The keyboard, mouse, display, and system units are:​

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Illustration: Keyboard: It is used to give input through typing of the keys in keyboard. Mouse: It is used to give input through clicking mouse or selecting the options. System unit: It collectively defines the motherboard and CPU of the computer.

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between the two muscle layers is the myenteric or auerbach's plexus, which controls peristalsis. in the colon, the muscularis externa is much thicker because the feces are large and heavy, requiring more force to push along. the stomach has a third layer of muscularis externa: the inner oblique layer.