The inner or ventral portion of the sphenoid bone in the skull.
From Greek 'entos' (inside) and 'sphenoid' (wedge-shaped). This anatomical noun specifically names an internal division of a major cranial bone.
Scientists love dividing bones into regions, so the sphenoid bone gets split into 'entosphenoid' (the inside part) and other sections—it's like naming different rooms in a bony house.
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