Oral Cavity Flashcards
roof of oral cavity
hard & soft palates
floor of oral cavity
mainly soft tissues, including tongue
lateral walls of oral cavity
cheeks
how dental arches separate the oral cavity
separate it into oral vestibule and oral cavity proper
anteriorly, the oral fissure is created by
the lips
posteriorly to the dental arches is
the oropharynx which is accessed through the oropharyngeal isthmus
what is the oral vestibule
slit-like space between teeth and gingiva, and the lips and cheeks. it communicates with the exterior through the oral fissure
what is the oral cavity proper
space between upper and lower dental arches which also limit it laterally and anteriorly
what is the philtrum
a depression in the midline above the upper lip and is a vestigial feature
main muscle of lips
orbicularis oris muscle which acts as a sphincter for the oral fissure
blood supply of lips
superior and inferior labial arteries (branches of facial artery) anastomose with each other in lips to form an arterial ring
sensory innervation to the lips overall is via
CN V
sensory innervation of upper lip
CN V2 via superior labial branches of infraorbital nerves
sensory innervation of lower lip
CN V3 via inferior labial branches of mental nerve
lymphatic drainage of the lips is via
submandibular lymph nodes except medial part of lower lip which initially goes to submental nodes
main muscular component of cheeks
buccinator
blood supply of cheeks
via buccal branches of maxillary artery
sensory innervation of cheeks
buccal branches of mandibular nerve
motor innervation of cheeks
as with all muscles of facial expression, innervation is via the facial nerve
what is the labial frenulum
mucosal fold that connects the gingiva to the lips in the midline
what is the buccal frenulum
mucosal fold that is observed laterally
what forms the floor of the mouth
paired mylohyoid muscles
where do mylohyoid muscles connect
in the midline to the mylohyoid raphe
where is the geniohyoid in relation to mylohyoid
sit superior to the mylohyoid
attachments of geniohyoid
from inferior mental spine of mandible to the body of the hyoid
posterior 1/3 of tongue forms
anterior wall of oropharynx
what separates anterior and posterior parts of tongue
terminal sulcus
4 types of papillae on tongue
fungiform
foliate
vallate
filiform
fungiform papillae
mushroom shaped
foliate papillae
folds of mucosa lining posteriorly and laterally on superior surface
vallate papillae
largest papillae, arranged in a V shape anterior to terminal sulcus
filiform papillae
only papillae that have no taste buds
what is in posterior part of tongue instead of lingual papillae
lymphoid nodules collectively known as lingual tonsil
inferior surface of tongue midline is marked by
frenulum
2 types of muscle of tongue
intrinsic and extrinsic
muscles of the tongue are
paired and separated by a sagittal septum
function of intrinsic muscles
change size and shape of tongue
name the 4 intrinsic muscles of tongue
- superior longitudinal
- vertical
- transverse
- inferior longitudinal
function of extrinsic muscles of tongue
protruding, retracting, elevating and depressing tongue
name the 4 extrinsic muscles of tongue
- palatoglossus
- styloglossus
- hyoglossus
- genioglossus
genioglossus location
superior to geniohyoid muscle
genioglossus origin
superior mental spines of mandible
genioglossus insertion
inferior fibres attach to hyoid bone
superior fibres blend with intrinsic muscles of tongue
genioglossus function
protruding tongue
hyoglossus location
lateral to genioglossus
origin of hyoglossus
greater horn of hyoid
insertion of hyoglossus
intrinsic muscles on lateral aspects of tongue
function of hyoglossus
depressing sides of the tongue
what major arterial supply to tongue enters tongue between hyoglossus and genioglossus muscles
lingual artery
styloglossus origin
styloid process of temporal bone
insertion of styloglossus
fibres blend with intrinsic muscles of tongue and superior fibres of the hyoglossus
styloglossus function
elevation and retraction of tongue
palatoglossus origin
palatine aponeurosis
insertion of palatoglossus
fibres blend with intrinsic muscles on lateral surface of tongue
motor innervation of tongue is via
hypoglossal nerve & vagus nerve
hypoglossal nerve supplies which muscles of the tongue
genioglossus
hyoglossus
styloglossus
vagus nerve supplies which muscles of the tongue
palatoglossus
general sensation is
pressure, pain, temperature
general sensation of tongue supplied by
mandibular nerve CN V3 - anterior 2/3
glossopharyngeal nerve - posterior 1/3
special sensation is
taste
special sensation of tongue supplied by
facial nerve via chorda tympani - anterior 2/3
glossopharyngeal nerve - posterior 1/3
arterial supply of tongue
lingual artery which is a branch of ECA
venous drainage of tongue
deep lingual and dorsal lingual veins which drain to IJV
