Development of mouth cavity and salivary glands

Mouth cavity:

  1. Floor of foregut (Endoderm)
  2. Stomodeum (Ectoderm)

Inbetween is Buccopharyngeal membrane which ruptures at end of 3rd week

Image result for development of mouth cavity


 

Salivary glands

1. Parotid gland: Ectodermal

  • Ectodermal groove appears behind angle of mouth
  • Closes to form parotid duct
  • Branches repeatedly and canalizes to form acini
  • Duct recedes from angle of mouth
  • Opens in vestibule, opposite maxillary 2nd molar

2. Submandibular gland: Endodermal

  • Endodermal groove appears between tongue and gums
  • Closes to form submandibular duct
  • Branches repeatedly and canalizes to form acini
  • Anterior end of duct proceeds forwards , and opens close to frenulum of tongue

3. Sublingual gland: Endodermal

  • Arise as small buds from submandibular groove
  • Attain common sheath
  • Several openings in floor of mouth

 

Clinicals:

  1. Cyst formation
  2. Agenesis (failure to develop) of gland
  3. Atresia (no canalization) of duct

 

 

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