Flashcards in Lecture 30 RH Deck (53)
Where do the teeth sit in the oral cavity?
teeth are embedded in dental (alveolar) arches.
What is the joint found between the temporal bone and the mandible?
mandible articulates with temporal bone at the temperomandibular joint
What kind of joint is the temperomandibular joint?
sliding hinge joint
What do the muscles of the oral cavity assist with?
muscles help with chewing as well as forming the boundaries of the oral cavity.
Where does the temporalis muscle originate and insert?
temporalis originates at the side of the cranium and the has a tendon that attaches to the coranoid process of the mandible
Where does masseter originate and insert?
masseter attaches at the angle of the mandible and inserts onto the zygoma (part of the temporal bone and part of the zygomatic bone)
What do the temporalis and masseter muscles do when chewing?
temporalis and masseter work together to bring the mandible closer to the temporal bone when chewing
Which nerve innervates the muscles of facial expression?
facial nerve innervates muscles of facial expression
What does the orbicularis oris muscle do?
brings lips together
What is the buccinator?
Laterally there is a muscle embedded in the cheek which closes off the space between the mandible and the maxilla this muscle is called the buccinator
What is the principle regarding innervation of facial muscles?
Muscles involved in facial expression are innervated by the facial nerve
Muscles involved in mastication are innervated by the trigeminal nerve
What bones form the roof of the mouth?
Palatine process of the maxilla forms the anterior part
Posteriorly is the horizontal process of the palatine bone
What is the soft palate and where is it located?
Soft palate is located posteriorly which is formed by muscles and connective tissue and lined by mucosa.
What structures run under the mucosa of the roof of the mouth?
nerves and blood vessels run under mucosa
Where do the lesser and greater palatine arteries and nerves go in the mouth?
Lesser palatine nerve and artery project posteriorly mostly to the soft palate
Greater palatine nerve and artery run to the hard palate anteriorly and supply gingiva and mucosa of the roof of the mouth
How do the palatine nerves and arteries supply the inferior quadrant of the nasal cavity?
These arteries and nerves ultimately project through a foramen called the incisive foramen in the roof of the mouth to get to the inferior quadrant of the nasal cavity
What happens at the angle of the mandible?
Rami of the mandibles project upwards towards the temperomandibular joint
How is the mandible shape a problem and how is this problem fixed?
mandible is deficient inferiorly and this is closed up by a muscular diaphragm called the mylohyoid muscle (from mandible to hyoid)
Where do the nerves of the mandibular division of the trigeminal nerve run?
Medial to the rami (from the angle of the mandible) and close to the temporomandibular joint is the location where the mandibular branches of the trigeminal nerve run.
What do the mandibular branches of the trigeminal nerve innervate?
the tongue, teeth, and inferior alveolar nerve enters the mandible through a small foramen called the mandibular foramen to get to ther
Where does the alveolar nerve arise from and where does it go?
Alveolar nerve originates from the mandibular branch of the trigeminal nerve and runs through a small foramen called the mandibular foramen on the medial aspect of the ramus of the mandible and runs inside the bone towards the teeth.
How can the hyoid bone be palpated?
Hyoid bone sits in the crease between floor of our mouth and the neck. It can be palpated laterally.
What are the main sections of the tongue and how are they divided?
Tongue can be split into an anterior 2/3rds and a posterior 1/3rd by a sulcus terminalis. apex of the sulcus terminalis projects posteriorly.
What is the foramen that is found at the apex of the sulcus terminalis?
At the apex is a depression called the foramen caecum which is a remnant of the thyroglossal duct in development. (thyroid develops as an outpouching during development which drags down to the neck)
What are the arches that extend from the tongue and the pharynx called?
2 arches projecting up; one from the tongue and another from the pharynx. These arches are known as the palatopharyngeal arch and the palatoglossal arch.
What can be found between the arches of the pharynx and the tongue?
In between the palatopharyngeal and platoglossal arches are the palatine tonsils (the tonsils)
What can be found anterior and following the sulcus terminalis?
Anterior and following the sulcus terminalis are the valate (or circumvalate) papillae
What are foliate papillae and where can they be found?
Grooves on posterolateral part of the tongue called the foliate papillae and swellings between these grooves.
What papillae can be found in the anterior 2/3rds of the tongue?