As nouns,
parieto-occipital fissure is a hyponym of
sulcus; that is,
parieto-occipital fissure is a
word with a more specific, narrower meaning than
sulcus:
- sulcus: (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain
- parieto-occipital fissure: a sulcus near the posterior end of each hemisphere that separates the parietal lobes and the occipital lobes in both hemispheres
Other hyponyms of sulcus include
central sulcus,
fissure of Rolando,
Rolando's fissure,
sulcus centralis,
fissure of Sylvius,
lateral cerebral sulcus,
sulcus lateralis cerebri,
Sylvian fissure,
parieto-occipital sulcus,
calcarine fissure,
calcarine sulcus.