convolu'tion. 1

The proce of winding spirally or irregularly. 2. A coil of intestine, also a raised portion of similar appearance on the surface of the brain. 3. The phase or condition of a nucleus in indirect or karyokinetic division in which the nuclear fibrils become sharply defined, twisted, and convoluted, so as to give somewhat the appearance of an irregularly wound ball of twine, angular c. A gyrus, sometimes extremely complex, CONVOLUTION which forms the posterior portion of the inferior parietal lobule, annectant c's. The four gyri which connect the c's on the upper surface of the occipital lobe with the parietal and temporosphenoidal lobes, anterior central c. See ascending frontal c. anterior choroid c. See