Histology of Tissues in the Oral and Nasal Cavity

Papillae.

What are the small outgrowths of the tongue called?

Stratified squamous epithelium.

(Keratinisation depends on species)

What type of epithelium is always found in the oral cavity?

Upper surface of the tongue.

Where are papillae mainly located on the tongue?

-Filiform = thread-like projections or bear spines

-Circumvallate, fungiform = Cushion-shaped

-Foliate = successive folds

Describe the different structures of papillae

Epithelium

Where are tastebuds found in the tongue?

1 = Alveolar bone

4 = Dental papillae

3 = Dental lamina

5 = Dental sac

12 = Outer enamel epithelium

17 = Stellate reticulum

Label this slide of the canine developing permanent tooth

1 = Alveolar bone

4 = Blood vessel

5 = Cementum

9 = Dentin

13 = Fibre bundle

17 = Precementum

Label this canine tooth segment

Stratified squamous epithelia with mucous glands (except in carnivores where the glands are mixed).

What epithelium lines the oropharynx?

-External muscularis layer (skeletal muscle)

--Surrounded by adventitia

Describe the structural layers of the oropharynx

2 = Ameloblasts

6 = Dental papillae

8 = Dental sac

9 = Dentine

15 = Odontoblasts

16 = Outer enamel epithelium

19 = Space artifact

20 = Stellate reticulum

Label this slide of the developing permanent tooth of a dog

2 = Ameloblasts

6 = Dental papilla

9 = Dentine

10 = Enamel

15 = Odontoblasts

18 = Precementum

19 = Space artifact

Label this slide of the dentioenamel junction of a developing permanent tooth in a dog

A = Osteon

B = Odontoblasts

What are these structures found in the tooth?

A = Rete pegs

B = Stratified squamous epithelium

C = Lamina propria

Label this slide from a dog permanent tooth

A = Arteriole

B = Lymph duct

C = Venule

D = Nerves

Label this slide of a dog permanent tooth

3 = Attachment epithelium

7 = Dental pulp

9 = Dentine

11 = Enamel space

12 = Free gingiva epithelium

14 = Lamina propria

15 = Odontoblasts

Label this slide from an upper deciduous tooth of a dog

-Collagen fibres

-Blood vessels

-Lymph vessels

-Nerves

-Mostly fibroblast cells

Describe the histological structure of the periodontal ligament

2 = Caudal connective tissue of papilla

3 = Rostral connective tissue of papilla

7 = Skeletal muscle

9 = Spine

Label this feline tongue

-Skeletal muscle

-Lingual glands

-Stratified squamous epithelium

What tissue layers are in the tongue?

1 = Connective tissue of papillae

4 = Projection of fuliform papilla

Label this horse tongue

6 = Nucleus of sensory cell

10 = Stratum spinosum

11 = Supporting cell (spore)

12 = Taste pore

Label this section of a taste bud from a horse

4 = Projection of filiform papilla

5 = Core of fungiform papilla

7 = Skeletal muscle

8 = Small papilla

Label this goat tongue

Circumvallate papilla

1 = Core of connective tissue

2 = Connective tissue

3 = Duct

4 = Lingual salivary gland

5 = Stratified squamous epithelium

6 = Taste buds

Label this goat tongue stating what papilla type it has

3 = Epithelium of filiform papilla

9 = Longitudinal skeletal muscle

10 = Transverse skeletal muscle

11 = Vertical skeletal muscle

Label this feline tongue

1 = Adipose tissue

8 = Mucous glands

12 = Serous gland

13 = Skeletal muscle

Label this tissue segment of a horse

-Serous nature

-Compound serous gland

What is the secretory nature of the lingual glands? What type of gland are the lingual glands?

Always simple cuboidal (except in reproductive system).

What type of epithelium lines glandular ducts?

Butterfly (:

What does a cross-section of a tongue typically look like?

A = Filiform papillae (large keratinisation, especially in caudal)

B = Foliform papilla

C = Skeletal muscle fibres running in many directions

D = Dense irregular connective tissue

Label this feline tongue

A = Nerve

B = Artery

Label this segment from the feline tongue

Dorsal.

Is the surface with papillae of the tongue on dorsal or ventral?

No.

Does the ventral aspect of the tongue have papillae?

-Keratinised on both

-Thinner on ventral aspect

Describe the epithelial lining of the dorsal and ventral aspects of the tongue

Lingual frenulum.

What connective tissue structure holds the tongue to the mouth ventrally?

1 = Diffuse lymphatic tissue

3 = Fossa semilunar fold

4 = Lymphatic nodule

7 = Salivary glands

11 = Stratified squamous epithelium of semilunar fold

12 = Stratified squamous epithelium of tonsil

Label this canine palatine tonsil

A = Lingual frenulum

B = Dense irregular connective tissue

Label this section of the tongue

5 = Mucous acinar gland

8 = Serous acinar gland

9 = Serous demilune

Label this section of a canine palatine tonsil

3 = Crypt

5 = Diffuse lymphatic tissue

7 = Lymphatic nodule

11 = Subscapular sinus

Label this equid palatine tonsil

Base of the tongue and the dorsal aspect of the soft palate.

What is the anatomical location of the palatine tonsil?

Secondary lymphoid organ.

What type of structure is the palatine tonsil?

A = Mantle

B = Germinal centre

Label this section from the palatine tonsil

Compound tubular mucous secretory glands. Skeletal muscle surrounds them.

What glands are shown here? What is their shape? What tissue surrounds the glands?

4 = Mucous acinus

6 = Serous acinus

7 = Serous demilune

8 = Striated duct

Glands are mixed compound.

Label this dog submandibular gland

2 = Intercalated duct

4 = Mucous acinus

7 = Serous demilune

8 = Striated duct

Label this sheep submandibular gland

3 = Interlobar connective tissue

6 = Serous acinus

8 = Striated duct

Label this dog parotid gland

Serous secretory in nature.

What is the primary secretion nature of the parotid gland?

2 = Bone

5 = Cavernous vein

7 = Nasal cavity

9 = Pseudostratified

Label this portion of the dog nasal concha

A = Bony septum

B = Nasal conchae

Hyaline cartilage.

What connective tissue is likely to be found in the septum of the nose?

Pseudostratified ciliated columnar epithelium.

What type of epithelium lines the respiratory system? (And hence the nasal cavity)

A = Pseudostratified ciliated columnar epithleium

B = Simple tubular mucous glands

C = Blood vessel

D = Hyaline cartilage

Label this section from the nasal cavity

A = Mesenchyme cells

B = Bone matrix (uncalcified)

Label this section of a nasal conchae

Woven bone.

What type of bone is found in the nasal conchae?

A = Blood vessels

B = Nasal concha

Label this section of the nasal cavity

A = Pulp (in pulp cavity)

B = Dentine

C = Cementum

Label this section from the nasal cavity