| Ilium | - largest pubic bone - forms thee superior region of the hip bone |
| Ala | -wide fan-shaped portion of the ilium - stops inferiorly at arcuate line |
| Arcuate line | - medial, surface of the ilium |
| Iliac fossa | - medial, side of the ala, depression |
| Anterior, posterior, Inferior gluteal lines | - On the lateral surface of the ilium - attachment sites for the gluteal muscles |
| Auricular Surface | -(ear) - roughened area - ilium articulates with the sacrum at sacroiliac joint |
| Iliac crest | - superior most ridge of the ilium |
| Greater sciatic notch | - sciatic nerve travels to the lower limb - big divot in bone |
| Ischium | - near the superior and posterior margins of the acetabulum - |
| Ischial Spine | - posterior to the acetabulum - prominent triangle that projects medially |
| Ischial body | - bulky bone superior to the ischial spine |
| Lesser sciatic notch | - semicircular depression inferior to the ischial spine |
| Ischial tuberosity (sitz bones) | - posterolateral border of the ischium - roughened projection |
| Ramus of ischium | Extends from the ischial tuberosity toward its anterior fusion with the pubis |
| Pubis | - fuses with ilium and ischium at the acetabulum |
| Obturator foramen | - space in the hip bone that encircle by both pubic and ischial rami - occlude |
| Pubic Crest | - roughened ridge - anterosuperior surface of the superior ramus - ends at the pubic tubercle |
| Pubic Tubercle | - attachment site for the inguinal ligament |
| Symphysial surface | - roughened area on pubis - articulation between two pubic bones |
| Pectineal line | - originates and extends diagonally across the pubis to merge with the arcuate line |
| Pelvic Brim | - oval ridge that extends from the pubic crest, pectineal line, and arcuate line - divides pelvis into true and false pelvis |
| True pelvis | - inferior to the pelvic brim - encloses pelvic cavity - contains pelvic organs |
| False pelvis | - lies superior to the pelvic brim - enclosed by the ala of iliac bones - houses inferior abdominal organs |
| Pelvic Inlet | - superiorly positioned space enclosed by pelvic brim - space between pubic and sacrum area |
| Pelvic Outlet | - inferiorly placed opening bounded by the coccyx, ischial tuberosity, pubic symphysis - covered with muscles and skin and forms the body of the perineum |
| Perineum | Made from the pelvic outlet |
| Sex differences in pelvis | Female: shallower, wider, ilium flares more laterally, wider sciatic notch, preauricular sulcus |
| Suppubic Angle | - angle formed when left and right pubic bones are aligned at their pubic symphyses. - females is wide, males is narrow |
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