ANHB2214 Study Guide - Final Guide: Lingual Papilla, Simple Squamous Epithelium, Lamina Propria
3 Jun 2018
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The Oral Cavity:
• Borders → lips in front, cheeks to side, hard/soft palate above, tongue
below, pharynx behind
• Lined with oral mucosa → unkeratinized simple squamous epithelium
with a lamina propria but no muscularis layer
• Skeletal muscle underlies a submucosa over most of the mouth, except for
hard palate
• Epithelium becomes keratinized in several locations prone to abrasion
• Salivary glands
o Many small salivary glands lie in submucosa → e.g. cheeks and lips
o Can be serous, mucous or mixed
o Serous → secrete waters, protein-rich fluid
o Mucous → similar to goblet cells
o Serous secretory units → acinar → products secreted by
myoepithelial cells
o Mucous secretory units → irregular in shape, branching tubular
form
o Mixed units → mucous cells near duct, cap of serous cells at distal
tip
o 3 pairs of major salivary glands → paratod, submandibular,
sublingual → external to oral cavity
o Enlarge to form striated/secretory ducts → lined with cuboidal to
columnar cells, filled with mitochondria
o Striated ducts → most prominent in submandibular gland
o Least prominent in sublingual gland
o Striated appearance due to mitochondria lining up
• The tongue:
o Muscular organ with skeletal muscle
o Anterior 2/3 → mobile tongue/body
o Posterior 1/3 → base/root of tongue
o 2 sections separated by large circumvallate papillae
o Anterior dorsal part covered in papillae → contain most taste buds
o Papillae → mucosal structures with bulging core of lamina propria
covered with keratinized epithelium
o Ventral anterior surface → covered in typical oral mucosa
o Posterior tongue → unkeritanized with no papillae
o Has extensive lingual tonsils → arranged around crypts
• Types of papillae
o Filiform
▪ Most abundant
▪ Flame shaped
▪ Highly keratinized
▪ Make surface of tongue rough to help keep it from slipping
across hard palate
o Fungiform
▪ Somewhat larger
▪ Rounder
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