Stomatognathic System/TMJ
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| 4 Structural elements | 1) Teeth 2) Bones 3) Cartilage 4) Ligaments
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| 3 Functional elements | 1) Muscles 2) Blood supply 3)Nerves
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| 3 Bony parts of the system | 1) Maxilla 2) Mandible 3) TMJ
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| 5 parts of the maxilla | 1. Body 2. Zygomatic Process 3. Nasal process 4. Palatine process 5. Alveolar process
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| 2 Horizontal components of the mandible | 1. Body 2. Alveolar process to hold teeth
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| 3 vertical components of the mandible | 1. Ramus 2. coronoid process 3. condyles
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| 3 parts of the TMJ | 1. temporal bone 2. glenoid fossa 3. condyle
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| 4 Ligaments | 1. capsular 2. temperomandibular 3. sphenomandibular 4. stylomandibular
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| Location of he capsular ligament | Encapsulates the TMJ (synovial capsule)
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| Attachment of the capsular ligament | Condyle of the mandible to the zygomatic process
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| Attachment ofthe temperomandibular ligament | Lateal aspect of the condylar neck to the zygomatic process
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| Function of the temperomandibular ligament | Rotation (up to the point where the jaw must translate)
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| Main suspensory ligament in hinge movement (rotation) | Temperomandibular ligament
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| Attachment of the sphenomandibular ligament | From the medial ramus to the sphenoid bone
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| Function of sphenomandibular ligament | Translation (takes over after rotation)
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| Main suspensory ligament in translation | Sphenomandibular ligament
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| Attachment of the stylomandibular ligament | Distal ramus to the styloid process
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| Function of the stylomandibular ligament | Prevents excessive anterior drift when opening widely
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| CT type of the disc assembly | Dense avascular collagenous
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| Why is it good that there are no nerves in the disc assembly? | Otherwise, with breakdown, there would be pain in the disc
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| Shape of the disc assembly | Biconcave
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| Two ligaments that attach to the disc assembly | Medial and lateral collateral ligaments
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| 4 muscles of mastication | 1. Masseter 2. Temporalis 3. Lateral (external) pterygoid 4. Medial pterygoid
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| Muscles of mastication or neck muscles: Which are used for closing the mouth? | Muscles of mastication
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| Function of the masseter | Elevate the mandible/clench
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| Origin of the masseter | Zygomatic arch
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| Insertion of the masseter | Lateral mandibular ramus
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| Origin of the temporalis muscle | Temporal fossa
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| Insertion of the temporalis muscle | Coronoid process
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| Function of the anterior and middle belly of the temporalis muscle | Elevate the mandible
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| Function of the posterior belly of the temporalis muscle | Retrude the mandible
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| Origin of the medial pterygoid | Medial pterygoid plate
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| Insertion of the medail pterygoid | Medial ramus/mandibular angle
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| Function of the medial pterygoid muscle | Elevate the mandible
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| Function of the inferior and superior lateral pterygoid | Protrude mandible/side to side movement
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| Origin of the inferior head of the lateral pterygoid | Lateral surface of lateral pterygoid plate
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| Insertion of the inferior head of the lateral pterygoid | Pterygoid fovea on condylar neck
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| Origin of the superior head of the lateral pterygoid | Greater wing of the sphenoid
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| Insertion of the superior head of the lateral pterygoid | TMJ meniscus and pterygoid fovea
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| Two muscles of the "mandibular sling" | 1. massetor 2. medial pterygoid
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| Most impotant suprahyoid muscle | Digastric
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| 4 other functional muscles | 1. suprahyoid 2. infrahyoid 3. SCM 4. trapezius
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| Functions of the suprahyoids | Depress/retract mandible, elevate hyoid/larynx
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| 4 Infrahoid muscles | 1. thyro 2. sterno 3. sternothyroid 4. omo
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| Function of the infrahyoids | Lower the hyoid bone and larynx
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| Four extrinisic tongue muscles | 1. palatoglossus 2. genio 3. stylo 4. hyo
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| 3 things attached to styloid process | 1. Styloglossus 2. Stylomandibular ligament 3. Stylohyoid
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| 2 Major arteries to the head/neck | 1. internal carotid 2. external carotid
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| 3 branches of the external carotid | 1. lingual 2. facial 3. maxillary
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| Major plexus of veins in the head that will cause hematoma if you hit it with a PSA | Pterygoid plexus
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| 3 divisions of Trigeminal nerve | 1. opthalmic 2. maxillary 3. mandibular
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| 4 Sensory divisions of the maxillary division | 1. PSA 2. greater palatine 3. nasopalatine 4. infraorbital
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| 4 sensory branches of the mandibular division | 1. IA 2. mental 3. lingual 4. buccal
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| Motor branch of the mandibular division | masticatory nerve
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| Innervation of the muscles of mastication | Trigeminal neve, Mandibular division
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| Name of the sensory branch of the fascial nerve | Glossopalatine
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| 2 Sensory ares of the facial nerve | 1. Anterior 2/3 tongue 2. soft palate
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| 2 Motor areas of the facial nerve | 1. muscles of facial expression 2. submaxillary/sublingual glands
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| Function of the TMJ | Connect mandible to maxilla
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| TMJ joint type | Diarthrosis (free moving)
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| TMJ movement type | Ginglymoarthroidal (rotation and translation)
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| Bony components of the TMJ | 1. Condyles 2. Glenoid fossa 3. Articular eminence
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| A line bisecting the midline of condyles form an angle of ____ degrees | 135
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| 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
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| Two types of joint spaces of the TMJ | 1. Superior cavity 2. Inferior cavity
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| Cavity that predominates during translation | Superior cavity
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| Cavity that predominates during rotation | Inferior cavity
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| 4 Suprahyoid muscles | 1. Genio 2. Mylo 3. Stylohyoid 4. Digastric
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