The origins and insertions of the latissimus dorsi span the posterior and lateral aspects of the back, connecting the upper limbs to the core and pelvis. (strengthandconditioningresearch.com)
What you'll notice, is the pressure when you're down low is on the lateral aspect of the heel of the hand, and as you come up higher, the pressure will shift inside, the remedial part of the palm. (weckmethod.com)
The heads of the triceps muscle have origins on the medial and lateral posterior aspects of the humerus, and the lateral aspect of the scapula in the case of the long head. (strengthandconditioningresearch.com)