Muscles of mastication
About this set
Created by:
bensam79 on November 1, 2011
Subjects:
Head and Neck Anatomy, Dental Hygiene
Description:
and TMJ
Log in to favorite or report as inappropriate.
Order by
67 terms
Terms | Definitions |
|---|---|
 Origin | What is the end of the muscle that is attached to the least moveable structure? |
| Insertion | What is the end of the muscle that is attached to the more moveable structure? |
| Action | What is the movement accomplished by a muscle when the muscle fibers contract? |
| Elevation, depression, protrusion, retursion, and lateral movements | What are the 5 primary jaw movements? |
| 5th cranial/ trigeminal | All muscles of mastication are innervated by what nerve? |
| Masseter, medial pterygoid, lateral pterygoid, and temporalis | What are the 4 main pairs of muscles of mastication? |
| Masseters, medial pterygoid, and temporalis | What 3 pairs of muscle are responsible for the elevation of the mandible? |
| Masseter and medial pterygoid | What muscles form a sling around the angle of the mandible? |
| Lateral pterygoid | What muscle pair is responsible for protrusion of the mandible? |
| Temporalis | What muscle pair is responsible for retrustion of the mandible? |
| Lateral pterygoid | Insertions of some fibers of what muscle extend into the TMJ capsule and to the articular disc? |
| Lateral pterygoid, digastric, and other suprahyoid muscles | What muscles are responsible for depression of the mandible? |
| Digastric | Which muscles consists of 2 bellies? |
| Elevator, retrudor, and protrudor | Assymetrical contraction of what other muscle actions are used for lateral movements of the jaw? |
| Lateral pterygoid | Contraction of one side of what muscle will shift the mandible to the opposite side? |
| Suprahyoid and infrahyoid | What 2 divisions are the muscles attached to hyoid bone separated into? |
| Swallowing and mastication | What actions do the suprahyoid and infrahyoid muscles play an important role in? |
| Digastric, Mylohyoid, geniohyoid, and stylohyoid | What are the 4 suprahyoid muscles? |
| Origin and insertion points | What do the names of muscles frequently reflect? |
| Mylohyoid | What sheet-like muscle forms the floor of the mouth? |
| Meets in the middle/the midline | The Mylohyoid muscle meets where before it continues to its insertion point? |
| Hyoid bone | Elevation of what bone is important for swallowing? |
| Genial tubercles | What are the small, bony projections on the interior surface of the mandibular symphisis? |
| Depression of the hyoid bone | What is the primary function of the infrahyoid muscles? |
| Sternothyroid, sternohyoid, omohyoid, and thyrohyoid | What are the infrahyoid muscles? |
| Skull, a joint capsule, a meniscus (disc) and 3 ligaments | What are the components of the TMJ? |
| Movable | The TMJ is the only one of what kind of joint/articulation on the skull? |
| Temporal and mandible | What 2 bones make up the articulations of the TMJ? |
| Fibrocartilage | What covers the articular surfaces of the bones of the TMJ? |
| Temporal | Which bone is the cranial articulation of the TJM? |
| Glenoid (articular) fossa and the articular eminence | What 2 features of the temporal bone make up the articulating area for the TMJ? |
| External acoustic meatus | The articular fossa is anterior to what? |
| Postglenoid process | What is the smooth, rounded ridge that is posterior to the articular fossa and forms the posterior border of the TMJ? |
| Mandible | What bone is the facial articulation of the TJM? |
| Condyle | The articulating surface of what part of the mandible articulates with the temporal bone in the articular fossa? |
| The joint capsule | What is fibrous and encloses the TMJ? |
| TMJ joint capsule | What wraps around the margin of the articular eminence, the articular fossa, and mandibular condyle and neck of the condyle? |
| Meniscus/ disc | What is located between the temporal bone and the condyle in the TMJ? |
| The shape of the adjacent articulating bones | The shape of the disc conforms to what? |
| 2 | The disc divides the TMJ into how many compartments? |
| Upper and lower synovial cavities | What are the 2 compartments of the TMJ called? |
| Synovial fluid | What fills the synovial cavities and lubes the joints? |
| Mandibular condyle, Postglenoid process, and the joint capsule | What 3 things are the meniscus/disc attached to? |
| Ligament | What is a band of fibrous tissue that connects bones called? |
| Temporomandibular joint ligament, sphenomandibular ligament, and stylomandibular ligament | What are the 3 paired ligaments associated with the TMJ? |
| Temporomandibular joint ligament | What ligament is located on the lateral side of each TMJ joint and forms a reinforcement of the joint capsule? |
| Retraction | The TMJ ligament prevents what excessive movement of the mandible? |
| Ramus (attaching just below the neck of the condyle) | The TMJ ligament runs from the zygomatic process of the temporal bone to the posterior surface of what? |
| Sphenomandibular ligament | What ligament is located on the medial side of the mandible? |
| Spine | The spenomandibular ligament runs from what feature of the sphenoid bone to the lingula of the mandible? |
| Stylomandibular ligament | What ligament is located on the medial side of the mandible and distal to the sphenomandibular ligament? |
| Angle | The stylomandibular ligament is located on the medial side of the mandible and distal to the sphenomandibular ligament? |
| Spenomandibular and stylomandibular ligaments | What 2 ligaments become taut during protrusion of the mandible? |
| Gliding and rotation | Normal function of the TMJ includes what 2 movements? |
| Gliding | What motion of the TMJ is primarily between the disc and the temporal bone? |
| Articular eminence | The disc and condyle glide up and down along what, causing the mandible to protrude and retract? |
| Rotation | What motion of the TMJ is primarily in the lower synovial cavity between the condyle and the disc? |
| Elevation and depression | What movements of the mandible are the results of rotation? |
| Depression and protrusion | Opening the jaws involves what motions? |
| Elevation and retrusion | Closing of the jaws involves what motions? |
| Lateral | What movements are created by gliding movements on one side of the jaw and little (if any) condular displacement on the other? |
| Deviation, pain, popping, and limitations | What are the 4 signs of pathology during joint movement? |
| Temporomandibular disorder (TMD) | What is the name given to pathologies of the TMJ? |
| Subluxation | What is an example of TMD that involves dislocation of the condyle anterior to the articular eminence causing muscle spasms and an inability to move the condyle back into position? |
| Trismus | What is a limitation of mandibular movement often caused by many factors? |
| Crepitus | What name refers to the sounds the TMJ may make that are associated with displacement of the meniscus? |
| Popping, clicking, and grinding | What are the sounds the TMJ may make if it has crepitus? |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.