Depressor anguli oris muscle

Depressor Anguli Oris Muscle is a facial muscle associated with frowning. It originates from the mandible and inserts into the modiolus of the mouth, allowing it to pull the corners of the mouth down to express sadness or discontent.

Etymology

The term "Depressor Anguli Oris" is derived from Latin, where "Depressor" means 'that which lowers', "Anguli" translates to 'angle', and "Oris" refers to 'of the mouth'. Thus, the term literally means 'that which lowers the angle of the mouth'.

Anatomy

The Depressor Anguli Oris is a triangular muscle located on the lower side of the face. It originates from the oblique line of the mandible, where it is continuous with the platysma. The muscle fibers run upwards and medially, inserting into the angle of the mouth where they intermingle with the muscles of the upper lip.

Function

The primary function of the Depressor Anguli Oris is to lower the corners of the mouth. This action is commonly associated with expressions of sadness or frowning. The muscle also assists in opening the mouth.

Clinical Significance

Damage or paralysis of the Depressor Anguli Oris can result in an inability to frown or lower the corners of the mouth. This can occur due to trauma, surgery, or neurological conditions such as Bell's palsy.

Related Terms

• Facial muscles
• Mandible
• Modiolus
• Platysma
• Bell's palsy

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