Anatomy
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| What is the origin of the Digastric for the Surprahyoid muscle? | Poserior belly: mastoid notch of temporal bone
Anterior belly: digastric fossa of internal mandible
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| What is the insertion of the Digastric for the Surprahyoid muscle? | Body of hyoid: both bellies meet and attach by a pulley tendon
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| What is the action of the Digastric for the Surprahyoid muscle? | Elevation of the hyoid bone. Depression of the mandible. Stabalize the hyoid bone for infrahyoid action.
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| What is the innervation of the Digastric for the Surprahyoid muscle? | Poster belly: Facial nerve (CN Vll)
Anterior belly: trigemental nerve (CN V)
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| What is the origin of the Stylohyiod for the Suprahyoid muscle? | Styloid process of the temporal bone
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| What is the insertion of the Stylohyiod for the Suprahyoid muscle? | Lateral margin of the hyoid bone (base of greater horn)
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| What is the action of the Stylohyiod for the Suprahyoid muscle? | Elevation of hyoid bone (swalling). Stabalize hyoid bone for infrahyoid action.
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| What is the innervation of the Stylohyiod for the Suprahyoid muscle? | Facial nerve (CN Vll)
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| What is the origin of the Geniohyoid for the Suprahyoid muscle? | Inner surface of the mandible (mental spine)
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| What is the insertion of the Geniohyoid for the Suprahyoid muscle? | Body of hyoid (paired muscle seperated by the septum)
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| What is the action of the Geniohyoid for the Suprahyoid muscle? | Elevation of hyoid bone. Depresses the mandible (works with mylohyoid)
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| What is the innervation of the Geniohyoid for the Suprahyoid muscle? | Hypoglossal nerve (CN Xll)
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| What is the origin of the Mylohyoid for the Suprahyoid muscle? | Inner surface of the mandible (mylohyoid line)
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| What is the insertion of the Mylohyoid for the Suprahyoid muscle? | Body of hyoid (anterior surface)
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| What is the action of the Mylohyoid for the Suprahyoid muscle? | Elevation of the hyoid bone. Depresses the mandible when hyoid is fixed.
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| What is the innervation of the Mylohyoid for the Suprahyoid muscle? | Trigeminal nerve (CN V- mandibular division, V3.
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| What is the origin of the Thyrahyoid of the Infrahyoid muscle? | Thyroid cartilage (oblique line)
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| What is the insertion of the Thyrahyoid of the Infrahyoid muscle? | Body of hyoid bone
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| What is the action of the Thyrahyoid of the Infrahyoid muscle? | Depression of the hyoid bone. Elevation of thyroid cartilage (Larynx)
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| What is the innervation of the Thyrahyoid of the Infrahyoid muscle? | C1 (via CN Xll)
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| What is the origin of the Sternothyroid of the Infrahyoid muscle? | Manubrium of the sternum (posterior)
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| What is the insertion of the Sternothyroid of the Infrahyoid muscle? | Thyroid cartilage (oblique line)
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| What is the action of the Sternothyroid of the Infrahyoid muscle? | Depression of the thyroid cartilage.
Acts eccentrically with suprahyoid muscle to provide them with a stable base.
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| What is the innervation of the Sternothyroid of the Infrahyoid muscle? | Ansa cervicalis C1-C2-C3
(Loop of nerves part of cervical plexus)
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| What is the origin of the Sternohyoid of the Infrahyoid muscle? | Manubrium & sternoclavicular joint (posterior aspect of both)
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| What is the insertion of the Sternohyoid of the Infrahyoid muscle? | Body of hyoid
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| What is the action of the Sternohyoid of the Infrahyoid muscle? | Depression of the hyoid and larynx
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| What is the innervation of the Sternohyoid of the Infrahyoid muscle? | Ansa cervicalis C1- C2- C3
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| What is the origin of the Omohyoid of the Inrahyoid muscle? | Superior belly: Hyoid bone (lateral to sternohyoid)
Inferior belly: Superior scapular border
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| What is the insertion of the Omohyoid of the Inrahyoid muscle? | Clavicle- both bellies meet and are held loosely to the clavicle by a pulley tendon
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| What is the action of the Omohyoid of the Inrahyoid muscle? | Depression of hyoid bone and larynx
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| What is the innervation of the Omohyoid of the Inrahyoid muscle? | Ansa cervicalis C1- C2- C3
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