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Hyoid Muscles
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What are the infrahyoid muscles?
Sternohyoid
Omohyoid
Sternothyroid
Thyrohyoid
Attachments of sternohyoid muscle
Manubrium and medial end of clavicle
Body of hyoid bone
Innervation of sternohyoid muscle
C1-C3 by a branch of ansa cervicalis
Action of sternohyoid muscle
Depresses hyoid bone after it has been elevated during swallowing
Attachment of omohyoid muscle
Superior border of scapula near suprascapular notch
Inferior border of hyoid bone
Innervation of omohyoid muscle
C1-C3 by a branch of ansa cervicalis
Action of omohyoid muscle
Depresses, retracts and steadies hyoid bone
Attachments of sternothyroid muscle
Posterior surface of manubrium
Oblique line of thyroid cartilage
Innervation of sternothyroid muscle
C2 and C3 by a branch of ansa cervicalis
Actions of sternothyroid muscle
Depresses hyoid bone and larynx
Attachments of thyrohyoid muscle
Oblique line of thyroid cartilage
Inferior border of body and greater horn of hyoid bone
Innervation of thyrohyoid muscle
C1 via the hypoglossal nerve
Action of thyrohyoid muscle
Depresses hyoid bone and elevates larynx
What are the suprahyoid muscles?
Diagastric muscle
Stylohyoid muscle
Mylohyoid muscle
Geniohyoid muscle
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)
Attachment of anterior belly of diagastric muscle
Diagastric fossa of mandible
Body of hyoid bone (via intermediate tendon with a fibrous loop)
Innervation of posterior belly of diagastric muscle
Facial nerve
Innervation of anterior belly of diagastric muscle
Mylohyoid nerve (from CN V3)
Actions of diagastric muscle
Elevates hyoid bone (during swallowing) and assists in opening mandible
Attachments of stylohyoid muscle
Styloid process of temporal bone
body of hyoid bone (via a split tendon)
Innervation of stylohyoid muscle
Facial nerve
Actions of stylohyoid muscle
Elevates hyoid bone during swallowing and assists in opening mandible
Attachments of mylohyoid muscle
Mylohyoid line on mandible
Body of hyoid bone (via median tendon of insertion- mylohyoid raphe)
Innervation of mylohyoid muscle
Mylohyoid nerve (from CN V3)
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)
Attachments of geniohyoid muscle
Inferior mental spine of mandible
Body of hyoid bone
Innervation of geniohyoid muscle
Anterior ramus of C1 (via hypoglossal nerve)
Actions of geniohyoid muscle
Draws hyoid bone forward (swallowing) and assists in opening the mandible
Author
elg04c
ID
48842
Card Set
Hyoid Muscles
Description
Attachments, innervation and actions of infrahyoid muscles and suprahyoid muscles
Updated
2010-12-05T20:40:09Z
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