The number and size of the coccygeal vertebr vary, apparently in correlation with the increased size of the tail.
In the pig, it also takes origin higher up from the sacro-sciatic ligament and the coccygeal aponeurosis.
In the pig, and especially in the horse, it passes further upwards, to arise from the aponeurosis of the coccygeal muscles.
1610s, from Latin coccyx, from Greek kokkyx "cuckoo" (from kokku, like the bird's English name echoic of its cry), so called by ancient Greek physician Galen because the bone in humans supposedly resembles a cuckoo's beak.
coccygeal coc·cyg·e·al (kŏk-sĭj'ē-əl)
Relating to the coccyx.
coccyx coc·cyx (kŏk'sĭks)
n. pl. coc·cy·ges (kŏk-sī'jēz, kŏk'sĭ-jēz')
The small triangular bone located at the base of the spinal column, formed by the fusion of four rudimentary vertebrae, and articulating above with the sacrum. Also called tailbone.