C1 - Oral cavity and its features Flashcards
1
Q
Oral cavity
Structures to mention in the oral cavity
A
- Vestibulum oris (Space between the teeth and lips and cheeks)
- Rima oris (Slit between lips, mouth opening)
- Labia oris (Lips)
- Labium suerius/maxillare (Upper lip)
- Philtrum (Median groove from the nasal septum to the upper lip)
- Labium inferius/mandibulare (Lower lip)
- Angulus oris
- Bucca (Cheek)
- Cavum oris proprium (Cavity enclosed by the teeth and limited caudally by the arcus palatoglossus)
- Palatum durum (Hard palate, supported by bone)
- Palatum molle [Velum palatinum] (Soft palate, caudal part of the palate)
- Raphe palati (Median line of junction of the halves of the palate)
- Recessus sublingualis lateralis (Space under the tongue, between the frenulum linguae and the mandible)
- Gingiva (Gum, mucous membrane attached to the teeth and alveolar bone)
- Caruncula sublingualis (Flattened projection rostrolateral to the frenulum linguae, ductus mandibularis and ductus sublingualis major opens there)
- Plica sublingualis (Fold of mucous membrane on the floor of the mouth lateral to the frenulum linguae, ends in carucula sublingualis)
- Papilla parotidea (Small elevation of the buccal mucosa at the orifice of the ductus partoideus opposite the upper fourth premolar)
- Papilla zygomatica (ca) (Short fold of buccal mucosa extending caudally form the papilla partoidea and bearing the orifices of the ductus glandulae zygomaticae opposite the upper molars)
- Rugae palatinae (Transvers ridges of the mucosa on the hard palate)
- Pulvinus dentalis (Dental pad)
- Papilla incisiva (Elevation of mucous membrane at the rostral end of the raphe palati)
- Plica pterygomandibularis (Dorsoventral fold of mucous membrane between the palate and the mandible behind the last molars)
2
Q
Oral cavity
Interspecies differences
A
- Papilla zygomatica (ca)
- Gl. buccalis medius (ru)
- Gl. buccalis dorsalis:
- Car: medial to arcus zygomaticus, called gl. zygomaticus
- Fossa tonsillaris (car)
- Eq: hard palate contains venous plexus
3
Q
Oral cavity
Give the osseus support of the oral cavity
A
- Os palatina (lamina horizontalis)
- Os incisiva
- Os maxilla (palatine & processus alveolaris)
- Mandibula
4
Q
Oral cavity
Give the borders of the oral cavity
A
- Rostral: lips
- Lateral: cheeks
- Roof: hard palate
- Ventral: tongue
- Floor: suprahyal muscles
5
Q
Oral cavity
Cavum oris proprium
A
-
Vestibulum and cavum oris proprium communicate via:
- Interdental space (diastema: space between incisors and cheek teeth)
- Space behind the last molars
- Enclosed by the teeth
- Caudal border: arcus palatoglossus
6
Q
Oral cavity
Labia oris
A
-
Upper lip
- Ca, su: smaller
- Eq, ru: presents the chin
- Lower lip
-
Labial glands:
- In submucosa
- Well developed near angulus oris
7
Q
Oral cavity
Philtrum
A
- Median cleft from septum nasi → upper lip
- Car, small ru: divides the upper lip
8
Q
Oral cavity
Rima oris
A
- Oral cleft = rima oris
- Entrance to the oral cavity
- Bounded by the edges of the upper and lower lips
- Unite on each side at the angulus oris
9
Q
Oral cavity
- Cheeks (buccae)
- Buccal glands
A
- Forms the lateral wall of the vestibulum
- Attached to margo alveolaris of the mandible and maxilla in the region of the cheek teeth
- Its caudal portion contains m. masseter
Buccal glands:
-
Gl. buccalis dorsalis
- Car: medial to arcus zygomaticus, called gl. zygomaticus
- Gl. buccalis ventralis
- Gl. buccalis medius (ru)
- Their ducts opens into vestibulum oris
10
Q
Oral cavity
Gums (gingivae)
A
- Part of the oral mucosa
- United to the periosteum of the procussus alveolaris of the jaws
- Encircle the necks of the teeth - margo gingivalis
- Papilla gingivalis (interdentalis): mucosal elevation between the teeth
- Sulcus gingivalis: groove between gingiva and tooth
Gums in ruminants:
- Gums are modified
-
Pulvinus dentalis:
- Dental pad
- Formed by gum
- Takes the place of the upper incisors (in ru: takes place of the missing incisors)
11
Q
Oral cavity
Hard palate
A
- Roof of the oral cavity proper
- Bounded laterally and rostrally by the upper dental arch
- Eq: its mucosa contains venous plexus
-
Ruga palatinae:
- On either side of raphe palatini
- Ru: the crests of the ridges are studded by cornified papillae
- Number of palatine ridges in different species:
- Ca: 6-10 pairs
- Su: 20-23 pairs
- Ox: 15-20 pairs
- Eq: 16-18 pairs
-
Papilla incisiva:
- Elevation of mucous membrane at the rostral end of the raphe palatini
- Found behind:
- Upper incisors
- Dental pad
- Conceals the orifices of ductus incisivi
12
Q
Oral cavity
Draw a cross section of hard palate
A
13
Q
Oral cavity
Draw the maxillary part of the oral cavity
A
14
Q
Oral cavity
Soft palate (palatum molle)
A
- Su: rudimentary uvula
- Muscles of the soft palate:
-
M. palatinus
- O: free border of os palatinus
- I: caudal border of soft palate
- A: shortens the soft palate
-
M. tensor veli palatini
- O: proc. muscularis of pars tympanica of os temporale
- I: aponeurosis of soft palate
- A: Tenses, straightens the rostral part of the soft palate
-
M. levator veli palatini
- O: proc. muscularis of pars tympanica of os temporale
- I: soft palate
- A: raises the soft palate toward the basis cranii
-
M. palatinus
-
Arcus palatoglossus:
- Mucosal pillars
- Connect the soft palate with the radix linguae
- Forms the lateral boundaries of the isthmus faucium
-
Arcus palatopharygeus:
- Mucosal pillars
- Connect the soft palate with the lateral wall of pharynx
- Contain lymphoid tissue
- Contain glandulae palatini
15
Q
Oral cavity
Fossa tonsillaris
A
- Car
- Between arcus palatoglossus → arcus palatopharyngeus
- Houses palatine tonsile
17
Q
Oral cavity
Draw the general features of the entire oral cavity
A
18
Q
Oral cavity
Draw cross section of isthmus faucium
A
19
Q
Oral cavity
Draw the mandibular part of the oral cavity
A
