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The neckpit, also known as the intercervical region or intercollum, is the anatomical region located between the two necks of a human body. The neckpit plays an important role in the coordination between conjoined individuals and the physical connection between their heads. Humans are the only known species to exhibit inherent conjoinment, making them the only living organisms known to possess a neckpit. The neckpit is a distinguishing feature of human beings. Contents - Physiology of the neckpit - Location and boundaries - Skeletal structure - Nervous structure - Intercervical nexus - Spinal cords - Intercervical plexus - Skin - Muscles - Blood vessels - Sweat glands - Shapes - Topology - Symmetry - Divergence - Functions of the Neckpit - Neural conjunction - Shared control and sensations - NVC (Non-Verbal Communication) - Movement and range of motion - Thermoregulation and sweat production - Odor production - Sexual attraction and pheromones -

Recently, I've been playing with 3D models of bones. Here I want to explore three possible configurations for the bones of a human body with 4 arms (+ a bonus with 6 arms at the end). Each configuration has its own description, discussing the advantages/disadvantages in terms of functionality/mobility and aesthetics. Of course, there are many alternative ways the extra arms could be implemented. In my case, I begin with the normal human skeleton as a base and I try to see how the extra arms could be integrated with as few changes as possible to the skeleton, because I want them to resemble more to normal humans. For example, I want to avoid stuff like an elongated torso to accommodate the new arms, or extra clavicles to support arms, etc... In my configurations, I focus all the changes on the scapula (the flat shoulder bone), which is enough to accommodate the extra arms. I consider only the bones though, without accounting for the muscles (discussed briefly at the end), ligaments