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  2. Coccyx - Wikipedia

    en.wikipedia.org/wiki/Coccyx

    A coccyx with four vertebrae below the sacrum. The coccyx is formed of three, four or five rudimentary vertebrae.It articulates superiorly with the sacrum.In each of the first three segments may be traced a rudimentary body and articular and transverse processes; the last piece (sometimes the third) is a mere nodule of bone.

  3. Sacrum - Wikipedia

    en.wikipedia.org/wiki/Sacrum

    Anatomical terms of bone. [ edit on Wikidata] The sacrum (pl.: sacra or sacrums[ 1 ]), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1–S5) between ages 18 and 30. [ 2 ] The sacrum situates at the upper, back part of the pelvic cavity, between the two wings of the pelvis.

  4. Sacrococcygeal symphysis - Wikipedia

    en.wikipedia.org/wiki/Sacrococcygeal_symphysis

    The sacrococcygeal symphysis (sacrococcygeal articulation, articulation of the sacrum and coccyx) is an amphiarthrodial joint, formed between the oval surface at the apex of the sacrum, and the base of the coccyx. It is a slightly moveable joint [1] which is frequently, partially or completely, obliterated in old age, [2] homologous with the ...

  5. Sacral fracture - Wikipedia

    en.wikipedia.org/wiki/Sacral_fracture

    In this picture of the pelvis, the sacrum is the butterfly-shaped bone in the middle Lateral view of the sacrum and the coccyx. A sacral fracture is a break in the sacrum bone. The sacrum is the large triangular bone that forms the last part of the vertebral column from the fusion of the five sacral vertebrae. Sacral fractures are relatively ...

  6. Hip bone - Wikipedia

    en.wikipedia.org/wiki/Hip_bone

    16580 16585, 16580. Anatomical terms of bone. [edit on Wikidata] The hip bone (os coxae, innominate bone, pelvic bone[1][2] or coxal bone) is a large flat bone, constricted in the center and expanded above and below. In some vertebrates (including humans before puberty) it is composed of three parts: the ilium, ischium, and the pubis.

  7. Sacrococcygeal teratoma - Wikipedia

    en.wikipedia.org/wiki/Sacrococcygeal_teratoma

    Sacrococcygeal teratoma (SCT) is a type of tumor known as a teratoma that develops at the base of the coccyx (tailbone) and is thought to be primarily derived from remnants of the primitive streak. [1] Sacrococcygeal teratomas are benign 75% of the time, malignant 12% of the time, and the remainder are considered "immature teratomas" that share ...

  8. Coccygeus muscle - Wikipedia

    en.wikipedia.org/wiki/Coccygeus_muscle

    The coccygeus muscle is posterior to levator ani and anterior to the sacrospinous ligament in the pelvic floor. It is a triangular plane of muscular and tendinous fibers. It arises by its apex from the spine of the ischium and sacrospinous ligament. [3][4] It is inserted by its base into the margin of the coccyx and into the side of the lowest ...

  9. Posterior sacrococcygeal ligament - Wikipedia

    en.wikipedia.org/wiki/Posterior_sacrococcygeal...

    The posterior sacrococcygeal ligament or dorsal sacrococcygeal ligament[1] is a ligament which stretches from the sacrum to the coccyx and thus dorsally across the sacrococcygeal symphysis shared by these two bones. This ligament is divisible in two parts: A short deep part which unites the two bones, and a larger superficial portion which ...