Orbicularis oris muscle

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Orbicularis Oris Muscle[edit | edit source]

File:Orbicularis oris muscle.png
Orbicularis oris muscle

The Orbicularis oris muscle is a complex muscle located in the face. It is one of the muscles used in the facial expression and is responsible for the movements of the mouth and lips.

Anatomy[edit | edit source]

The orbicularis oris muscle is not a simple sphincter muscle like the orbicularis oculi. It consists of numerous strata of muscular fibers surrounding the orifice of the mouth, but has no bony attachments.

Function[edit | edit source]

The primary function of the orbicularis oris muscle is to control the movements of the mouth and lips. It enables us to close our lips, protrude our lips as in a pout, or contract our lips over our teeth.

Clinical significance[edit | edit source]

Damage to the orbicularis oris muscle can result in a loss of muscle control in the mouth and lips, which can lead to difficulties in speech, eating, and facial expression.

See also[edit | edit source]

References[edit | edit source]

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Contributors: Prab R. Tumpati, MD