The digestive tract starts from the oral cavity to anus & the lining epithelium of this tract are following :

# Oral cavity(lip & gum) : Keratinized stratified squamous epithelium
# Tongue – Ant.2/3rd : ”
- Post.1/3rd : Pseudo stratified ciliated columnar
epithelium
# Oropharynx : Nonkeratinized stratified squamous
epithelium
# Pharynx : ”
# Oesophagus : ”
# Stomach to the
Pectinate line of Anal canal : Simple columnar epithelium
# Pectinate line to White line
of Hilton’s line of Anal canal
(middle 15cm of anal canal) : Nonkeratinized stratified squamous
epithelium
# Lower part of Anal canal
(lower 8cm of anal canal) : Keratinized stratified squamous
epithelium