Digestive System I Flashcards
What are the two subdivisions of the oral cavity?
- Vestibule
2. Oral Cavity Proper
What areas of the oral cavity are included in the vestibule region?
behind the lips, in front of the teeth with the mouth closed
What areas of the oral cavity are included in the oral cavity proper?
Behind teeth, roof of mouth, tongue, oral pharynx
What is the function of the tonsils? Where are they located?
Surveillance system for immune system
Make a ring around oral pharynx
What are the three types of mucosa?
- Masticatory
- Lining
- Specialized
What are the characteristics of the masticatory mucosa? Where is it found?
Keratinized/parakeratinized
Gingiva, hard palate
What is parakeratinization? Where is it found?
Still some nuclei
found in gingiva, hard palate
What are the characteristics of the lining mucosa? Where is it found?
Nonkeratinized
Lips, cheeks, soft palate
What are the characteristics of the specialized mucosa? Where is it found?
specifically in the regions of the taste buds on lingual papillae on the dorsal surface of the tongue;
contains nerve endings for general sensory reception and taste perception.
What are the three aspects of the mucosa?
Epithelium
Lamina papilla
Muscularis mucosa
What are the three aspects of the submucosa?
Dense connective tissue, blood and lymphatic vessels, and the submucosal plexus (plexus of Meissner)
What are the three layers of the lips?
- Cutaneous (external)
- Red (vermillion)
- Oral Mucosa
What are the characteristics of the cutaneous/external layer of the lips?
Keratinized
Hair follicles
Sebaceous and sweat glands
Thin
What are the characteristics so the red (vermilion) layer of the lips?
Thick Keratinized Papillae large stratum spinosum deep rete ridges full of LCT
What gives lips their red color?
The deep rete ridges full of LCT, which includes blood vessels, in the red/ vermilion layer of the lips
In what layer of the lips are the Meisner’s corpuscles located?
The red/vermilion layer
What are the characteristics of the oral mucosa?
Thick epithelial layer
para/nonkeratinized
What does the submucosa of the cheeks do?
Anchors mucosa to underlying skeletal muscle
What characteristics of the lamina propria allow for the movement of skeletal muscle in the cheeks?
The lamina propria is less thick
Are the cheeks kerintinzed? Is the lamina propria and submucosa dense or loose?
Nonkeratinized
Dense
What two parts of the gingiva does the lamina propia bind to?
Periosteum and periodontal ligament
What do gingiva lack? (2)
Lack submucosa
Lack glands
Are gingiva keratinized?
Keratinized
What is the function of the gingiva?
Barrier to lower regions of the tissue, blocking micro bacteria etc
What is the function of the hard palate?
Assists tongue in preparation of bolus
What type of mucosa lines the hard palate?
Masticatory mucosa
What is the submucosa of the hard palate made of?
Adipose tissue
What function does the palatine raphe severe in the hard palate?
Directly attaches to palatine bone which makes the hard palate immovable
What is the function of the soft palate?
Prevents passage of food/fluids between oral and nasal pharynges
What type of mucosa lines the soft palate?
Lining mucosa
Does the soft palate have a thick or shallow lamina propia?
Shallow
Does the hard palate have a thick or shallow lamina propia?
Thick
What are the three types of salivary glands? What are the relative percentages of saliva they produce?
- Parotid gland (25%)
- Submandibular gland (65-70%)
- Sublingual gland (5%)