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Head & Neck Muscles

Head & Neck Muscles- Ch 28

TermDefinition
Protusion Both lateral pterygoid m.
Retrusion posterior/horizontal fibers of temporal m. & digastric m.
Lateral excursion One lateral pterygoid acting by itself
Elevation of mandible Medial pterygoid, masseter, & temporal m.
Depression of mandible inferior head of lateral pterygoid m. & hyiod m.
Suprahyoid muscles Digastric Mylohyoid Stylohyoid Geniohyoid
Infrahyoid muscles Sternothyroid Sternohyoid Omohyoid Thyrohyoid
Muscles of mastication: names Masseter Temporalis Medial pterygoid Lateral pterygoid
Muscles of mastication develop from 1st pharyngeal arch
Most powerful muscles of mastication masseter
Muscle of mastication with very wide origin temporalis
Muscles of mastication: Nerve and blood supply V3- Trigeminal nerve, mandibular division Maxillary artery from External Carotid a.
Masseter: OIA O: 2 areas on Zygomatic arch I: lateral angle of mandible A: elevate mandible
Temporalis: OIA O: Entire temporal fossa I: Coronoid process A: elevates mandible Posterior fibers only, then retrude mandible
Medial Pterygoid: OIA O:Larger: medial surface of lateral pterygoid plate & fossa + pyramidal process of palatine bone O: smaller: maxillary tuberosity I: medial side of ramus A:elevates mandible
Lateral Pterygoid:smaller, superior head: OIA O: greater wing of sphenoid I: notch of condyle A: only 1 = lateral excursion A: biting/power stroke A: guides to centric
Lateral Pterygoid: larger, inferior head: OIA O: lateral side of lateral pterygoid plate I: notch of condyle A: protudes and depresses mandible
Sternocleidomastoid: OIANB O: sternum & clavicle I: mastoid process A: tilts & rotates head N: XI cranial n. B: branch of external carotid a.
Trapezius: OIANB O: external occipital protuberance, spinous process of cervical & thoracic vertebrae I: scapula & clavicle A: adducts, elevates, rotates scapula N: II III IV cranial n. B: superficial transverse cervical a.
Muscles with two bellies Digastric m. & Omohyoid m.
Digastric: anterior belly: OIANB O: intermediate tendon I: digastric fossa on medial surface mandible midline A: retrudes mandible, elevates hyoid N: V3 B: maxillary a.
Digastric: posterior belly: OIANB O: mastoid notch of temporal bone I: intermediate tendon A: retrudes mandible, elevates hyoid N: VII facial n B: Maxillary a.
Mylohyoid: OIANB O: mylohyoid line I: hyoid bone A: depresses mandible & elevates hyoid N: V3 mylohyoid branch B: branch of inferior alveolar a.
Geniohyoid: OIANB O: inferior genial tubercle on lingual midline of mandible I: hyoid bone A: depresss mandible & elevates hyoid N: I cervical n. B: lingual a.
Stylohyoid: OIANB O: styloid process I: body of hyoid bone A: pulls hyoid up & back N: VII facial n. B: facial and occipital a.
Omohyoid: inferior belly: OIANB O: scapula I: intermediate tendon w/in sternocleidomastoid m. A: pullls hyoid down N: II III cervical n. B: lingual a. & superior thyroid a.
Omohyoid: superior belly: OIANB O: intermediate tendon w/in sternocleidomastoid m. I: hyoid bone A: pulls hyoid down N: II III cervical n. B: lingual a. & superior thyroid a.
Sternohyoid: OIANB O: sternum I: hyoid bone A: pulls hyoid down N: II III cervical n. B: lingual a. & superior thyroid a.
Sternothyroid: OIANB O: sternum I: oblique line of thyroid cartilage A: pulls larynx down N: II III cervical a. B: superior thyroid a.
Thyrohyoid: OIANB O: oblique line of thyroid cartilage I: hyoid bone A: lifts larynx & depresses hyoid N: I cervial n. B: superior thyroid a.
Created by: smllfry1401
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