As nouns,
Sylvian fissure is a hyponym of
sulcus; that is,
Sylvian 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
- Sylvian fissure: the deepest and most prominent of the cortical fissures; separates the frontal lobes and temporal 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,
parieto-occipital fissure,
parieto-occipital sulcus,
calcarine fissure,
calcarine sulcus.