ANATOMY

Detailed explanation-1: -The orbicularis oculi muscles circle the eyes and are located just under the skin. Parts of this muscle act to open and close the eyelids and are important muscles in facial expression.

Detailed explanation-2: -The orbicularis oculi muscles are the main protractors (closure) of the eyelids. It is a flat, ringlike band of skeletal muscle surrounding the anterior orbit composed of three parts: the orbital portion, the palpebral portion, and the lacrimal portion.

Detailed explanation-3: -Introduction. Orbicularis oris muscle, also known as musculus orbicularis oris is a complex, multi-layered muscle which attaches through a thin, superficial musculoaponeurotic system to the dermis of the upper lip and lower lip and serves as an attachment site for many other facial muscles around the oral region.

Detailed explanation-4: -The orbicularis oris muscle contributes to the form and shape of the lips. Contraction of this muscle closes and protracts the lips (Fig. 2.13). The position and movement of the lips is acted upon by several mimetic muscles that elevate and depress the lips.

Detailed explanation-5: -Orbicularis oris is a complex circular muscle that surrounds the orifice of the mouth and forms the majority of the lips. It belongs to a large group of muscles of facial expression called the buccolabial group.