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15 Cards in this Set
- Front
- Back
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SACRUM
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wedge shaped, comprised of 5 individual bones fused together and labeled S1-S5.
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HOW MANY FOREARM IN THE SACRUM?
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8
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Articulating facet
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with L5
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COCCYX
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tailbone; composed of 3-4 fused bones.
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sacrum and coccyx are part of
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the vertebral column.
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SACRO-ILIAC JOINT
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junction between the sacrum and the ilium, part synovial, part fibrous (iliac side is fibrocartilage, sacral surface is hyaline)
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ILIAC SIDE OF SACRO-ILIAC IS
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fibrocratilage
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SACRAL SURFACE OF THE SACRO-ILIAC IS
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hyaline
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Nutation or sacral flexion occurs when
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the base (top) of the sacrum moves anteriorly and inferiorly. (forward and down) This causes the inferior or lower portion of the sacrum and coccyx to move posteriorly.
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Anterior tilt of the sacrum results in
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the base (top) of the sacrum moving anteriorly while the apex moves posteriorly.
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Nutation occurs with
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trunk flexion or hip extension.
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Counternutation or sacral extension occurs when
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the base (top) of the sacrum moves posteriorly and superiorly (back and up) causing the tip of the coccyx to move anteriorly.
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Counternutation occurs with
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trunk extension or hip flexion.
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Sacrotuberous Ligament
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stretches between ischial tuberosity and edge of the sacrum. Deep to gluteus maximus. This ligament is strong and broad.
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Posterior Sacroiliac Ligaments
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supports the union of the posterior sacrum and ilium. Attachments are from sacrum to area on ilium near PSIS.
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