HK 4442 Presentation Content

·Orbicularis Oculi: Responsible for "crow’s feet" and eye involvement during a genuine smile.

·Origin: Medial orbital margin, and lacrimal bone

·Insertion: Skin around the margin of the orbit

·Levator Labii Superioris: Elevates the upper lip.

·Origin: Infraorbital region of the maxilla

·Insertion: Skin of the upper lip

·Zygomaticus Major and Minor: Elevate the corners of the mouth, creating the classic upward curve of a smile.

·Origin: lateral and posterior surface of the zygomatic bone

·Insertion: (zygomaticus major) skin at the corner of the mouth, (zygomaticus minor) upper lip – just medial to the corner of the mouth

·Levator Anguli Oris: Assists in lifting the corners of the mouth.

·Origin: Maxilla, below infraorbital foramen

·Insertion: Skin at the corner of the mouth

·Risorius: Pulls the corners of the mouth laterally for a broader smile.

·Origin: Fascia over masseter

·Insertion: Skin of the corner of the mouth

·Depressor Labii inferioris: Moves the lower lip downward to show the bottom teeth during smiling

·Origin: Mandible (anterior portion)

·Insertion: Lower lip at midline