N3 Anatomy and Physiology AY 2023-2024

1. Platysma

   1. Origin: Fascia of delta and pectoralis major

   2. Insertion: Connects to the jawbone

   3. Action:  Creates a downward lip motion 

2. Mentalis

   1. Origin: Incisive fossa

   2. Insertion: Dermis on the surface of the chin

   3. Action: Downward motion of lips, creating a wrinkly texture on the chin

3. Orbicularis oris

   1. Origin: Modiolus of mouth

   2. Insertion: Submucosa and Dermis of lips

   3. Action: Creates a kissing motion through protrusion

4. Corrugator Supercilii

   1. Origin: Supraorbital margin center

   2. Insertion: Dermis on the surface nearby the eyebrows

   3. Action: The eyebrows move closer to each other, creating a wrinkle effect pulling in the skin from the forehead in between the eyebrows

5. Orbicularis oculi

   1. Origin: Lacrimal bone

   2. Insertion: Surrounding eyelids

   3. Action: Squinting or blinking motion as the eyelids close

6. Occipitofrontalis

   1. Origin: Galea aponeurotica

   2. Insertion: Subcutaneous tissue of eyebrows

   3. Action: Eyebrows move upwards projecting lines on the forehead

Source/s: 

Tortora, G. J. (2018, May 15). Principles of anatomy and physiology. Google Books.