ACTIVITY 1
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Platysma (tenses the neck)
Origin - Fascia of deltoid and pectoralis major
Insertion - Skin and muscle around the lower face and angle of mouth; lower region of the mandible
Action - Elevation of mouth and lowers the mandible -
Mentalis (pouting)
Origin - Incisive fossa of mandible
Insertion - Lower jaw (mandible) and each side of the frenulum (lower lips); skin of the chin
Action - Protrude the lower lip and raises the skin of the chin -
Orbicularis Oris (kissing)
Origin - Maxilla and mandible
Insertion - Skin and muscle around the mouth
Action - Projects the lips outwards (closes), compresses against the teeth, and shapes during communication
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Corrugator Supercilii (frowning)
Origin - Medial end of the superciliary arch of frontal bone, cranially to the root of the nose
Insertion - The eyebrow’s skin above the middle part of the supraorbital margin.
Action - Draws the eyebrows together medially; wrinkling of the nose bridge
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Orbicularis Oculi (winking)
Origin - Frontal and maxillary bones; Lacrimal bone
Insertion - Tissue around eyelids (upper and lower)
Action - Closes the eye (blinking or squinting)
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Occipitofrontalis - frontal belly (lifting eyebrows)
Origin - Epicranial aponeurosis (Galea aponeurotica) and Occipital bone
Insertion - Skin superior to supraorbital margin
Action - Raising eyebrows and wrinkle the forehead
References:
Head and neck: Anatomy study course. Kenhub. (n.d.). https://www.kenhub.com/en/start/head-neck#head
Tortora, G. J. (2018, May 15). Principles of anatomy and physiology. Google Books. https://books.google.com/books/about/Principles_of_Anatomy_and_Physiology.html?id=aSaVDwAAQBAJ