Definition of coccyx:
When distended, its long axis will be found to coincide with a line passing from a point midway between the navel and pubes to the point of the coccyx, the obliquity of this direction being greatest when the body is in the erect posture, for the intestines now gravitate upon it.- "Surgical Anatomy", Joseph Maclise.
The posterior perinaeal space may be described on the surface by two lines drawn from D D, the ischiatic tuberosities, to C, the point of the coccyx, whilst the transverse line between D and D bounds it above.- "Surgical Anatomy", Joseph Maclise.
- "The Descent of Man and Selection in Relation to Sex, Vol. I (1st edition)", Charles Darwin.