Hyoid Muscles

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Author:
elg04c
ID:
48842
Filename:
Hyoid Muscles
Updated:
2010-12-05 15:40:09
Tags:
infrahyoid muscles suprahyoid muscles
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Description:
Attachments, innervation and actions of infrahyoid muscles and suprahyoid muscles
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  1. What are the infrahyoid muscles?
    • Sternohyoid
    • Omohyoid
    • Sternothyroid
    • Thyrohyoid
  2. Attachments of sternohyoid muscle
    • Manubrium and medial end of clavicle
    • Body of hyoid bone
  3. Innervation of sternohyoid muscle
    C1-C3 by a branch of ansa cervicalis
  4. Action of sternohyoid muscle
    Depresses hyoid bone after it has been elevated during swallowing
  5. Attachment of omohyoid muscle
    • Superior border of scapula near suprascapular notch
    • Inferior border of hyoid bone
  6. Innervation of omohyoid muscle
    C1-C3 by a branch of ansa cervicalis
  7. Action of omohyoid muscle
    Depresses, retracts and steadies hyoid bone
  8. Attachments of sternothyroid muscle
    • Posterior surface of manubrium
    • Oblique line of thyroid cartilage
  9. Innervation of sternothyroid muscle
    C2 and C3 by a branch of ansa cervicalis
  10. Actions of sternothyroid muscle
    Depresses hyoid bone and larynx
  11. Attachments of thyrohyoid muscle
    • Oblique line of thyroid cartilage
    • Inferior border of body and greater horn of hyoid bone
  12. Innervation of thyrohyoid muscle
    C1 via the hypoglossal nerve
  13. Action of thyrohyoid muscle
    Depresses hyoid bone and elevates larynx
  14. What are the suprahyoid muscles?
    • Diagastric muscle
    • Stylohyoid muscle
    • Mylohyoid muscle
    • Geniohyoid muscle
  15. Attachment of Posterior belly of diagastric muscle
    • Mastoid notch (medial to mastoid process) of temporal bone
    • Body of hyoid bone (via intermediate tendon with a fibrous loop)
  16. Attachment of anterior belly of diagastric muscle
    • Diagastric fossa of mandible
    • Body of hyoid bone (via intermediate tendon with a fibrous loop)
  17. Innervation of posterior belly of diagastric muscle
    Facial nerve
  18. Innervation of anterior belly of diagastric muscle
    Mylohyoid nerve (from CN V3)
  19. Actions of diagastric muscle
    Elevates hyoid bone (during swallowing) and assists in opening mandible
  20. Attachments of stylohyoid muscle
    • Styloid process of temporal bone
    • body of hyoid bone (via a split tendon)
  21. Innervation of stylohyoid muscle
    Facial nerve
  22. Actions of stylohyoid muscle
    Elevates hyoid bone during swallowing and assists in opening mandible
  23. Attachments of mylohyoid muscle
    • Mylohyoid line on mandible
    • Body of hyoid bone (via median tendon of insertion- mylohyoid raphe)
  24. Innervation of mylohyoid muscle
    Mylohyoid nerve (from CN V3)
  25. Actions of mylohyoid muscle
    Tightens and elevates oral floor, draws hyoid bone forward (swallowing), assists in opening mandible and moving it to the side (mastication)
  26. Attachments of geniohyoid muscle
    • Inferior mental spine of mandible
    • Body of hyoid bone
  27. Innervation of geniohyoid muscle
    Anterior ramus of C1 (via hypoglossal nerve)
  28. Actions of geniohyoid muscle
    Draws hyoid bone forward (swallowing) and assists in opening the mandible

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