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Orbicularis Oculi. Orbicularis means circular muscle and oculi means eye. This is a circular (sphincter) muscle that goes around the eye. Fibers anchor the frontal bone and maxillary bone and inserts into the eyelid so that when it contracts it closes the eye.he origin of this is the body of the mandible and the insertion is the skin/muscle of the lower lip. Note the triangularis/depressor anguli oris insertion is at the corner of the mouth while the depressor labii inferioris is more medial.
The arrectores pilorum (singular arrector pili) are small muscles attached to hair follicles in mammals. Contraction of these muscles causes the hairs to stand on end [1] - known colloquially as goose bumps. Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles (a follicular unit), and is innervated by the sympathetic branch of the autonomic nervous system. The contraction of the muscle is therefore involuntary - stresses such as cold, fear etc. may stimulate the sympathetic nervous system and thus cause contraction, but the muscle is not under conscious control.