Anatomy and Cell Biology 3309 Lecture Notes - Lecture 4: Lingual Papilla, Dermis, Lamina Propria
15 May 2018
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Lecture 4 – Tongue, Salivary Glands
- Salivary glands have different locations and are named according to their location
Tongue
- Divided into symmetrical structures
- Median sulcus: mid line of the tongue
- Lingual papillae: there are projections coming off the surface of the tongue
o Papillae come in different sizes and shapes
- Circumvallate papillae:
o Most obvious papillae are in the back of the tongue
o Large bumps that show up in a V-formation
- Foliate papillae: at the edge of tongue at the back; there are ridges
- Fungiform papillae: on the remaining surface; tiny bumpy mushroom formed
- Filliform papillae: tiny papillae that are hard to see – finger-like protrusions
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Section of inside of the tongue
- Higher magnification image part of the epithelium that covers the surface
o Under the tongue there is also a surface and there is not much of a difference except
that the papillae are ONLY found on the upper surface
o Papillae are not found on the lower surface
- Epithelium: stratified squamous
o There is loose CT (lamina propria) and dense CT underneath
- Vast majority of the body of the tongue is made of skeletal muscle (we are in control of our
tongue)
o Skeletal muscle runs in various different planes in a section (obliquely, cross,
longitudinally)
- There is a lot of innervation in the tongue
o Many small peripheral nerves are found that innervate the tongue
Lingual papillae
- Surface of the tongue is covered by lingual papillae
- Filiform papillae:
o Conical structures
o Epithelium over top the papillae is highly keratinzed
o Function: mechanical grip
o No taste buds
o E.g. cats have a lot of filiform papillae because they lick food and meat off of bones
- Fungiform papilla:
o Round blunt ending
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o Are visible with the naked eye (but must look very closely)
o CT underneath forms 3 dermal papillae reaching into the fungiform papilla
o Mushroom shaped (looks like a young mushroom before it forms a cap)
o Dorsal taste buds (on the upper surface)
o Function: detection of taste
Lingual papilla – foliate papillae
- At the back of the tongue at the lateral edges, there are grooves (arrows) and the surface is
flat in contrast to fungiform papilla which have a dome, round surface
- Indentation at the edge is bordered by lots of taste buds
- When you taste food, you preferentially taste it at the tip of your tongue or at the back
- Taste receptors are specialized to taste bitter taste
o If you taste something bitter, you get the sensation first at the back of your tongue in
the foliate papillae
- PAPELLAE disappears with age
- Important in detecting taste
- Foliate papillae:
o Flat
o At the back of the tongue
o Parallel ridges
o Lateral edge of tongue
o Many lateral taste buds
o Large accumulation of taste buds
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Salivary glands have different locations and are named according to their location. Median sulcus: mid line of the tongue. Lingual papillae: there are projections coming off the surface of the tongue: papillae come in different sizes and shapes. Circumvallate papillae: most obvious papillae are in the back of the tongue, large bumps that show up in a v-formation. Foliate papillae: at the edge of tongue at the back; there are ridges. Fungiform papillae: on the remaining surface; tiny bumpy (cid:523)(cid:498)mushroom formed(cid:499)(cid:524) Filliform papillae: tiny papillae that are hard to see finger-like protrusions. Epithelium: stratified squamous: there is loose ct (lamina propria) and dense ct underneath. Vast majority of the body of the tongue is made of skeletal muscle (we are in control of our tongue: skeletal muscle runs in various different planes in a section (obliquely, cross, longitudinally) There is a lot of innervation in the tongue: many small peripheral nerves are found that innervate the tongue.
