Structures

  • Depressor anguli oris
  • Depressor labii inferioris
  • Mentalis
  • Risorius
  • Zygomaticus minor
  • Levator labii superioris
  • Levator labii superioris alaeque nasi
  • Levator anguli oris
  • Orbicularis oris

MuscleActionOriginInsertionInnervationBlood supply
Depressor anguli oris- Pulls corner of mouth inferior and laterally- Oblique line of mandible below canine
- Premolar and first molar teeth
- Skin at the corner of mouth
- Blends with orbicularis oris
- Facial nerve: (cranial nerve VII)- Facial artery
Depressor labii inferioris- Pulls lower lip inferiorly and laterally- Anterior part of oblique line of mandible- Lower lip at midline
- Blends with muscle from opposite side
- Facial nerve: (cranial nerve VII)- Facial artery
Mentalis- Raises and protrudes lower lip - Mandible inferior to incisor teeth- Skin of chin- Facial nerve: (cranial nerve VII)- Facial artery
- Transverse facial artery
Risorius- Retracts corner of mouth- Fascia over masseter muscle- Skin at the corner of the mouth- Facial nerve: (cranial nerve VII)- Facial artery
- Transverse facial artery
Zygomaticus major- Pulls the corner of the mouth superior and laterally- Posterior part of lateral surface of zygomatic bone- Skin at the corner of the mouth- Facial nerve: (cranial nerve VII)- Facial artery
- Transverse facial artery
Zygomaticus minor- Pulls the upper lip upward- Anterior part of lateral zygomatic bone- Upper lip medial to corner of mouth- Facial nerve: (cranial nerve VII)- Facial artery
- Transverse facial artery
Levator labii superioris- Raises upper lip
- Assists in forming nasolabial fold
- Infra-orbital margin of maxilla- Skin of Superolateral half of upper lip- Facial nerve: (cranial nerve VII)- Facial artery
Levator labii superioris alaeque nasi- Raises upper lip
- Opens nostril
- Frontal process of maxilla- Alar cartilage of nose
- Upper lip
- Facial nerve: (cranial nerve VII)- Facial artery
Levator anguli oris- Raises corner of mouth
- Assists in forming nasolabial fold
- Maxilla below infra-orbital foramen- Skin at the corner of mouth- Facial nerve: (cranial nerve VII)- Facial artery
Orbicularis oris- Closes lips
- Protrudes lips
- From muscles of the cheek
- Maxilla
- Mandible
- Forms ellipse around mouth- Facial nerve: (cranial nerve VII)- Facial artery