Tongue and Floor of the Mouth Flashcards
what is the anterior boundary of the oral cavity
the lips/ oral fissure
what is the roof of the oral cavity
hard and soft palates
what is the floor of the oral cavity
soft tissues, including tongue
what are the lateral boundaries of the oral cavity
cheeks
what separates the oral cavity into the oral vestibule and the oral cavity proper
the dental arches
what connects the oropharynx and the oral cavity
the oropharyngeal isthmus
what is the depression in the midline of the lips
the philtrum
what is the arterial supply to the lips
the superior and inferior labial arteries from the facial arteries - they join in the midline of the lips to make an arterial ring
what is the sensory innervation of the lips
CN V2 supplies upper lip via infraorbital
CN V3 supplies lower lib via mental branch
what artery supplies the cheeks
the buccal artery - branch of maxillary artery
what is the sensory innervation to the cheeks
buccal branch of CN V3
what is the motor innervation to the cheeks
CN VII
where is the geniohyoid muscle located
superior to the mylohyoid muscle and inferior to the genioglossus
what is the geniohyoid origin and insertion
O = mental spine of mandible
I = body of the hyoid
where is the vallate papillae located
the largest papillae, arranged in V shape anterior to terminal sulcus of the tongue
where is the foramen cecum situated
a small pit in the midpoint of the terminal sulcus
what is the foramen cecum remnant of
the thyroglossal duct which the thyroid gland developed from
what marks the midline of the inferior surface of the tongue
the frenulum
what is found on either side of the frenulum
lingual vein and sublingual folds
what are two examples of veins of the tongue
deep lingual vein and dorsal vein
what are the four intrinsic muscles of the tongue
superior longitudinal. inferior longitudinal, transverse and vertical
what is the function of the superior and inferior longitudinal muscles
makes tongue short and thick
what is the function of the transverse and vertical muscles
makes tongue long and narrow
what are the four extrinsic muscles
genioglossus, hyoglossus, palatoglossus and styloglossus
what is the function of the genioglossus
responsible for protruding the tongue
where is the genioglossus situated
superior to the mylohyoid and geniohyoid muscles, attaching to the hyoid and superior mental spines of the mandible
what occurs if the genioglossus is not working and when might this occur
the tongue falls posteriorly and obstructs airway - this can happen during general anaesthesia
where is the hyoglossus muscle situated
lateral to genioglossus
what is the function of the hyoglossus
depressing the sides of the tongue
what major structure of the tongue passes between the hyoglossus and genioglossus muscles
the lingual artery
what is the function of the styloglossus muscle
elevating and retracting the mandible
where is the palatoglossus muscle situated
it originates from palatine aponeurosis on posterior surface of hard palate
what is the function of the palatoglossus
depresses soft palate towards the tongue
can lift the posterior tongue
what nerve supplies all the muscles of the tongue except from the palatoglossus
hypoglossal nerve
what supplies the palatoglossus muscle
the vagus nerve (CN X) via pharyngeal nerves
what supplies general sensation to anterior 2/3rd of tongue
CN V3 - lingual nerve
what supplies general sensation to the posterior 1/3rd of tongue
glossopharyngeal nerve (CN IX)
what supplies special sensation to anterior 2/3rds of tongue
chorda tympani via facial nerve (CN VII)
what supplies special sensation to posterior 1/3rd of tongue and the vallate papillae
glossopharyngeal nerve (CN IX)
what is the arterial supply of the tongue
lingual artery via the external carotid
what is the venous drainage of the tongue
the deep lingual and dorsal lingual veins that drain into the IJV either directly or via lingual vein
