Mouth, Tongue, and Submandibular Region Flashcards
Lecture 9
oral cavity proper
space medial to teeth (bounded by teeth), contains tongue
vestibule
space between lips and cheeks and teeth
sulcus terminalis
V-shaped groove divides tongue into the body and base
body
the anterior 2/3s, in the oral cavity
base
the posterior 1/3, in the pharynx; its surface is covered by lingual tonsil
papillae
vallate, foliate, fungiform, filiform papillae (nodules), some have taste buds
functions of the tongue
speech, manipulation and positioning of food, taste, swallowing, cleansing of the oral cavity
extrinsic muscles of the tongue
genioglossus
hypoglossus
styloglossus
palatoglossus
genioglossus
largest, fan shaped muscle; protrudes and depresses the tongue
hyoglossus
depresses and retracts the tongue
styloglossus
retracts and elevates the tongue
palatoglossus
elevates the base of the tongue
intrinsic muscles of the tongue originate and insert
within the tongue
intrinsic muscles of the tongue function
they change the shape of the tongue and play a key role in speech
nerve supply of both extrinsic and intrinsic muscles of the tongue
hypoglossal nerve (CN XII), except Palatoglossus muscle (CN X)
sensory innervation of the tongue
anterior 2/3s of the tongue and posterior 1/3 of the tongue
anterior 2/3s of the tongue sensory innervation
general sensation supplied by lingual nerve from V3
special sensation by facial nerve (CN VII) via Chorda tympani
posterior 1/3 of the tongue sensory innervation
general sensation + special sensation (taste): Glossopharyngeal nerve (CN IX)
motor innervation of the tongue
Hypoglossal nerve (CN XII) except Palatoglossus muscle (Vagus, CN X)
parasympathetic innervation of the tongue (to mucosa of the tongue)
Chorda tympani from Facial nerve - via Lingual nerve to the tongue
motor innervation
all tongue muscles: Hypoglossal nerve (CN XII), except Palatoglossus (CN X)
posterior 1/3 tongue innervation
general sensory and special sensory: Glossopharyngeal nerve (CN IX)
anterior 2/3s tongue innervation
general sensory: lingual nerve, branch of V3 of CN V
special sensory (taste): Chorda tympani (branch of CN VII)
lingual artery
provides blood supply to the tongue
a branch of the external carotid artery
lies on the medial aspect of the hypoglossus muscle
submandibular region
region between the mandible and the hyoid bone
submandibular gland
salivary gland
wraps around the posterior free border of the mylohyoid muscle
two parts of the submandibular gland
superficial portion: found in submandibular triangle of the neck
deep portion: in the floor of the mouth
submandibular duct is the
Wharton’s duct
submandibular duct carries saliva from
the submandibular gland to the mouth
approx. 5 cm long
the submandibular duct arises from and travels
the deep portion of the submandibular gland, and travels anteriorly in the floor of the mouth
submandibular duct terminates at
the sublingual papilla (caruncle) on both sides of the lingual frenulum
the submandibular duct travels on the lateral aspect of the ________ muscle and is crossed by the ______ _____
hypoglossus muscle
is crossed by the lingual nerve
sublingual gland is located
under the tongue, beneath the mucous membrane of the floor of the mouth; forms the sublingual fold (elevated crest of mucous membrane)
sublingual gland ducts
approx. 12 tiny ducts from the gland empty directly upward through the sublingual fold
some ducts of the sublingual gland open into the submandibular duct
what creates the division between the submandibular and sublingual spaces
mylohyoid muscle
submandibular space
between mylohyoid muscle and the deep cervical fascia
contains fat, submandibular gland (superficial part), lymph nodes, digastric muscles
sublingual space
between mylohyoid muscle and genioglossus muscle
contains geniohyoid muscle, sublingual gland, submandibular gland (deep portion), submandibular duct, lingual nerve, hypoglossal nerve (CN XII), lingual artery
