| coccygeal plexus | A small plexus formed by the fifth sacral and the coccygeal nerves; it gives origin to the anococcygeal nerves. Synonym: plexus coccygeus. (05 Mar 2000) |
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| coccygeal segments of spinal cord | The three coccygeal segments [Co1-Co3] of the spinal cord which give rise to the three pairs of coccygeal spinal nerves and constitute the coccygeal part of the spinal cord. (05 Mar 2000) |
| coccygeal sinus | A fistula opening in the region of the coccyx, being the result of incomplete closure of the caudal end of the neurenteric canal. See: pilonidal sinus. (05 Mar 2000) |
| coccygeal vertebrae | The four terminal segments of the vertebral column, usually fused to form the coccyx. Synonym: vertebrae coccygeae, tail vertebrae. (05 Mar 2000) |
| coccygeal whorl | A spiral arrangement of coarse hairs sometimes present over the region of the coccyx. Synonym: coccygeal whorl. (05 Mar 2000) |
| coccygectomy | Removal of the coccyx. Origin: coccyx + G. Ektome, excision (05 Mar 2000) |
| coccygeus | <anatomy, muscle> Origin, spine of ischium and sacrospinous ligament; insertion, sides of lower part of sacrum and upper part of coccyx; action, assists in support of pelvic floor, especially when intra-abdominal pressures increase; nerve supply, third and fourth sacral. Synonym: musculus coccygeus, coccygeal muscle, musculus ischiococcygeus. (05 Mar 2000) |
| coccygodynia | Coccyodynia pain in the coccygeal region. Synonym: coccyalgia, coccydynia, coccygalgia, coccyodynia. Origin: coccyx + G. Odyne, pain (05 Mar 2000) |
| coccygotomy | Operation for freeing the coccyx from its attachments. Origin: coccyx + G. Tome, a cutting (05 Mar 2000) |
| coccyodynia | Coccyodynia pain in the coccygeal region. Synonym: coccyalgia, coccydynia, coccygalgia, coccyodynia. Origin: coccyx + G. Odyne, pain (05 Mar 2000) |
| coccyx | <anatomy> The last bone of the spinal column, sometimes referred to as man's vestigial tail. The last portion of the vertebral column just below the sacrum. (27 Sep 1997) |
| Cochin China diarrhoea | An obsolete term for tropical sprue. (05 Mar 2000) |
| cochineal | The dried female insects, Coccus cacti, enclosing the young larvae, or the dried female insect, Dactylopius coccus, containing eggs and larvae, from which coccinellin is obtained; used as a red colouring agent and a stain. See: carmine. Synonym: coccinella, coccus. Origin: O.Sp. Cochinilla, wood louse, fr. G. Kokkinos, berry (05 Mar 2000) |
| cochlea | The part of the internal ear that is concerned with hearing. It forms the anterior part of the labyrinth, is conical, and is placed almost horizontally anterior to the vestibule. (12 Dec 1998) |
| cochlear | <anatomy> Of or pertaining to the cochlea. (18 Nov 1997) |