The pigmented circles are called chromatophores. These chromatophores are considered neuromuscular organs, they are operated by a unique motor system that react depending of the environment. They consist of elastic sacculus(small sacs) which contain pigments that are attached to a set of obliquely striated radial muscles, each with their own nerves and glia. When excited by certain factors the muscles contract allowing the expansion of the chromatophorea and when relaxed, the energy stored in the elastic sacculus retracts it.
By neural control of the chromatophores, squids are able to change their appearance almost instantaneously, an important feature in some escape behaviours, discrete camouflage and during agonistic signalling. The size and density of the chromatophores varies according to certain factors such as habit and lifestyle.
Insane In The Chromatophores: Stimulating Squid Skin With Music | Video
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