Salivary & Lymphatic

Question 1

Development of Lymph Nodes

Answer 1

LEC migrate from blood vessels
Aggregate to form lymph sacs with mesenchyme
Form lymph nodes
Nodules become surrounded by sinuses with mesenchyme completing the lymph node
Lymphatic cells migrate from mesenchyme, thymus, and bone marrow
A capsule and trabeculae surround the lymphatic nodules from surrounding mesenchyme

Question 2

What are tonsils and their features? Histology?

Answer 2

Aggregates of un encapsulated lymphatic tissue
Covered in nonkeratinized stratified squamous epithelium
Form tonsilar crypts

Question 3

What are the 4 tonsils of the tonsilar ring?

Answer 3

Palatine
Pharyngeal
Lingual
Tubal

Question 4

What are the 6 main salivary glands?

Answer 4

Parotid, Submandibula, Sublingual

Question 5

How is the parotid gland formed?

Answer 5

From invagination of ectoderm between the max and mand swellings
Tubular ducts sink into the mesenchyme
Duct opening in mouth is transferred to the inner surface of check during fusion of maxillary and mandibular swellings

Question 6

How are the submandilbular and sublingual glands formed?

Answer 6

Similar process in the floor of oral cavity

From epithelial-mesenchymal interactions

Question 7

Characteristics of Serrous secretions

Answer 7

Watery fluid
Enzymes (amylases, peroxidase, lysozyme)
Lactoferrin (chelates iron needed for bacterial growth)
Ig A (neutralizes bacteria and viruses)

Question 8

How does saliva differ due to stimulation/innervation?

Answer 8

Parasympathetic- thin

Sympathetic- thicker

Question 9

Characteristics of Mucous secretions

Answer 9

Thick, glycoproteins called mucins

Question 10

What are the 3 kind of salivary ducts?

Answer 10

Intercalated duct, striated, duct, excretory duct

Question 11

Intercalated Duct

Answer 11

Receives fluid from acinus

Simple cuboidal epithelium

Question 12

Striated Duct

Answer 12

Produces hypotonic saliva by reabsorbing NaCl
Secretes bicarbonate (buffer)
Manipulates saliva
Simple cuboidal to columnar epithelium

Question 13

Excretory Duct

Answer 13

Connect to mouth

simple cuboidal to columnar epithelium and occasionally stratified columnar epithelium

Question 14

Minor Salivary Glands

Answer 14

Produce lipase and lysozyme

when damaged form mucoceles

Question 15

Parotid Gland location and secretion

Answer 15

Lateral border of face and anterior to ear
Produces 25% saliva
Mainly Serous secreting, largest gland
Excretes through parotid duct and parotid papilla
Primarily serous secreting

Question 16

Submandibular gland location and secretion

Answer 16

Lateral border of the mandible
Produces 70% of saliva
Excretes through submandibular duct on sides of lingual frenulum
Secretes 50/50 Serous and mucous saliva ( More serous)

Question 17

Sublingual location and secretion

Answer 17

Below anterior portion of the tongue
Produces 5% saliva
Excretes from sublingual duct and multiple ducts on floor of mouth called Ducts of Rivinus
50/50 but mainly Mocous saliva
predominately Mucous Acini, fewer serous acini

Question 18

Salivary gland stones- Sailolithiosis

Answer 18

Calcification of clogged duct