Depressor labii inferioris muscle

Depressor labii inferioris muscle (highlighted in green)

The Depressor Labii Inferioris Muscle is a facial muscle that helps in the movement of the lower lip. It is located in the human face and is one of the muscles involved in facial expression.

Anatomy

The Depressor Labii Inferioris originates from the mandible, specifically the oblique line of the mandible, and inserts into the skin of the lower lip. It is innervated by the facial nerve (cranial nerve VII) and its blood supply comes from the facial artery.

Function

The primary function of the Depressor Labii Inferioris is to lower the bottom lip, which aids in expressions of sadness or doubt. It also assists in opening the mouth and is involved in the articulation of certain sounds during speech.

Clinical Significance

Damage to the Depressor Labii Inferioris can result in a drooping lower lip, which can affect speech and eating. This can occur due to trauma, surgery, or neurological conditions that affect the facial nerve.

See Also

• Facial muscles
• Facial nerve
• Facial artery
• Mandible

References

• Gray, Henry. Anatomy of the Human Body. Philadelphia: Lea & Febiger, 1918; Bartleby.com, 2000. www.bartleby.com/107/.

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