Torso
The torso or trunk was the central part of one's body. 

In 2368, Doctor Beverly Crusher described a proposed course of treatment for Worf's spinal injury, in which neural transducers would be implanted in the Klingon's lower torso and legs. () 

In 3189, an atomic scan of s musculoskeletal system revealed that the lean mass of her trunk was 19.9 kilograms (kg). ()

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Anatomy