5. muscles of facial expression and mastication
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29 terms
Terms | Definitions |
|---|---|
 Wrinklesforehead skin | frontalis |
| closes eyelids | obicularis oculi |
| Elevates angle of mouth | Zygomaticus Major & Minor |
| closes lips | obicularis oris |
| Elevates corner of upper lip | Levator Anguli Oris |
| Elevates upper lip | Levator labii Superioris |
| depresses corner of lip | Depressor Anguli Oris |
| Depresses lower lip | Depressor labii Inferioris |
| Compress cheek against teeth (helps during mastication) | Buccinator |
| wrinkles chin | mentalis |
| elevates skin of neck | platysma |
| The muscles of facial expression are innervated by the __1_, after it exits the _2_. The facial nerve will then divide into 5 main branches: These branches will pass through the substance of the _3_ to reach the muscles of facial expression. | 1. facial nerve 2. stylomastoid foramen 3.parotid gland |
| 5 main branches of facial nerve | Temporal, Zygomatic, Buccal, Mandibular, and Cervical |
| parotid gland is innervated by the ___ | glossopharyngeal nerve (CN IX) |
| if the facial nerve is damaged as it passes out of the stylomastoid foramen, a person can suffer from ___, where the muscles are not functioning on one side of the face. | bells palsy |
| the blood supply of the face comes primarily through branches of the ___. as this ascends it gives off ___ branches: ____ | 1. external carotid 2. superior thyroid, ascending pharyngeal, lingual, facial, occipital, posterior auricular, maxillary, and superficial temporal |
| the facial artery will emerge around the ___ and ascend as the ___ | mandible, angular artery |
| the venous drainage of the head and neck can vary. most often the facial vein joins the __1_ , and together these veins drain through the common trunk into the 2___ | 1. lingual vein 2. internal jugular |
| there is a communication between facial vein and the ___ veins and therefore blood can potentially flow in the cavernous sinus (possible root for infection to spread) | opthalmic veins |
| the superficial temporal vein will join the __1_ vein to form the _2_, which will have an anterior and posterior division. the anterior division will drain into the _3_, and the posterior division will join the _4_ vein and drain into the _5_. | 1.maxillary 2. retromandibular vein 3. internal jugular vein 4. posterior auricular 5. external jugular vein |
| the muscles of mastication are innervated by ___ | branches of mandibular division of the trigeminal nerve (V3) |
| temporalis Origin and insertion | O: inferior temporal line I: coronoid process of mandible |
| masseter origin and insertion | O: zygomatic arch I: mandibular angle |
| lateral pterygoid origin and insertion | O: Greater Wing of Sphenoid, Lateral aspect of lateral pterygoid plate I: mandibular angle |
| medial pterygoid origin and insertion | O: maxilla, medial surface of lateral pterygoid plate I: mandibular angle |
| temporalis action | elevation/retraction mandible |
| masseter action | elevation/protraction mandible |
| lateral pterygoid action | depression/protraction mandible |
| medial pterygoid action | elevation/protraction mandible |
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