Muscles of CN

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Author:
embryo
ID:
97274
Filename:
Muscles of CN
Updated:
2011-08-16 21:22:00
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muscles
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Description:
MS1/Mod 1: gross anatomy and embryology, functions of muscles of cranial nerve innervations
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  1. Muscles of mastication
    • adduction and lateral motion of jaw, includes:
    • 1. masseter
    • 2. temporalis
    • 3. medial pterygoid
    • 4. lateral pterygoid
  2. Mylohyoid
    runs from mandible to hyoid bone; used in swallowing and speaking
  3. Posterior and anterior bellies of digastric
    from mastoid process to symphisi menti
  4. Tensor veli palatini
    tenses soft palate and aids in prevention of food into nasopharynx during swallowing
  5. Tensor tympani
    dampens sounds
  6. Superior oblique
    abducts, depresses, and internally rotates eye
  7. Lateral rectus
    abduction, brings pupil away from midline
  8. Lacrimal gland
    secrete tear film
  9. Nasal gland
    moisturize nasal mucosa
  10. Submandibular gland
    salivary glands beneath floor of mouth, superior to digastric muscles
  11. Sublingual glands
    salivary glands beneath tongue, anterior to submandibular
  12. Stylohyoid
    styloid process to hyoid bone, anterior to posterior belly of digastric (hence facial nerve also innervating posterior belly of digastric)
  13. Stapedius
    smst m (1mm), stabilizes stapes and dampens vibrations
  14. Parotid gland
    lgst of salivary glands, wraps around mandibular ramus
  15. Stylopharyngous
    elevates larynx and pharynx, dilates pharynx to permit passage of lg food bolus-aids in swallowing
  16. Trapezius
    moves scapula and supports arm
  17. Sternocleidomastoid
    flexes and rotates head
  18. Glossus
    • all extrinsic muscles of tongue, change position of tongue and are attached to bone (except palatoglossus):
    • 1. genioglossus
    • 2. hyoglossus
    • 3. styloglossus
  19. Intrinsic muscles of tongue
    • change shape of tongue, not attached to bone
    • 1. superior longitudinal
    • 2. inferior longitudinal
    • 3. verticalis
    • 4. transversus

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