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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. Coccyx fracture - Wikipedia

    en.wikipedia.org/wiki/Coccyx_fracture

    A coccyx fracture is a fracture of the coccyx, commonly called a broken tailbone or ‘puzzle fracture.’. The coccyx is located at the base of the spine, under the sacrum. It is the last section of the ape vertebral column. Most commonly in humans it comprises 3 to 5 fused (or, more rarely, separate) vertebrae, and is approximately 4 to 10 cm ...

  4. Coccydynia - Wikipedia

    en.wikipedia.org/wiki/Coccydynia

    Coccydynia occurs in the lowest part of the spine, the coccyx, which is believed to be a vestigial tail, or in other words the "tail bone". The name coccyx is derived from the Greek word for 'cuckoo' due to its beak-like appearance. The coccyx itself is made up of three to five vertebrae, some of which may be fused together.

  5. Coccygectomy - Wikipedia

    en.wikipedia.org/wiki/Coccygectomy

    Coccygectomy. Coccygectomy is a surgical procedure in which the coccyx or tailbone is removed. It is considered a required treatment for sacrococcygeal teratoma and other germ cell tumors arising from the coccyx. Coccygectomy is the treatment of last resort for coccydynia (coccyx pain) which has failed to respond to nonsurgical treatment.

  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. Human vestigiality - Wikipedia

    en.wikipedia.org/wiki/Human_vestigiality

    The coccyx, or tailbone, is the remnant of a lost tail. [19] All mammals had a tail at some point in their development; in humans, it is present for a period of 4 weeks, during stages 14 to 22 of human embryogenesis. [20] This tail is most prominent in human embryos 31–35 days old. [21]

  8. 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 ...

  9. Sacral fracture - Wikipedia

    en.wikipedia.org/wiki/Sacral_fracture

    Sacral fracture. 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 uncommon. They tend to be caused by high-energy trauma, for example in road traffic accidents or in falls.

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