Oral Cavity Flashcards
Label this
Frenulum = attaches to the upper lip and also one under the tongue
Anterior folds = palatoglossal arches
Posterior folds = palatopharyngeal arches
These arches are created by muscles of the palate that pass to the tongue and pharynx.
The fauces is another name for the opening of the oral cavity (mouth).
Lateral walls of oral cavity formed by?
Buccinator
Which muscle forms a diaphragm in the floor of the mouth?
Anatomical relations?
Mylohyoid
Inferior = anterior belly of digastric (in ant. triangle of neck) Superior = geniohyoid (inside mouth)
Attachments of mylohyoid, geniohyoid + genioglossus?
(Genio = mandible, glossus = tongue)
Mylohyoid = mylohyoid line of mandible Geniohyoid = inferior genial tubercle of mandible Geioglossus = superior genial tubercle
Supra-hyoid muscles?
Function?
Mylohyoid, digastric, stylohyoid + geniohyoid
Elevate the hyoid bone
Label
Innervation of supra-hyoid muscles?
Post. belly of digastric + stylohyoid = facial nerve (post belly attaches to mastoid process + stylohyoid attaches to styloid process so sit either side of stylomastoid foramen from which facial nerve exits skull)
Mylohyoid + ant. belly digastric = mandibular division of trigeminal (CN V3)
Geniohyoid is odd one out = receives innervation from C1 nerves carried in hypoglossal nerve
Label
Label
This slide shows the relation between the submandibular duct and the lingual nerve (superior then passes inferior) and the hypoglossal nerve (inferior).
The lingual nerve is a branch of the mandibular division of the trigeminal nerve that supplies sensory innervation to the anterior 2/3rds of the tongue, and carries taste and parasympathetic fibres from the facial nerve. The hypoglossal nerve is the main motor supply to the tongue musculature
largest papillae? useful?
why is posterior 1/3 bumpy?
The largest papillae form a line 2/3rds of the way along the tongue – they are the vallate papillae
. This line of papillae can act as an approximate guide to whether you are observing the anterior 2/3rds of the tongue or the posterior 1/3rd
bumpy appearance due to the presence of the lingual tonsil which is embedded into this part of the tongue
special sense?
Special sense of taste to the anterior 2/3rds is carried to the tongue within the lingual nerve but the fibres originate in the facial nerve. The chorda tympani branch of the facial nerve carries these fibres and joins the lingual nerve in the infratemporal fossa
intrinsic muscles of tongue function?
innervation?
Change the shape of the tongue
Hypoglossal nerve CN XII
extrinsic muscles tongue?
function
innervation?
blood supply tongue?
lingual artery - 2nd branch of external carotid
It is crossed by the hypoglossal nerve, passes under hyoglossus and enters the floor of the mouth. It supplies the floor of the mouth, the extrinsic muscles and sends a deep branch into the body of the tongue
venous drainage tongue?
lingual vein –> internal jugular vein
…
Lingual nerve descending to the tongue from the infratemporal fossa, whereas the hypoglossal nerve passes from the hypoglossal canal at the base of the skull and passes over hyoglossus but under mylohyoid to enter the floor of the mouth
lymphatic drainage tongue
The tip of the tongue drains into nodes under the chin (submental).
The lateral edges of the tongue pass lymph into nodes around the submandibular salivary gland (submandibular).
The central and posterior parts of the tongue drain to deep nodes in the neck (deep cervical).
