Human anatomy is far from complete, with ongoing discoveries reshaping understanding of variation, structure, and disease.

Leaf through a textbook, watch a wellness influencer, or listen in at the gym, and it can feel as though the human body has already been mapped to exhaustion. Every muscle named, every nerve traced.

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Angela Bassett in "9-1-1," Hunter McVey in "9-1-1: Nashville," Kate Walsh in "Grey's Anatomy" (ABC) ABC’s Thursday drama lineup is paying off for the network, with “9-1-1,” “9-1-1: Nashville’” and ...

Leaf through a textbook, watch a wellness influencer or listen in at the gym, and it can feel as though the human body has already been mapped to exhaustion. Every muscle named, every nerve traced.