ACTIVITY 1
Name the muscle that may cause the following facial expression and write down its origin, insertion and action.
|
Name of Muscle |
Origin |
Insertion |
Action |
|
|
1. |
Platysma |
Fascia of the neck |
Inferior border of of the lower mandible |
Pulling of lower lip/mandible side and down; tensing of the skin of anterior neck |
|
2. |
Mentalis |
Mandible |
Underneath the skin of chin |
Protrusion of lower lip |
|
3. |
Orbicularis oris |
Tissue surrounding the lips |
Underneath the skin at the corners of the mouth |
Shaping of lips |
|
4. |
Corrugator supercilii |
Frontal bone |
Skin underneath the eyebrow |
Lowering eyebrows (Scowling), causing vertical wrinkles above the nose |
|
5. |
Orbicularis oculi |
Medial bones composing the orbit of the eye |
Circumference of the orbit of the eye |
Closing of eyelids |
|
6. |
Occipitofrontalis (frontal belly) |
Epicranial aponeurosis |
Underneath the skin of the forehead |
Elevation of eyebrows, causing wrinkles on the forehead skin |