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25 Cards in this Set
- Front
- Back
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Stylohyoid origin and insertion
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origin: Styloid process of temporal bone; insertion: Hyoid bone
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Mylohyoid action
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Elevates hyoid bone and floor of mouth, enabling tongue to exert backward and upward pressure that forces food bolus into pharynx
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Mylohyoid innervation
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Mandibular branch of trigeminal nerve
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Digastric origin and insertion
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origin: Lower margin of mandible (anterior belly) and mastoid process of the temporal bone (posterior belly); insertion: By a connective tissue loop to hyoid bone
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Stylohyoid action
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Elevates and retracts hyoid, thereby elongating floor of mouth during swallowing
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Stylohyoid innervation
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Facial nerve
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Styloglossus origin and insertion
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origin: Styloid process of temporal bone; insertion: Lateral inferior aspect of tongue
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Digastric action
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Acting in concert, the digastric muscles elevate hyoid bone and steady it during swallowing and speech; acting from behind, they open mouth (prime mover) and depress mandible
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Digastric innervation
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Mandibular branch of trigeminal nerve for anterior belly; Facial nerve for posterior belly
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Hyoglossus origin and insertion
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origin: Body and greater horn of hyoid bone; insertion: Inferolateral tongue
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Styloglossus action
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Retracts (and elevates) tongue
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Styloglossus innervation
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Hypoglossal nerve
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Genioglossus origin and insertion
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origin: Internal surface of mandible near symphysis; insertion: Inferior aspect of the tongue and body of hyoid bone
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Hyoglossus action
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Depresses tongue and draws its sides downward
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Hyoglossus innervation
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Hypoglossal nerve
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Buccinator origin and insertion
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origin: Molar region of maxilla and mandible; insertion: Orbicularis oris
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Genioglossus action
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Primarily protrudes tongue, but can depress or act in concert with other extrinsic muscles to retract tongue
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Genioglossus innervation
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Hypoglossal nerve
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Lateral Pterygoid origin and insertion
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origin: Greater wing and lateral pterygoid plate of sphenoid bone; insertion: Condyle of mandible and capsule of temporomandibular joint
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Buccinator action
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Draws corner of mouth laterally; compresses cheek (as in whistling and sucking); holds food between teeth during chewing; well developed during nursing infants
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Buccinator innervation
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Facial nerve
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Medial Pterygoid origin and insertion
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origin: Medial surface of lateral pterygoid plate of sphenoid bone, maxilla, and palatine bone; insertion: Medial surface of mandible near its angle
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Lateral Pterygoid action
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Protrudes mandible (pulls it anteriorly); provides forward sliding and side-to-side grinding movements of the lower teeth
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Lateral Pterygoid innervation
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Trigeminal nerve
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Temporalis origin and insertion
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origin: Temporal fossa; insertion: Coronoid process of mandible via a tendon that passes beneath zygomatic arch
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