Digestive- Oral Cavity

Question 1

Cavities

Answer 1

Anterior

Question 2

Pharyngeal space

Answer 2

Posterior

Question 3

Oral Cavity

Answer 3

mouth/ buccal cavity
Lined with epithelium= non-keratinized stratified epithelium (fast growing)
- can withstand abrasion from masticated food

Question 4

Boundaries of Oral Cavity

Answer 4

Boundaries
- Anterior: Lips (orbicularis oris), mucous membrane on inner surface, lips are attached to the gums by the labial frenulum
- Lateral: Cheeks (buccinator), covered by mucous membrane inside
- Superior: Palate (hard= maxilla, soft=skeletal muscle)
- Inferior: Tongue and floor of mouth (mylohyoid m)

Question 5

Oral Vestibular Space

Answer 5

between the inner surface of lips, cheeks, and outer surface of teeth

Question 6

Oral Cavity Proper

Answer 6

Area enclosed by the inside of the teeth and gums that extends back to the oropharynx. Contains the tongue

Question 7

Parotid Papilla

Answer 7

The projection of the parotid duct inside of the oral vestibule space. Contains the parotid gland that delivers saliva to the maxillary teeth

Question 8

Sublingual Frenulum

Answer 8

anchors the tongue to the floor of the mouth in the oral cavity proper

Question 9

Caruncles

Answer 9

openings of the submandibular duct, inferior to the tongue tip inside of the oral cavity proper

Question 10

Mylohyoid muscle

Answer 10

internal aspect of the mandible
inferior boundary of oral cavity
- has right and left muscle bellies
- IS THE FLOOR OF THE MOUTH
Attaches: internal deep mandible (mylohyoid line) and hyoid bone at C3
NOTE: the attachment of the mylohyoid muscle to the mylohyoid line separates the sublingual space from the submandibular space

Question 11

Mylohyoid innervation

Answer 11

1st Arch: All things V3 (efferent, mandibular nerve) serves the mylohyoid and the anterior belly digastric
2nd Arch: All things VII (efferent, facial nerve) serves the posterior belly digastric and stylohyoid.
NOTE: dual innervation of the digastric muscle is due to embryologic origination from the first two pharyngeal arches

Question 12

Genioglossus Muscle

Answer 12

major extrinsic tongue muscle, anterior and inferior. innervated by CN XII

Question 13

Hyoglossus Muscle

Answer 13

major extrinsic tongue muscle, posterior and inferior. innervated by CN XII

Question 14

Styloglossus Muscle

Answer 14

major extrinsic tongue muscle, superior and posterior. innervated by CN XII

Question 15

Palatoglossus Muscle

Answer 15

major extrinsic tongue muscle, superior and posterior, comes from the soft palate. innervated by CN X

Question 16

Submandibular Ganglion

Answer 16

secretomotor to submandibular and sublingual glands
-Preganglionic Parasympathetic: from Chorda Tympani (VII- special afferent and parasympathetic) accompanying Lingual N. (general afferent)
-Postganglionic Parasympathetic: to submandibular and sublingual glands

Question 17

Lingual Artery

Answer 17

Supplies the tongue
-travels deep to the hyoglossus muscle
-sends the dorsal lingual artery to serve the posterior tongue
-sends the sublingual artery and deep lingual artery anteriorly to tongue

Question 18

Filiform Papilla

Answer 18

cone-shaped, smallest and most abundant
HAVE NO TASTE BUDS
provide friction for licking
CN IX

Question 19

Fungiform Papilla

Answer 19

mushroom-shaped, taste buds, well vascularized (red tongue)
CN VII

Question 20

Vallate Papilla

Answer 20

12 large papilla, v-shaped, posterior, taste buds CN IX

Question 21

Foliate papilla

Answer 21

lateral aspect, taste buds, CN IX

Question 22

Structure of taste buds

Answer 22

gustatory hairs, gustatory pores, gustatory taste cells, supporting cells, basal cells, sensory nerve fibers (CN VII and CN IX)

Question 23

Taste sensations

Answer 23

Sweet, salty, sour, bitter