Lecture 28 - Oral Cavity Flashcards
What is the masseter muscle3?
origin on mandible, runs up to the zygoma (cheek bone)
chewing muscle - mastication
What is the features of temporalis?
origin along the temporal bone
projects down to the condyle of the mandible
orbicularis is important for…
forming a seal around drinks, kissing
stroke victims may be compromised - can’t close their mouth properly
What muscle fills the gap between orbicularis oris and masseter?
Buccinator - forms most of the cheek
what forms the roof of the mouth:
Palatine process of maxilla
going through the layers of the soft palate, what is there:
palatine glands
Greater palatine nerve and artery/ Lesser palatine nerve
The Greater palatine nerve and artery/ Lesser palatine nerve project up into the
nasal cavity
What makes up the floor of the mouth?
Mylohyoid muscle - makes up the floor
extends to the Hyoid bone
On the internal surface there is the Geniohyoid muscle
inferiorly there are a few others
Where does the Lingual nerve go?
into the floor of the mouth to supply the tongue
What innervates the lower teeth?
Inferior alveolar nerve
The part sof the maxilla and Mandible that are embedding the tooth:
alveolar arches
Where is the oral vestibule?
between cheek and teeth
Th tongue divided by what?
ant 2/3 posterior 1/3
by a V-shaped groove called the sulcus terminalis
What is deep to the mucosa on the psoterior 1/3 of the tonuge?
Lingual tonsils - cluster of lymphoid tissue
What is deep to the mucosa on the anterior 2/3 of the tonuge?
Papillae - number of different types:
Valate papillae -at the sulcus terminalis
Foliate pappillae - posterolaterally
Fungiform papillae - on the entire surface
What is the foramen caecum
depression downwards towards the neck at the apex of the sulcus terminalis
Thyroid gland develops from this - the ducts close up, this is a remnant
The taste buds are embedded in the walls of the ____
pappilar - particularly the circumvalate
Describe the filiform papillae?
line most of the tongue, small, don’t have taste buds
give the tongue a rough surface - to help pick up food (mostly for animals)
What are the Extrinsic muscles of tongue?
Styloglossus
Palatoglossus
Genioglossus
Hyoglossus
what are the features of Palatoglossus
contraction elevates the tongue - towards the palate
what are the features of Styloglossus
stylo-styloid process
retracts the tongue
what are the features of Hyoglossus
runs from the hyoid bone towards the tongue
depresses the tongue downwards
what are the features of Genioglossus?
from the inferior surface fot he tongue
pulls the back fo the tongue forward twoards the mandible
prorusion of the tongue
All tongue extrinsic muscles are innervated with the exception of palatoglossus - by the …
CNX11 - hypoglossal
palatoglossus - pharyngeal branch of Vagus
