HK 4442 Presentation Content

Orbicularis Oculi

Responsible for 'crow’s feet' and eye involvement during a genuine smile.

Orbicularis Oculi Attachments

O: medial orbital margin, and lacrimal bone.

I: skin around the margin of the orbit.

Levator Labii Superioris

Elevates the upper lip.

Levator Labii Superioris Attachments

O: infraorbital region of the maxilla.

I: skin of the upper lip.

Zygomaticus Major and Minor

Elevate the corners of the mouth, creating the classic upward curve of a smile.

Zygomaticus Major and Minor Attachments

O: lateral and posterior surface of the zygomatic bone.

I (major): skin at the corner of the mouth.

I (minor): upper lip, just medial to the corner of the mouth.

Levator Anguli Oris

Assists in lifting the corners of the mouth.

Levator Anguli Oris Attachments

O: maxilla, below infraorbital foramen.

I: skin at the corner of the mouth.

Risorius

Pulls the corners of the mouth laterally for a broader smile.

Risorius Attachments

O: fascia over masseter.

I: skin of the corner of the mouth.

Depressor Labii Inferioris

Moves the lower lip downward to show the bottom teeth during smiling.

Depressor Labii Inferioris Attachments

O: mandible (anterior portion).

I: lower lip at midline.