Procerus muscle

Procerus muscle is a small, pyramidal-shaped facial muscle that is located in the area of the nose. It is involved in the expression of emotions, particularly in conveying frowns or expressions of disdain. The procerus muscle originates from the nasal bone and the lateral nasal cartilage, extending upwards to insert into the skin between the eyebrows. Its primary function is to pull the skin between the eyebrows downward, which creates horizontal wrinkles across the bridge of the nose. This action is often associated with a frown or a look of anger.

Anatomy

The procerus muscle is part of the superficial musculoaponeurotic system (SMAS), which is a layer of tissue covering, investing, and forming the terminations of the muscles in the facial area. The muscle fibers of the procerus extend vertically from the lower part of the nasal bone to the forehead skin, specifically between the eyebrows. It lies above the nasal bone and below the frontalis muscle, and is closely associated with the nasalis muscle and the depressor septi nasi muscle, which are also involved in the movement of the nose and upper face.

Function

The primary function of the procerus muscle is to draw down the medial angle of the eyebrows, producing transverse wrinkles over the bridge of the nose. This action is commonly associated with expressions of anger, annoyance, or concentration. By contracting, the procerus muscle allows for a wide range of facial expressions that are crucial for non-verbal communication.

Clinical Significance

The procerus muscle is often a target in cosmetic procedures aimed at reducing facial wrinkles. Botulinum toxin injections, commonly known as Botox, can be used to temporarily paralyze the procerus muscle, smoothing out the wrinkles on the lower forehead and between the eyebrows. This procedure is popular among individuals seeking to reduce signs of aging or improve their facial aesthetics by achieving a more relaxed and youthful appearance.

In addition to cosmetic procedures, understanding the anatomy and function of the procerus muscle is important in the diagnosis and treatment of certain medical conditions. For example, hyperactivity of the procerus muscle can contribute to chronic headaches and migraines due to the tension created in the facial region.

See Also

• Facial muscles
• Botulinum toxin
• Facial expression
• Cosmetic procedures