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Chapter 28
Muscles of Mastication, Hyoid muscles, sternocleiodmastoid, trapezius muscle
| Question | Answer |
|---|---|
| What are the four pairs muscles of mastication? | Masseter Muscle Temportal Muscle medial pterygoid muscle lateral pterygoid muscle |
| What are the four paired suprahyoid muscles? | Digastric mylohyoid geniohyoid stylohyoid |
| What are the four paired infrahyoid muscles? | omohyoid sternohyoid sternothyroid thyrohyoid |
| Nemonic for infrahyoid muscles | TOSS |
| Nemonic for suprahyoid muscles | My Gravy Spoon Darling |
| Nemonic for muscles of mastication | Mom Let Me Talk |
| Origin of Masseter muscle (superficial head) | Inferior border of zygomatic arch |
| origin of masseter muscle (deep head) | Medial surface of zygomatic arch and inferior border of zygomatic arch |
| Insertion of Masseter Muscle | lateral side along lower border of the angle of the mandible |
| Function of the Masseter Muscle | contraction elevates mandible |
| Origin of temporal muscle | Temporal Fossa |
| Temporal Muscles insertion (anterior fibers/ vertical) | coronoid process of manible and anterior border of ramus all the way to the third molar |
| Function of the temporal muscle (anterior) | contraction of both fibers= elevates mandible |
| Function of temporal muscle (posterior fibers/horizontal) | contraction of only posterior fibers+ retrusion of manible |
| Origin of Medial pterygoid muscle | pterygoid foss along the medial surface of the lateral pterygoid plate of the sphenoid bone |
| origin of lateral pterygoid (superior head/small) | infratemporal crest of the greater wing of the sphenoid bone |
| insertion of medial pterygoid muscle | medial surface of angle of mandible |
| insertion of lateral pterygoid (superior head/small) | anterior surface of the neck of the mandibular condyle as well as the articular disc of the TMJ |
| Function of the medial pterygoid muscle | contraction elevates and protrudes the mandible |
| function of the lateral pterygoid muscle (superior head/small) | during biting; pulls the articular disc of the TMJ and the condyle posterior back to the "centric position" |
| Origin of the lateral pterygoid (inferior head/large) | Lateral surface of the lateral pterygoid plate of the sphenoid bone |
| Insertion of the lateral pterygoid (inferior head/large) | anterior surface of the neck of the mandibular condyle |
| Function of lateral pterygoid (inferior head/large_ | Contraction of both R &L = protrusion and depression/ opening of mandible R-Inferior head contracts = lateral excursion to Left side occurs L-Inferior head contracts = lateral excursion to Right side occurs |
| What artery is the blood supply for the muscles of mastication | maxillary |
| What is the branch blood supply of the masseter muscle | masseteric artery |
| What is the branch blood supply for the temporal muscle | anterior and posterior deep temporal arteries |
| What is the branch blood supply for the medial pterygoid and lateral pterygoid muscles | pterygoid artery branches |
| What is the main innervation of the muscles of mastication? | Cranial nerve V (5) |
| Origin of Digastric Muscle | digastric notch of mastoid process of temporal bone |
| insertion of digastric muscle | digastric fossa |
| function of digastric muscle | retrusion of mandible, assists with mandibular depression |
| origin of mylohyoid muscle | mylohyoid line |
| insertion of mylohyoid muscle | hyoid bone |
| function of mylohyoid muscle and geniohyoid muscle | depression of mandible, elevation of hyoid bone |
| origin of geniohyoid muscle | inferior genial tubericles of mandible |
| insertion of geniohyoid muscle and stylohyoid muscle | hyoid bone |
| Origin of stylohyoid muscle | styloid process |
| Function of stylohyoid muscle | pulls hyoid bone back and up |
| Innervation of Geniohyoid Muscle | 1st cervical nerve in the neck |
| Innervation of mylohyoid muscle | Mylohyoid nerve branch off the mandibular branch (v3 of the V cranial nerve (trigeminal) |
| Innervation of Digastric Muscle (anterior belly) | V3 of V cranial nerve (mandibular branch) |
| Innervation of Digastric Muscle (posterior belly) | facial nerve (cranial nerve VII) |
| Origin of omohyoid muscle | scapula |
| Insertion of omohyoid , sternohyoid, thyrohyoid muscles | hyoid bone |
| Function of omohyoid and sternohyoid muscles | pulls hyoid bone down |
| origin of sternohyoid muscle | sternum |
| origin of thyrohyoid muscle | oblique line of thyroid cartilage |
| function of sternothyroid muscle | pulls larynx down |
| function of thyrohyoid muscle | raises larynx up |
| innervation of thyrohyoid muscle | 1st cervical nerves |
| innervation of omohyoid, sternoyoid, sternothyroid muscles | 2nd and 3rd cervical nerves |
| what muscles cause mandibular protrusion | right lateral pterygoid and left lateral pterygoid |
| what muscles cause mandibular retrusion | horizontal fibers of temporal muscles and digastric muscle |
| what muscles cause right lateral excursion | contraction of left lateral pterygoid |
| what muscles cause left lateral excursion | contraction of right lateral pterygoid |
| what muscles cause mandibular elevation | medial pterygoids, masseter and temporal muscles |
| what muscles cause mandibular depression | inferior head of lateral pterygoids, hyoid muscles |
| What is the origin of the sternocleidomstoid muscle | sternum AND medial third of clavical |
| what is the insertion of the sternocleidomastoid muscle | mastoid process of temporal bone |
| function of sternocleidomastoid muscle | tilts and rotates head |
| origin of trapezius muscle | occiptal protuberance and cervical and thoracic vertabrate |
| insertion of trapezius muscle | scapula and clavical |
| function of trapezius muscle | elevates and rotates scapula |
| innervation of sternocleidomastoid and trapezius muscles | motor from XII cranial nerve |
| The Digastric Muscle has how many bellies | 2, anterior and posterior |
| Where is the location of the anterior belly of the digastric muscle | under the chin |
| where is the location of the posterior belly of the digastric muscle | under the ramus of the mandible |
| what is the tendinous loop associated with the two bellies of the digastric muscle | hyoid bone |
| Which muscle lies superficial to the sternothyroid muscle | sternohyoid muscle |
| What infrahyoid muscle has an intermediate tendon? | omohyoid muscle (the two bellies are separated by it) |
| what muscle lies deep to the temporalis muscle? | lateral pterygoid muscle |
| The two bellies of the omohyoid muscle lies deep to which muscle? | sternocleidomastoid muscle |
Created by:
kbowman12
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