Facial Muscles: Anatomy and Its Significance in Botox Treatments

Facial muscles are facial expression muscles that attach directly to the skin and enable facial expressions such as raising the eyebrows, furrowing the brow, and squinting. Many cosmetic Botox treatments target these muscles because their repeated contraction causes facial lines and wrinkles.

Facial expression muscles

The facial expression muscles are small but active muscles that attach directly to the skin. When these muscles contract, the skin moves with them, creating facial expressions. Over time, repeated muscle contractions lead to the formation of permanent lines and wrinkles.

Botox treatments are most often administered to the facial muscles. Botox temporarily reduces the activity of the treated muscle. As the muscle relaxes, the skin overlying it does not wrinkle as it normally would. As a result, the lines caused by muscle activity are smoothed out.

The image shows the main facial expression muscles targeted by many cosmetic Botox treatments. Horizontal forehead wrinkles are primarily associated with activity of the frontalis muscle, while the glabellar lines are caused by contraction of the corrugator supercilii and procerus muscles.

Frontalis – the frontal muscle

The frontalis is a muscle located in the forehead region that raises the eyebrows and forms horizontal wrinkles on the forehead. When this muscle is repeatedly activated, permanent lines may form on the forehead.

In Botox treatment, injections are administered into the frontalis muscle according to an individualized treatment plan.

Read more:
Botox for the forehead

In Botox treatment for the forehead, the injection sites are planned on an individual basis based on the anatomy of the face and muscle function.

Corrugator supercilii – Glabellar lines

The corrugator muscles pull the eyebrows together, forming vertical wrinkles between them.

Botox treatment is targeted at the corrugator muscles.

Glabellar lines It is caused by the contraction of the corrugator and procerus muscles between the eyebrows.

Orbicularis oculi – the muscle surrounding the eye

The orbicularis oculi muscle surrounds the eye and helps close and squint the eyes.

Fine lines around the eyes are caused by the contraction of the orbicularis oculi muscle, for example, when smiling. Botulinum toxin treatment can relax this muscle.

Masseter – masticatory muscle

The masseter muscle raises the lower jaw. It is a powerful closing muscle and is involved in both anterior and posterior occlusion. Botulinum toxin injections into the masseter and temporalis muscles often significantly reduce teeth grinding.

Read more: Botox for bruxism

How does Botox affect muscles?

When a muscle does not receive a normal signal to contract, muscle function is temporarily reduced.