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Stomatognathic System/TMJ

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.

4 Structural elements   1) Teeth 2) Bones 3) Cartilage 4) Ligaments  
3 Functional elements   1) Muscles 2) Blood supply 3)Nerves  
3 Bony parts of the system   1) Maxilla 2) Mandible 3) TMJ  
5 parts of the maxilla   1. Body 2. Zygomatic Process 3. Nasal process 4. Palatine process 5. Alveolar process  
2 Horizontal components of the mandible   1. Body 2. Alveolar process to hold teeth  
3 vertical components of the mandible   1. Ramus 2. coronoid process 3. condyles  
3 parts of the TMJ   1. temporal bone 2. glenoid fossa 3. condyle  
4 Ligaments   1. capsular 2. temperomandibular 3. sphenomandibular 4. stylomandibular  
Location of he capsular ligament   Encapsulates the TMJ (synovial capsule)  
Attachment of the capsular ligament   Condyle of the mandible to the zygomatic process  
Attachment ofthe temperomandibular ligament   Lateal aspect of the condylar neck to the zygomatic process  
Function of the temperomandibular ligament   Rotation (up to the point where the jaw must translate)  
Main suspensory ligament in hinge movement (rotation)   Temperomandibular ligament  
Attachment of the sphenomandibular ligament   From the medial ramus to the sphenoid bone  
Function of sphenomandibular ligament   Translation (takes over after rotation)  
Main suspensory ligament in translation   Sphenomandibular ligament  
Attachment of the stylomandibular ligament   Distal ramus to the styloid process  
Function of the stylomandibular ligament   Prevents excessive anterior drift when opening widely  
CT type of the disc assembly   Dense avascular collagenous  
Why is it good that there are no nerves in the disc assembly?   Otherwise, with breakdown, there would be pain in the disc  
Shape of the disc assembly   Biconcave  
Two ligaments that attach to the disc assembly   Medial and lateral collateral ligaments  
4 muscles of mastication   1. Masseter 2. Temporalis 3. Lateral (external) pterygoid 4. Medial pterygoid  
Muscles of mastication or neck muscles: Which are used for closing the mouth?   Muscles of mastication  
Function of the masseter   Elevate the mandible/clench  
Origin of the masseter   Zygomatic arch  
Insertion of the masseter   Lateral mandibular ramus  
Origin of the temporalis muscle   Temporal fossa  
Insertion of the temporalis muscle   Coronoid process  
Function of the anterior and middle belly of the temporalis muscle   Elevate the mandible  
Function of the posterior belly of the temporalis muscle   Retrude the mandible  
Origin of the medial pterygoid   Medial pterygoid plate  
Insertion of the medail pterygoid   Medial ramus/mandibular angle  
Function of the medial pterygoid muscle   Elevate the mandible  
Function of the inferior and superior lateral pterygoid   Protrude mandible/side to side movement  
Origin of the inferior head of the lateral pterygoid   Lateral surface of lateral pterygoid plate  
Insertion of the inferior head of the lateral pterygoid   Pterygoid fovea on condylar neck  
Origin of the superior head of the lateral pterygoid   Greater wing of the sphenoid  
Insertion of the superior head of the lateral pterygoid   TMJ meniscus and pterygoid fovea  
Two muscles of the "mandibular sling"   1. massetor 2. medial pterygoid  
Most impotant suprahyoid muscle   Digastric  
4 other functional muscles   1. suprahyoid 2. infrahyoid 3. SCM 4. trapezius  
Functions of the suprahyoids   Depress/retract mandible, elevate hyoid/larynx  
4 Infrahoid muscles   1. thyro 2. sterno 3. sternothyroid 4. omo  
Function of the infrahyoids   Lower the hyoid bone and larynx  
Four extrinisic tongue muscles   1. palatoglossus 2. genio 3. stylo 4. hyo  
3 things attached to styloid process   1. Styloglossus 2. Stylomandibular ligament 3. Stylohyoid  
2 Major arteries to the head/neck   1. internal carotid 2. external carotid  
3 branches of the external carotid   1. lingual 2. facial 3. maxillary  
Major plexus of veins in the head that will cause hematoma if you hit it with a PSA   Pterygoid plexus  
3 divisions of Trigeminal nerve   1. opthalmic 2. maxillary 3. mandibular  
4 Sensory divisions of the maxillary division   1. PSA 2. greater palatine 3. nasopalatine 4. infraorbital  
4 sensory branches of the mandibular division   1. IA 2. mental 3. lingual 4. buccal  
Motor branch of the mandibular division   masticatory nerve  
Innervation of the muscles of mastication   Trigeminal neve, Mandibular division  
Name of the sensory branch of the fascial nerve   Glossopalatine  
2 Sensory ares of the facial nerve   1. Anterior 2/3 tongue 2. soft palate  
2 Motor areas of the facial nerve   1. muscles of facial expression 2. submaxillary/sublingual glands  
Function of the TMJ   Connect mandible to maxilla  
TMJ joint type   Diarthrosis (free moving)  
TMJ movement type   Ginglymoarthroidal (rotation and translation)  
Bony components of the TMJ   1. Condyles 2. Glenoid fossa 3. Articular eminence  
A line bisecting the midline of condyles form an angle of ____ degrees   135  
True or false: Retrodiscal tissue does not have nerves or blood supply   False, if there is displacement of the joint, this will move into the condylar space and cause pain  
Two types of joint spaces of the TMJ   1. Superior cavity 2. Inferior cavity  
Cavity that predominates during translation   Superior cavity  
Cavity that predominates during rotation   Inferior cavity  
4 Suprahyoid muscles   1. Genio 2. Mylo 3. Stylohyoid 4. Digastric  


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