Head and Neck 4 Flashcards
What is A?
Coronoid process
What is B?
Condyler process
What is C?
Mandibular foramen
What is D?
Angle
What is E?
Mental foramen
What is F?
Mental protrubence
What are the different types of teeth?
Incisor
Canines
Premolars
Molars
How many of each type of deciduous teeth are there?
Incisor 8
Canines 4
Molars 8
How many of each type of permanent teeth are there?
Incisors 8
Canines 4
Premolars 8
Molars 12
What type of joint is the temporomandibular joint (TMJ)?
Hinge (synovial)
What are the 2 articular processes that form the temporomandibular joing?
Mandibular fossa of the temporal bone
Condyler process of the mandible
What movements of the mandible occur at the TMJ?
Elevation (close mouth)
Depression (open mouth)
Protrusion (protude chin)
Retrusion (retrude chin)
Side to side movements (grinding and chewing)
What are the muscles of mastication?
Temporalis
Masseter
Medial pterygoid
Lateral pterygoid
What are the bony attachments of the temporalis muscle?
Temporal fossa
Coronoid process of mandible
How do the fibres of the temporalis differ?
Anterior fibres are nearly vertical
Posterior fibres are nearly horizontal
What happens when the anterior fibres of the temporalis contract?
Elevation
What happens when the posterior fibres of the temporalis contract?
Lateral movement of same side and retrusion
What are the bony attachments of the masseter?
Zygomatic arch
Outer surface of the ramus and coronoid process of the mandible
What are the actions of the masseter?
Elevation (mainly)
Protrusion
Retrusion
Lateral movement
What does the medial pterygoid muscles attach to?
Lateral surface of the lateral pterygoid plate of the skull
What does the medial pterygoid muscle attach to?
Medial surface of the lateral pterygoid plate
To which part of the mandible does the lateral pterygoid muscle attach?
Enters into joint capsule of the TMJ to insert onto neck of mandible and also the articular disc of this joint
To which part of the mandible does the medial pterygoid muscle attach?
Medial surface of ramus and angle of mandible
What are the actions of pterygoid muscles?
Protrusion and depression (when both lateral contract)
Lateral movement (when lateral pterygoid contracts with medial of same side)
Elevation and protrusion (when two medial contract)
What is A?
Temporalis
What is B?
Zygomatic arch
What is C?
Masseter
What is D?
Mandible
What is E?
Medial pterygoid
What is F?
Lateral pterygoid
What group of muscles produce depression of the mandible?
the lateral pterygoid muscles and the suprahyoid muscles (run from mandible to hyoid bone)
What are the suprahyoid muscles that depress the jaw?
Anterior digastric
Geniohyoid
Mylohyoid
What is A?
Digastric (anterior belly)
What is B?
Mylohyoid
What is C?
Digastric (posterior belly)
What is D?
Stylohyoid
What muscles produce elevation of the mandible?
1) Masseter
2) Temporalis
3) Medial pterygoid
What muscles produce depression of the mandible?
1) Anterior digastric
2) Geniohyoid
3) Mylohyoid
4) Lateral Pterygoid
What muscles produce protrusion of the mandible?
1) Lateral pterygoid (main)
2) Masseter
3) Medial pterygoid
What muscles produce retraction of the mandible?
1) Temporalis (posterior)
2) Masseter
What muscles produce side to side movements of the mandible?
1) Temporalis of same side
2) Pterygoids of same side
3) Masseter
Innervation of the muscles of mastication is done by branches of what?
Mandibular division of trigeminal mnerve
Where does the mandibular nerve emerge from?
Oval foramen
Where do the motor branches of the mandibular nerve supply the muscles of mastication?
Infratemporal fossa