Oral Cavity 1 Flashcards
What are the boundaries of the oral cavity?
Extends from the lips to the oropharyngeal isthmus
What is the oropharyngeal isthmus?
Is the junction of mouth and pharynx
What is the oral cavity divided into?
Vestibule and oral cavity proper
What is the vestibule?
Slit like space between the cheeks and the gums
What is the oral cavity proper?
Everything
Not cheeks and teeth
Where does the vestibule communicate with the oral cavity proper?
The cavity behind the third molar on each side
What muscle forms the lateral wall of vestibule?
Buccinator muscle
What covers the cheek (buccinator muscle medically and laterally?
Laterally = skin
Medially = mucous membrane
What is the small papilla?
mark the opening of ducts and bumps/taste buds on tongue
Where are the small papilla found in the vestibule?
Upper second molar tooth
What do the papilla near the upper second molar tooth mark?
Duct of the parotid gland
What alveolar margins are the oral cavity proper within?
The maxillae and the mandible
What forms the roof of the oral cavity proper?
Formed by the hard palate anteriorly and the soft palate posteriorly
What forms the floor of the oral cavity proper?
Mylohyoid muscle
What part of the tongue lies on the floor of the oral cavity proper?
Anterior 2/3
What is the floor of the mouth covered in?
Mucous membrane
What does the frenulum connect?
The tongue to the floor of the mouth
What is found at each side of the frenulum?
A small papilla has the opening of the duct of the submandibular gland
What does the sublingual gland drain into?
Submandibular lymph nodes
What nerves supply the roof of the oral cavity?
Greater palatine and nasopalatine nerves - branches of maxillary nerve
What are the greater palatine and nasopalatine nerves branches of?
The maxillary nerve
What nerve supplies the floor of the oral cavity?
Lingual nerve (branches of mandibular nerve)
what nerve supply the cheek of the oral cavity?
Buccal nerve (branch of mandibular)
what are the buccal and lingual nerves branches of?
Mandibular nerve
What type of innervate on are the greater palatine, nasopalatine, lingual and buccal nerves?
Sensory innervate on
What gives motor innervation to the buccinator and orbicularis oris muscles?
Branches of the facial nerve
Describe the tongue
Mass fo striated muscles covered with muscles membrane
What separates the left and right halves of the tongue?
Median septum
Name the 3 parts of the tongue
Oral (anterior 2/3)
Pharyngeal (posterior 1/3)
Root
What are the dorsal and ventral parts of the tongue?
Dorsal = bigger upper surface
Ventral = under the tongue
What differentiates the anterior 2/3 and posterior 1/3 of tongue?
V -shaped sulcus terminalis
what marks the apex of the sulcus terminalis?
Foremen cecum
What does the foremen cecum mark?
Upper end of the thyroglossal duct
What are the 3 types of papillae in the anterior 2/3 of the tongue?
Filliform
Fungiform
Vallate
Does the posterior 1/3 of tongue have papillae?
No
What does the posterior 1/3 of tongue show?
Modular surface because of underlying lymphatic nodules, the lingual tonsils
What vein is found laterally to the frenulum?
deep lingual vein
What drug is absorbed under the tongue?
Nitroglycerin
What is nitroglycerin used for?
Vasodilator
In angina pectoris
What blood vessel does nitroglycerin enter?
The deep lingual veins
What lies laterally to the lingual vein?
A fold of mucosa forms the plica fimbriata
what 2 types of muscle make the tongue?
Intrinsic and extrinsic
What are the intrinsic muscles of teh tongue?
Longitudinal fibres
Transverse fibres
Vertical fibres
Confined to tongue
What is the function of the intrinsic muscles of the tongue?
alter tongue shape
What is the function of the extrinsic muscles of the tongue?
Help movements of the tongue
What are the extrinsic muscles of the tongue?
Palatoglossus
Genioglossus
Hyoglossus
Styloglossus
What structures do the extrinsic muscles connect the tongue to?
To surrounding structures
The soft palate and the bones (mandible, hyoid bone, style I’d process)
What is the movement of the genioglossus?
Protrusion
What is the movement of the styloglossus?
Retraction an elevation
What is the movement of the hyoglossus?
Retraction and depression
What is the movement of the palatoglossus?
elevation
What muscles allow retraction of tongue?
Styloglossus and hyoglossus
What muscles allow depression of the tongue?
Hyoglossus and genioglossus
What muscles of teh tongue allow elevation?
Styloglossus and palatoglossus
