Anatomy of oral cavity and tongue Flashcards
Where does the oral cavity extend from and to?
From the oral fissure
To the beginning of the oropharynx
What is the oral fissure?
The opening between the lips
What controls the diameter of the oral fissure?
Orbicularis oris muscle
What are the parts of the oral cavity?
Vestibule
Oral cavity proper
What divides the oral cavity into the vestibule and the oral cavity proper?
The dental arches
What is the vestibule?
Space between the lips/cheeks and the gums/teeth
What are the borders of the oral cavity proper?
Roof
Floor
Buccinator muscle
What is the roof of the oral cavity proper made up of?
Anteriorly is hard palate
Posteriorly is soft palate
What is the hard palate made up of?
Part of maxilla bone
What is the soft palate made up of?
Muscle
What is the uvula?
Continuation of soft palate posteriorly
What is the floor of the oral cavity made up of?
Tongue
Salivary glands and ducts
What takes up most space in the oral cavity proper?
The tongue
What is the tongue made up of?
Muscles
How many muscles is the tongue made up of?
Eight
What are the groups of muscles that make up the tongue?
Intrinsic muscles
Extrinsic muscles
How many intrinsic and extrinsic muscles make up the tongue?
4 intrinsic muscles
4 extrinsic muscles
What do the intrinsic muscles of the tongue attach to?
Other muscles of the tongue
What innervates the intrinsic muscles of the tongue?
CN12 hypoglossal nerve
What are the extrinsic muscles of the tongue?
Genioglossus
Hyoglossus
Styloglossus
Palatoglossus
What are the attachments of the hyoglossus muscle?
Hyoid bone
Tongue
What are the attachments of the styloglossus muscle?
Styloid process
Tongue
What are the attachments of the palatoglossus muscle?
Palate
Tongue
What are the innervations of the extrinsic muscles of the tongue?
Genioglossus, styloglossus, hyoglossus - CN12 hypoglossal nerve
Palatoglossus - CN10 vagus nerve
What is the sensory innervation of the tongue?
Anterior 2/3
general sensory - CN5 trigeminal nerve maxillary branch lingual nerve
special sensory taste - CN7 facial nerve chorda tympani
Posterior 1/3
gebneral sensory - CN9 glossopharyngeal nerve
special sensory taste - CN9 glossopharyngeal nerve
Where does the parotid gland drain into the oral cavity?
Upper quadrant
near second pre-molar
Where does the submandibular gland drain into the oral cavity?
Under surface of tongue
on either side of inferior franulum
Where does the sublingual gland drain into the oral cavity?
Under surface of tongue
in sublingual papillae
