Lesson objectives To name the main facial muscles

Lesson objectives • To name the main facial muscles • To label a diagram of the main facial muscles • To describe the actions of the main facial muscles

Muscles of the Head and Face • • • Frontalis - head Temporalis - head Orbicularis Oculi – eye Corrugator - eyebrow Orbicularis Oris - mouth Risorius - mouth Zygomaticus – cheek Buccinator – cheek Levator Labitis (Labii) - Side of nose

Muscles of the Face and Neck • • • Masseter - jaw Mentalis – jaw Depressor Labii - lip Sternocleidomastoid - neck Platysma – neck

Frontalis Muscle • Origin – galea aponeurotica • Insertion – skin of the eyebrow and nose • Action – Raises eyebrows, wrinkles forehead, shows a state of surprise

Frontalis Muscle

Temporalis Muscle • Origin – Parietal bone • Insertion – coronoid process of the mandible • Action – raises mandible, elevates and retracts the lower jaw

Temporalis Muscle

Orbicularis Oculi Muscle • Origin – Frontal bone and Lacrimal bone • Insertion – Eyelids • Action – Closes the eye and causes blinking

Orbicularis Oculi Muscle

Corrugator Muscle • Origin – Bony ridge located above eye • Insertion – deep surface of the skin, above the middle of the orbital arch • Action – Draws eyebrow downwards and medially, producing wrinkles of the forehead and frowning

Corrugator Muscle

Orbicularis Oris Muscle • Origin – Fibres derived from other facial muscles e. g. buccinator muscle • Insertion – Into the lips • Action – Closes the mouth and puckers the lips, ready for kissing

Orbicularis Oris Muscle

Risorius Muscle • Origin – Fascia over parotid gland • Insertion – Skin at the angle of the mouth • Action – Retracts the angle of the mouth to produce a smile

Risorius Muscle

Zygomaticus Muscle • Origin – Anterior of the zygomatic arch (cheekbone) • Insertion – Corner of mouth • Action – Smiling and laughing

Zygomaticus Muscle

Buccinator Muscle • Origin – Maxilla and mandible • Insertion – Angle of the mouth • Action – Pulls back angle of mouth and flattens cheek area, aiding chewing; also involved in sucking and blowing

Buccinator Muscle

Levator Labitis Muscle • Action – lifts the upper lip (expressing sadness) and helps the nasolabial fold

Levator Labitis Muscle

Masseter Muscle • Origin – Zygomatic arch and maxilla • Insertion – mandible • Action – raising mandible during chewing and clenches the teeth

Masseter Muscle

Mentalis Muscle • Action – Wrinkling of the chin skin, as used in expressions of doubt or displeasure • Known as the ‘pouting muscle’

Mentalis Muscle

Mentalis Muscle

Depressor Labii Muscle • Action – Lowers the bottom lip and draws it slightly to one side

Depressor Labii Muscle

Sternocleidomastoid Muscle • Action – Rotates the head to the opposite side; flexion of head and a nodding movement

Sternocleidomastoid Muscle

Platysma Muscle • Action – Wrinkling of the skin in the neck; depresses the lower jaw; and also draws down the lower lip and angle of the mouth as in yawning

Platysma Muscle

Video Clip on Facial Muscles https: //www. youtube. com/watch? v=Xmz 3 o. Lrnz. Bw