Head and neck actions

Platysma

Mandible Depression

Neck fascia tightening

Occipitofrontalis

Raise the eyebrows

Move galea aponeurotic posteriorly

Masseter

Mandible elevation

Protraction

Temporalis

Mandible elevation

Retraction

Medial Pterygoid

Unilateral —> contralateral lateral deviation

Bilateral —> Mandibular elevation and protraction

Lateral Pterygoid

Unilaterally —> contralateral lateral deviation

Bilaterally —> Mandible protraction

Longus capitis

Unilateral —> Ipsilateral side bending and rotation

Bilateral —> Neck flexion

Longus coli

Unilateral —> Ipsilateral side bending and rotation

Bilateral —> Neck flexion

Suprahyoid

Mandible depression

Hyoid elevation

Digastric

Mandible depression

Mandible Retraction

Hyoid elevation

Infrahyoids

hyoid and thyroid depression