Head/Neck/Face innervation and action

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limadams87
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75189
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Head/Neck/Face innervation and action
Updated:
2011-03-31 21:00:09
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anatomy
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Head/Neck/Face innervation and action
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  1. Occipitals
    Innervation: CN VII (facia-posterior auricular branchl)

    Action: pulls scalp back
  2. Frontalis
    Innervation: CN VII (facial-temporal branch)

    Action: raises eyebrows, wrinkles forehead; surprise, fright, horror
  3. Orbicularis Oculis
    Innervation: CN VII (facial - temporal and zygomatic branches)

    Action: closes lids; winking, blinking, sleeping
  4. Corrugator Supercilii
    Innervation: CN VII (facial - temporal branch)

    Action: draws eyebrows together; frown
  5. Procerus
    Innervation: CN VII (facial-buccal branches)

    Action: pull skin of nose upward; wrinkles on bridge of nose
  6. Nasalis
    Innervation: CN VII (facial - buccal branches)

    Action: transverse part(compressor naris) compresses nostrils, alar part(dilator naris) dilates nostrils
  7. Depressor Septi
    Innervation: CN VII (facial - buccal branches)

    Action: assists dilator naris
  8. Levator Labii Superioris Alaeque Nasi
    Innervation: CN VII (facial - buccal branches)

    Action: raise and evert upper lip and corner of mouth; sneering, snarling
  9. Levator Labii Superioris
    Innervation: CN VII (facial - buccal branches)

    Action: raise and evert upper lip and corner of mouth; sneering, snarling
  10. Levator Anguli Oris
    Innervation: CN VII (facial - buccal branches)

    Action: raise and evert upper lip and corner of mouth; sneering, snarling
  11. Risorius
    Innervation: CN VII (facial - buccal branches)

    Action: Retract and raise the corner of the mouth; grinning, smiling, laughing
  12. Zygotmaticus Major
    Innervation: CN VII (facial - buccal branches)

    Action: Retract and raise the corner of the mouth; grinning, smiling, laughing
  13. Zygotmaticus Minor
    Innervation: CN VII (facial - buccal branches)

    Action: Retract and raise the corner of the mouth; grinning, smiling, laughing
  14. Depressor Labii Inferioris
    Innervation: CN VII (facial - mandibular branch)

    Action: depress the lower lip and corner of mouth; doubt, sadness
  15. Depressor Anguli Oris
    Innervation: CN VII (facial - mandibular branch)

    Action: depress the lower lip and corner of mouth; doubt, sadness
  16. Mentalis
    Innervation: CN VII (facial - mandibular branch and buccal branch)

    Action: depress the lower lip and corner of mouth; doubt, sadness. Also, protrudes and everts lower lip; pout.
  17. Orbicularis Oris
    Innervation: CN VII (facial - mandibular branch and buccal branch)

    Action: closes lips and purses; blowing
  18. Buccinator
    Innervation: CN VII (facial - buccal branch)

    Action: compresses cheek against teeth preventing food from accumulating in cheeks; blowing muscle
  19. Auricularis Anterior/Superior/Posterior
    Innervation: CN VII (facial - posterior auricular branch and temporal branch)

    Action: connect auricle to skull

    *note: several intrinsic ear muscles connect different parts of auricle but have very little function in man
  20. Platysma
    Innervation: CN VII (facial - cervical branch)

    Action: tightens skin on neck, draws down lower lip and corner of mouth producing a grimace. May assist in opening mouth.
  21. Superior Rectus
    Innervation: CN III (oculomotor)

    Action: Turns eye upward
  22. Inferior Rectus
    Innervation: CN III (oculomotor)

    Action: turns eye downward
  23. Medial Rectus
    Innervation: CN III (oculomotor)

    Action: turns eye medially
  24. Lateral Rectus
    Innervation: CN VI (abducens)

    Action: turns eye laterally
  25. Superior oblique
    Innervation: CN IV (trochlear)

    Action: turns eye downward and laterally
  26. Inferior oblique
    Innervation: CN III (oculomotor)

    Action: turns eye upward and laterally
  27. Levator palpebrae superioris
    Innervation: CN III (oculomotor)

    Action: raises upper lid. Antagonized by orbicularis oculi
  28. Genioglossus
    Innervation: CN XII (hypoglossal)

