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Fisk- Swallowing

Movements of mastication 1.Depression (Lateral Pterygoid M, infrahyoid muscles, digastric M). 2.Elevation (temporalis, masseter, and medial pterygoid). 3.Protraction (lateral pterygoid acting on articular disc). 4.Retraction (posterior temporalis fibers)
Movements of Grinding (mastication) Lateral grinders: Masseter and temporalis. Medial grinders: Medial and Lateral Pterygoids. **done by the 2 pre-molars and 3 molars
What teeth are specifically for biting off food? Spatula teeth. **NOT used for chewing
What type of joint is the TMJ Hinge synovial Joint with an articular disc.
What are the two connections onto the Articular Disc? 1.Lateral pterygoid M. 2.Elastic Ligament (connects it posteriorly)
What happens to the condyle of the mandible during chewing. It is moved out of the mandibular fossa. **Damage to the lateral pterygoid or the elastic ligament can cause the TMJ from functioning properly and lead to pain.
Which gland's secretions are more for digestion? lubrication? Digest: Submandibular. Lube: Parotid
Where did the tongue arise from? Occipital somites
What are the 2 main muscles that retract the tongue? 1.Styloglossus M. 2.Hyoglossus M.
2 main functions of the tongue in swallowing? 1.forming food into a bolus. 2.Pressing food against hard palate to force it into back of mouth.
What action closes the larynx? Raising it (thyrohyoid, pharyngeal constrictors)
What is the main function of Cricopharyngeus m? To keep air out of the stomach, must relax during swallowing.
Steps of Swallowing 1.Form bolus (tongue). 2.Move to oropharynx (tongue & styloglossus). 3.Close nasopharynx (LVP, TVP). 4.Close larynx (suprahyoid muscles). 5.Push down food (pharyngeal constrictors. RELAX cricopharyngeus)
Created by: WeeG



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