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The answer is sulcus.
They are called sulci and they allow for a greater surface area of the cortex of the brain which is where the majority of the neurons reside.
Postcentral gyrus, or the parietal lobe [Edit: The postcentral gyrus is posterior to the central sulcus, not anterior. The primary motor cortex is located directly anterior to the central sulcus.]
the central sulcus!
lateral sulcus
Median sulcus of tongue
the posterior median sulcus
anterior lateral sulcus
If you're referring to the cortex of bone, that would be trabeculae.
The answer is sulcus.
Promachoteuthis sulcus was created in 2007.
The Sullen Sulcus was created in 2002.
Sulci is the plural of sulcus
Fissure is deeper than a sulcus
Interventricular Sulcus
Central Sulcus
Without adequate oral hygiene, bacteria can grow anywhere on a tooth. However, the most common areas are the sulcus (space between the tooth and gum) interproximal (between the teeth) and in the grooves of the biting surface.