(anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain

Usage examples of sulcus.

There was some combination of water, water-soluble minerals, and temperature that triggered the cysts, and the combination had existed in Cyane Sulci, but no attempt to duplicate those conditions in a lab worked.

Cyane Sulci, damaging the labs where my husband had worked to make the mother cysts bloom, I flew in the last Presidential shuttle, on my last official tour of a disaster area.

The sulci and gyri are fairly standardized from brain to brain, and the more prominent ones are named and mapped.

It is the most prominent of all the sulci, and is sometimes called the fissure of Sylvius, after the professional pseudonym of a i/th-century French anatomist who first described it.

The portion of the cerebral hemisphere lying to the front of the central sulcus and before the point at which the lateral sulcus begins is the frontal lobe.

A lung fluke did the same for the chest and upper body cavity, a third genemod parasite inhabited one of the larger sulci of the brain and warded off tumor growth, Parkinson's, and Alzheimer's.

Behind the central sulcus and above the lateral sulcus is the parietal lobe (puh-ry'ih-tal).

In the Lycus and Cyane Sulci, spread across a broad band north of the old shield volcano Olympus Mons, canyons twist and shove across a thousand kilometers like the imprint of a nest of huge and restless worms.

During one memorable day away from my duties, he showed me a broad canyon in Cyane Sulci chosen for a major mother cyst experiment.

Melas Doras had none of the drama of the sulci, none of the color of Sinai, no fossils, no minerals .

The Cyane Sulci team had finished a larger test dome for the first big experiment with the intact mother cysts.

I picked up my slate and searched for a good picture and yes, there he was, smiling over a mother cyst at Cyane Sulci, and here on the day of our ceremony, uncomfortable in a formal suit.

The water boiled from the northern rapes, some of it coursing into the sulci, flooding the hundreds of kilometers in between to a depth of several meters.

My mother had just become President of Mars, under the New Republic Constitution, and she, my father, and I were making the pilgrimage across Cyane Sulci to Casseia's home, as had become traditional in the past few administrations.

She smiled, shook our hands, and invited us into her house, perched on the edge of the Cyane Sulci Preserve, where we removed our suits and showered and became comfortable.