    Action: protrudes apex of tongue from mouth
  29. Hyoglossus
    Innervation: CN XII (hypoglossal)

    Action: depresses tongue
  30. Styloglossus
    Innervation: CN XII (hypoglossal)

    Action: draws tongue upwards and backwards
  31. Superior longitudinal, inferior longitudinal, transverse, vertical fibers of tongue
    Innervation: CN XII (hypoglossal)

    Action: alter shape of tongue
  32. Trapezius
    Innervation: CN XI (accessory) and ventral rami C2, 3, 4

    Action: upper-elevate, retract, rotate scapula upward. Extend, side bend head to same side and rotate opposite. Middle-retract scapula. Lower-retract, depress, rotate scapula upward
  33. Sternoclediomastoid
    Innervation: CN XI (accessory) and ventral rami C2, 3, 4

    Action: bilaterally-extend head at A-O joints, flex neck. Unilaterally-side bend head and neck to same side. Rotate opposite.
  34. Digastric
    Innervation: Posterior belly-CN VII(facial). Anterior belly-mandibular division of trigeminal CN V (V3), mylohyoid branch of inferior alveolar nerve

    Action: swallowing-elevates hyoid and with it the base of the tongue and larynx. Fixed hyoid-depresses mandible.
  35. Stylohyoid
    Innervation: CN VII(facial).

    Action: swallowing-elevates hyoid and with it the base of the tongue and larynx. Fixed hyoid-depresses mandible.
  36. Mylohyoid
    Innervation: mandibular division of trigeminal CN V (V3), mylohyoid branch of inferior alveolar nerve

    Action: swallowing-elevates hyoid and with it the base of the tongue and larynx. Fixed hyoid-depresses mandible.
  37. Geniohyoid
    Innervation: branch of ventral ramus of C1

    Action: swallowing-elevates hyoid and with it the base of the tongue and larynx. Fixed hyoid-depresses mandible.
  38. Sternohyoid
    Innervation: Ansa cervicalis

    Action: swallowing-depresses hyoid and larynx after they have been elevated by suprahyoid muscles.
  39. Omohyoid
    Innervation: Ansa cervicalis

    Action: swallowing-depresses hyoid and larynx after they have been elevated by suprahyoid muscles.
  40. Sternothyroid
    Innervation: Ansa cervicalis

    Action: swallowing-depresses hyoid and larynx after they have been elevated by suprahyoid muscles.
  41. Thryohyoid
    Innervation: Ansa cervicalis

    Action: swallowing-depresses hyoid and larynx after they have been elevated by suprahyoid muscles.
  42. Longus colli
    Innervation: ventral rami C2-C6

    Action: bilaterally-Flexes neck. Unilaterally-side bends neck to same side and rotates to opposite side by pulling transverse processes forward.
  43. Longus capitis
    Innervation: ventral rami C1-C3

    Action: bilaterally-Flexes head and neck. Unilaterally-side bends and rotates head and neck to same side by pulling occiput backwards
  44. Rectus capitis anterior
    Innervation: ventral rami C1-C2

    Action: flexes head at A-O joints
  45. Rectus capitis lateralis
    Innervation: ventral rami C1-C2

    Action: side bends head to same side
  46. Scalenus Anterior/Medius/Posterior
    Innervation: ventral rami C3-8

    Action: acting from below with fixed ribs-flex cervical spine, side bend to same side, rotate to same side. Acting from above with fixed cervical spine-elevate upper 2 ribs during inspiration
  47. Masseter
    Innervation: trigeminal CN 5, mandibular division (V3)

    Action: elevates mandible, closing mouth
  48. Temporalis
    Innervation: trigeminal CN 5, mandibular division (V3)

    Action: anterior fibers-elevate mandible. Posterior fibers-retract mandible
  49. Lateral pterygoid
    Innervation: trigeminal CN 5, mandibular division (V3)

    Action: both heads draw mandible toward OPPOSITE side producing side to side grinding movements. Upper head-elevates mandible. Lower head-protrudes and depresses mandible, opening mouth
  50. Medial pterygoid
    Innervation: trigeminal CN 5, mandibular division (V3)

    Action: draws mandible toward OPPOSITE side. Protrudes and elevates mandible

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