Zygomaticus minor muscle

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== Zygomaticus Minor Muscle ==

The Zygomaticus minor muscle is a slender band of muscle on each side of the face that is involved in facial expression. It is one of the muscles of facial expression and is innervated by the facial nerve.

Anatomy

The zygomaticus minor muscle originates from the zygomatic bone, specifically from the lateral surface of the bone. It extends obliquely downward and medially to insert into the skin of the upper lip, just lateral to the insertion of the levator labii superioris muscle.

Function

The primary function of the zygomaticus minor muscle is to elevate the upper lip, which contributes to facial expressions such as smiling. It works in conjunction with other muscles, including the zygomaticus major muscle, to produce a range of facial expressions.

Innervation

The zygomaticus minor muscle is innervated by the buccal branch of the facial nerve (cranial nerve VII). This nerve is responsible for controlling the movements of the muscles of facial expression.

Blood Supply

The blood supply to the zygomaticus minor muscle is provided by branches of the facial artery and the transverse facial artery.

Clinical Significance

Dysfunction of the zygomaticus minor muscle can result in an asymmetrical smile or difficulty in elevating the upper lip. This can occur due to damage to the facial nerve or its branches, which may be caused by trauma, surgery, or neurological conditions such as Bell's palsy.

See Also

• Zygomaticus major muscle
• Muscles of facial expression
• Facial nerve
• Facial artery