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Stylohyoid
- Innervation: Facial Nerve [VII]
- Function: Pulls hyoid bone upward in a posterosuperior direction
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Digastric (anterior belly)
- Innervation: Mylohyoid nerve from inferior alveolar branch of mandibular nerve [V3]
- Function: opens mouth by lowering mandible, raises hyoid bone
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Digastric muscle (posterior belly)
- Innervation: Facial Nerve [VII]
- Function: Pulls hyoid bone upward and back
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Mylohyoid muscle
- Innervation: mylohyoid nerve from inferior alveolar branch of mandibular nerve [V3]
- Function: Support and elevation of floor of mouth, elevation of hyoid
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Geniohyoid muscle
- Innervation: Branch from anterior ramus of C1 (carried by hypoglossal nerve XII)
- Function: fixed mandible elevates and pulls hyoid bone forward; fixed hyoid pulls mandible downward and inward
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Sternohyoid muscle
- Innervation: anterior rami of C1 to C3 through ansa cervicalis
- Function: Depresses hyoid bone after swallowing
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Omohyoid muscle
- Innervation: Ant. rami of C1-C3
- Function: Depresses and fixes hyoid bone
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Thyrohyoid muscle
- Innervation: Fibers from anterior ramus of C1
- Function: Depresses hyoid bone, but when hyoid is fixed, raises larynx
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Sternothyroid muscle
- Innervation: ant. rami C1-C3
- Function: draws larynx downward
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Thyroid Gland
- Anterior neck right below the thyroid cartilage
- Deep to sternohyoid, sternothyroid, and omohyoid muscles
- Arterial Supply: Superior thyroid artery and inferior thyroid artery (branch of thyrocervical trunk off of the subclavian artery)
- Venous drainage: Superior thyroid vein and middle and inferior thyroid veins
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Multinodular Goiter
- Most common thyroid pathology
- Diffuse irregular enlargement of the thyroid gland with areas of thyroid hypertrophy and colloid cyst formation
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Submental Triangle
Contains: submental lymph nodes, tributaries forming anterior jugular vein
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Submandibular Triangle
Submandibular Gland, lymph, hypoglossal nerve, mylohyoid nerve, facial artery and vein
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Carotid Triangle
- Tributaries to the common facial vein
- Cervical branch of facial nerve
- common carotid
- whole bunch of other shit i'm too lazy to write
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Muscular Triangle
Sternohyoid, omohyoid, sternothyroid, thyrohyoid, thyroid and parathyroid glands, pharynx
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