Facial Muscles 11: Shaping Bones, Boosting Looks stats, and Managing Disorders
By The autistic mf, @Histy
By The autistic mf, @Histy
- The Foundation: Facial Muscle Overview
- Detailed Breakdown of Every Facial Muscle
- Scalp and Forehead Group
- Orbital and Eye Group
- Nasal Group
- Mouth and Lip Group
- Mastication and Jaw Group
- Neck and Ear Group
The human face boasts approximately 40-50 muscles (bilaterally), categorized into mastication (chewing) and mimetic (expression) groups. Mastication muscles, such as the masseter and temporalis, originate from robust cranial bones and insert on the mandible, exerting forces up to 700 Newtons during biting—enough to remodel bone density over time. Mimetic muscles, conversely, anchor from bones to skin, enabling nuanced emotions but with subtler osseous impacts. Innervation primarily stems from the facial nerve (CN VII) for expressions, branching into temporal, zygomatic, buccal, marginal mandibular, and cervical segments, while mastication relies on the trigeminal nerve's mandibular division (CN V3). Vascular supply draws from the external carotid's branches: facial, maxillary, superficial temporal, and transverse facial arteries, ensuring nutrient delivery for sustained activity.
- Occipitofrontalis (Epicranius): Originates at the occipital bone and galea aponeurotica; inserts into the forehead skin and brows. Action: Elevates brows (frontalis belly) and retracts scalp (occipitalis). Innervated by CN VII (temporal for frontalis, posterior auricular for occipitalis); supplied by the superficial temporal artery. Remodeling: Pulls on frontal/occipital bones, potentially increasing density for a lifted brow line, enhancing upper face harmony in PSL by reducing hooding.
- Frontalis: As the frontal belly, it originates from the galea and inserts into the brow skin. Creates horizontal wrinkles; same innervation and supply. Overuse forms lines, but targeted exercises subtly elevate the frontal bone for an alert appearance.
- Occipitalis: Origin at the superior nuchal line; inserts into the galea. Retracts scalp; minimal direct bone impact but supports overall tension.
- Temporoparietalis: Origin temporoparietal fascia; inserts auricle/scalp. Tenses the scalp and elevates the ears; CN VII; posterior superficial temporal blood. Vestigial, with minor temporal bone pull for lateral symmetry.
- Orbicularis Oculi: Origin medial orbital margin and lacrimal bone; inserts into the orbital skin and tarsal plates. Closes eyelids (gentle palpebral, forceful orbital); CN VII (temporal/zygomatic); supraorbital/supratrochlear arteries. Remodeling: Squinting stresses orbital rims; chronic activity may cause resorption if unbalanced, but proper tone defines sockets for "hunter eyes" in aesthetic evaluations.
- Corrugator Supercilli: Origin medial frontal bone; inserts brow skin. Draws brows medially for frowns; CN VII temporal; same arteries. Tension on the frontal bone; Botox relaxation smooths glabellar lines for midface balance.
- Depressor Supercilli: Originates from the frontal bone; inserts into the brow skin. Depresses brows; similar setup. Aids in expression without major reshaping.
- Procerus: Origin of the nasal bone; it inserts into the glabellar skin. Wrinkles nose bridge; CN VII frontal; supraorbital supply. Pulls nasal bones, subtly contouring for refined harmony.
- Nasalis: Origin maxilla/nasal bones; inserts ala/cartilage/skin. Compresses/flares nostrils (transverse/alar); CN VII zygomatic; transverse facial artery. Maxillary pull may widen the base, supporting midface projection.
- Depressor Septi Nasi: Origin maxilla; inserts septum. Pulls the tip down; CN VII; superior labial blood. Overactivity droops nose, disrupting PSL profile—management lifts for upward appeal.
- Dilator Naris: Origin maxilla: inserts ala. Flares nostrils; same as nasalis. Enhances nasal contours via bone stress.
- Levator Labii Superioris Alaeque Nasi: Origin from the frontal maxilla; inserts into the lip/nasal skin. Lifts lip and nostril; CN VII buccal; superior labial. Maxillary remodeling for elevated midface.
- Levator Labii Superioris: Origin maxilla/zygomatic; inserts upper lip. Elevates lip; same. Zygomatic pull sharpens cheeks.
- Levator Anguli Oris: Origin maxilla (canine fossa); inserts modiolus. Raises the mouth corner; buccal CN VII; perioral branches. Counters sagging for the youthful lower third.
- Zygomaticus Minor: Origin zygomatic; inserts into the upper lip. Subtle lip lift; transverse facial blood. Strengthens the zygoma for hollows.
- Zygomaticus Major: Origin zygomatic; inserts modiolus. Major smiler; same. Key for cheek definition via bone remodeling.
- Risorius: Origin parotid fascia; inserts modiolus. Lateral pull; buccal CN VII; inferior labial. Supports lip symmetry.
- Orbicularis Oris: Origin maxilla/mandible; inserts into the lip submucosa. Puckers/closes; buccal/marginal mandibular CN VII; labial arteries. Influences chin/jaw projection.
- Depressor Anguli Oris: Origin mandible; inserts modiolus. Lowers corner; marginal mandibular; inferior labial. Shapes mandibular edges; overuse causes downturned mouths.
- Depressor Labii Inferioris: Origin mandible; inserts into the lower lip. Depresses lip; same. Pouting force on bone.
- Mentalis: Origin mandible; inserts chin skin. Protrudes lip/wrinkles chin; marginal mandibular; inferior labial. Enhances chin definition.
- Buccinator: Origin maxilla/mandible; inserts modiolus/cheek. Presses cheeks; buccal CN VII; pterygoid/transverse. Aids midface via jaw force.
- Masseter: Origin zygomatic arch; inserts mandibular angle/ramus. Powerful closure; CN V3; maxillary branches. Bulks the jaw; chewing thickens for square masculine lines.
- Temporalis: Origin temporal fossa (frontal/parietal/sphenoid); inserts coronoid. Elevates/retracts; CN V3 deep temporal; deep temporal blood. Crucial for gonial angle: strong pull tallens ramus, sharpening to 120-130° ideal; weak diets obtuse it, per evolutionary studies.
- Medial Pterygoid: Origin sphenoid/palatine/maxilla; inserts ramus/angle. Closes/protrudes; CN V3; pterygoid. Bolsters lower contours.
- Lateral Pterygoid: Origin sphenoid; inserts condyle/disc. Opens/protrudes; CN V3 anterior; pterygoid. Maintains TMJ symmetry.
- Mylohyoid: Origin mandibular inner; inserts hyoid/raphe. Elevates hyoid/opens jaw; CN V3 mylohyoid; submental/inferior alveolar. Subtle neck support.
- Anterior Digastric: Origin mandibular fossa: inserts hyoid. Depresses mandible; CN V3; submental. Aids lower harmony.
- Posterior Digastric: Origin mastoid: inserts hyoid. Elevates the hyoid; CN VII; occipital. Neck integration.
- Platysma: Origin chest fascia; inserts mandible/skin. Tenses neck/depresses lip; CN VII cervical; suprascapular/submental. Tones jaw-neck junction.
- Auricularis Anterior/Superior/Posterior: Originates from the temporal/mastoid; insert auricle. Pull/ elevate ears; CN VII; auricular arteries. Vestigial, minimal impact.
Thanks for reading this autistic article.
Feel free to ask any questions
Feel free to ask any questions
