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Lab 10: Oral & nasal Cavities

105 flashcardsby Kai
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Geniohyoid muscle
Innervation: C1 fibers (which hitchhike along the hypoglossal nerve).

Action: Suspends the hyoid bone; Raises the hyoid during swallowing and tone production; Constitutes the floor of the oral cavity.

Origin: Inferior mental spine of the mandible

Insertion: Hyoid bone
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Hyoglossus muscle
Innervation: Hypoglossal nerve (CN XII)

Action: Retracts + depresses tongue

Origin: Hyoid bone

Insertion: Tongue
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Levator veli palatini muscle
Innervation: Vagus nerve (CN X)

Action: Elevates soft palate above neutral position to close nasopharynx

Origin: Temporal bone + auditory tube cartilage

Insertion: Soft palate
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Musculus uvulae (uvula)
Innervation: Vagus nerve (CN X)

Action: Elevates & retracts the uvula of the soft palate

Origin: Muscles of the soft palate

Insertion: Muscles of the soft palate
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Mylohyoid muscle
Innervation: Nerve to mylohyoid nerve (a branch of the inferior alveolar nerve from V3)

Action: Suspends the hyoid bone; Raises the hyoid during swallowing and tone production; Constitutes the floor of the oral cavity.

Origin: Mylohyoid line of mandible

Insertion: Hyoid bone
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Palatoglossus muscle
Innervation: Vagus nerve (CN X)

Action: Elevates the tongue and depresses the soft palate. It also helps to constrict the isthmus of the fauces

Origin: Soft palate

Insertion: Tongue
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Styloglossus muscle
Innervation: Hypoglossal nerve (CN XII)

Action: Retracts tongue and curls its sides

Origin: Styloid process

Insertion: Tongue
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Tensor veli palatini muscle
Innervation: CN V3 (mandibular nerve of trigeminal CN V)

Action: Tenses/widens soft palate to seal off nasopharynx using pterygoid hamulus as a pulley.

Origin: Sphenoid bone

Insertion: Soft palate
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