13a - oral mucosa and buccopharyngeal lymphatic ring

digestive system

how many coats does a typical tubular organ have?

4

digestive system

what are the coats of the tubular organs also called

tunica or tela

digestive system

what is a “tela”

a delicate weblike structure

digestive system

what is a “tunica”

a denser tissue layer

digestive system - tunica mucosa

what is the tunica mucosa also called

mucous membrane (mucosa)

digestive system - tunica mucosa

where is the mucous membrane located

next to the lumen

digestive system - tunica mucosa

do oral cavity structures have mucosa

yes

digestive system - tunica mucosa

are oral cavity structures tubular organs?

no

digestive system - tunica mucosa

what are the 3 layers or laminae of mucosa

• epithelium

• lamina propria

• lamina muscularis

LOOK

done

digestive system - tunica mucosa

what does the epithelium include

different types + basement membrane

digestive system - tunica mucosa

what type of connective tissue is in the lamina propria

loose connective tissue

digestive system - tunica mucosa

what immune cells are found in the lamina propria

T and B lymphocytes

digestive system - tunica mucosa

LISTEN AND DO A FLASHCARD ON LYMPHATIC TISSUE PAGE 3

done

digestive system - tunica mucosa

what additional structures may be in lamina propria

mucosal glands

digestive system - tunica mucosa

is lamina muscularis always present

no (inconstant)

digestive system - tunica mucosa

what is lamina muscularis made of

1-3 layers of smooth muscle

digestive system - tunica mucosa

function of lamina muscularis

allows independent movement of mucosa

digestive system - tunica mucosa

what is it called when lamina muscularis is absent

propria-submucosa

digestive system - tela submucosa

What is the submucosa made of?

Connective tissue

digestive system - tela submucosa

What structures may be found in submucosa?

Submucosal glands

digestive system - tela submucosa

How does submucosa CT compare to lamina propria?

Denser

digestive system - tela submucosa

What vessels are present in submucosa?

Blood and lymph vessels

digestive system - tela submucosa

What nerve plexus is found in submucosa?

Meissner’s (submucosal) plexus

digestive system - tela submucosa

What system is Meissner’s plexus part of?

Autonomic nervous system

What is the tunica muscularis composed of?

Smooth muscle

Function of tunica muscularis?

Movement and mixing of ingesta

tunica muscularis

movement of the ingesta through the tract and the mixing of ingesta with ……what

glandular secretions

How many muscle layers are usually present?

2

Orientation of muscle fibres inner muscle layer?

Circular

Orientation of outer muscle layer?

Longitudinal

What plexus lies between muscle layers?

Myenteric (Auerbach’s) plexus

What system is Auerbach’s plexus part of?

Autonomic nervous system

What is the outermost tunic of tubular organs?

Tunica serosa or tunica adventitia

What is the tunica serosa made of?

Connective tissue with a covering of mesothelium

Which organs are covered by serosa?

Organs bordering pleural, pericardial, and peritoneal cavities

What is the serosa called in the pleural cavity?

Pleura

What is the serosa called in the pericardial cavity?

Epicardium

What is the serosa called in the peritoneal cavity?

Peritoneum

What do organs NOT bordering body cavities lack?

Mesothelium

What covers organs that lack mesothelium?

Tunica adventitia

What is tunica adventitia made of?

Connective tissue

What does tunica adventitia blend with?

Surrounding fascia

What is the largest organ in the body?

Skin

what epithelium is the skin

squamous stratified keratinised epithelium

What are the two main layers of skin?

Epidermis and dermis

What is the epidermis derived from?

Ectoderm

What type of tissue is the epidermis?

Specialized epithelium

What is the dermis derived from?

Mesoderm

What type of tissue is the dermis?

Vascular dense irregular connective tissue

What are dermal papillae?

Irregular projections of the dermis

What do dermal papillae interdigitate with?

Dermal ridges of the epidermis

What is the hypodermis also called?

Subcutis

What type of tissue is the hypodermis?

Loose connective tissue with fat

Function of hypodermis?

Connects skin to underlying tissues

What structures are found in dermis and hypodermis?

Blood vessels, lymph vessels, nerves

Where are sweat, sebaceous, and mammary glands located?

In dermis and hypodermis

What structures are epidermal but located in dermis/hypodermis?

Hair and feather follicles

What covers the surface of the oral cavity?

Mucous membrane

What two components form the oral mucosa?

Stratified squamous epithelium and lamina propria

stratified squamous epithelium cab be what

keratinised or non-keratinised

what are the 2 different options for keratinised

• Orthokeratinized

• Parakeratinized

What type of epithelium is oral mucosa?

Stratified squamous epithelium

What is the connective tissue of oral mucosa called?

Lamina propria

lamina propria is what

basement membrane

Oral mucosa is continuous with what at the lips?

Skin through the vermilion border

Oral mucosa is continuous posteriorly with what?

Pharyngeal mucosa

What connects oral mucosa to underlying structures?

Submucosa

What type of tissue is submucosa?

Loose connective tissue

Oral mucosa may be attached to what underlying structures?

Bone or muscle

Oral mucosa structure varies according to what?

Function

What are the three types of oral mucosa?

Masticatory, lining, and specialized mucosa

Where is masticatory mucosa found?

Gingiva and hard palate

What type of epithelium does masticatory mucosa have?

Keratinized

Where is lining mucosa found?

Lips

cheeks

vestibular fornix

alveolar mucosa

floor of mouth

soft palate

What type of epithelium does lining mucosa have?

Non-keratinized

Where is specialized mucosa found?

Dorsum of the tongue

What structures are part of specialized mucosa?

Taste buds

What type of epithelium does specialized mucosa have?

Keratinized

masticatory mucosa =

lining or reflecting mucosa =

specialized mucosa=

keatinanised or non?

1. keratinized

2. non-keratinized

3. keratinized

What is one function of oral mucosa?

Defense or protection

What does oral mucosa protect against?

Oral environment

Oral mucosa protects what deeper structures?

Deeper tissues

Oral epithelium adapts to what mechanical forces?

Compression

Oral epithelium adapts to what mechanical forces?

Stretching

Oral epithelium adapts to what mechanical forces?

Abrasion

Oral mucosa acts as a barrier to what?

Microorganisms

What is another function of oral mucosa?

Lubrication or secretion

What provides lubrication in the oral cavity?

Saliva

What glands produce saliva?

Salivary glands

What does saliva prevent?

Drying of oral cavity

What sensory functions does oral mucosa have?

Temperature

What sensory functions does oral mucosa have?

Touch

What sensory functions does oral mucosa have?

Pain

Where is taste located?

Tongue (taste buds)

What are the two main tissue components of oral mucosa?

Oral epithelium and lamina propria

What type of epithelium is oral epithelium?

Stratified squamous epithelium

What is the lamina propria?

Underlying connective tissue layer