| os coccygis | <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) |
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| musculus extensor coccygis | <anatomy> An inconstant and poorly developed muscle on the dorsal surfaces of the sacrum and coccyx, the remains of a portion of the tail musculature of lower animals. Synonym: musculus sacrococcygeus dorsalis, dorsal sacrococcygeal muscle, musculus extensor coccygis, musculus sacrococcygeus posterior. (05 Mar 2000) |
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| fovea coccygis | It marks the site where the embryonic spinal cord attaches to the skin. Synonym: postnatal pit of the newborn. (05 Mar 2000) |