http:www'lab'anhb'uwa'edu'aumb140 - PowerPoint PPT Presentation

Title: http:www'lab'anhb'uwa'edu'aumb140


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http//www.lab.anhb.uwa.edu.au/mb140/
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The Oral Cavity - Tongue

• Jam 38  
• But the tongue can no man tame it is an unruly
  evil, full of deadly poison.
• The tongue, although a small organ is very hard
  to control.
• Tongue is also a great organ to see lots of
  tissues in.

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Tongue

• Perhaps one of the reasons the Bible says the
  tongue is hard to control is because of the
  arrangement of muscles in it.
• It has striated muscles that run in three
  directions, across, back and forth, and up and
  down

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Skeletal muscle in tongue runs in three different
directions
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Tongue

• Tongue functions in
• Movement during mastication or chewing of food
• Swallowing of food.
• Mixing food with saliva
• Perception of taste sweet, sour, bitter, salty
• Speech

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Tongue

• Taste buds are located on the sides of the
  circumvalate papillae.
• These contain specialized cells which pick up the
  dissolved substances and create stimulations in
  special cells within the taste buds
• Taste buds are washed with secretions from the
  Von Ebners glands located beneath them.

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Circumvalate papillae of tongue
von Ebners glands
Skeletal muscle
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Taste buds
Von Ebners glands
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Taste buds associated with circumvalate papillae
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Tongue

• Taste buds are located on the sides of the
  circumvalate papillae.
• These contain specialized cells which pick up the
  dissolved substances and create stimulations in
  special cells within the taste buds
• Taste buds are washed with secretions from the
  Von Ebners glands located beneath them.
• Anterior lingual glands may be found in the floor
  of the tongue.

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Tongue

• Tongue contains both glands that are serous and
  mucous in nature.
• Mucous cells appear hollow, very pale in color,
  and the nucleus is pressed against the cell
  membrane.
• Serous cells stain more intensely and have
  rounded, more centrally located nuclei.

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Mucous glands
Serous glands
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Salivary Glands

• Three types of salivary glands are the
• Parotid largest salivary gland, located between
  ears and mouth. It is entirely serous (stains
  dark)
• Submaxillary or submandibular is a mixed gland
  located under the mandible and maxilla.
• Sublingual glands are mixed glands in man and
  located under the tongue.

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Glands

• Glands in Oral Cavity are the Compound
  Tubuloacinar type.
• They consist of a secretory part (the acini) and
  a series of ducts that carry the secretion.
• Intercalated ducts are the smallest with an
  individual acini empting into it.
• Multiple intercalated ducts merge to form
  striated ducts which merge to form interlobular
  ducts.

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Glands

• Serious glands often produce digestive enzymes
  like salivary amylase. These cells usual look
  like normal cells and often stain dark.
• Mucous glands secrete mucous substances. These
  substances often compress the nucleus very
  tightly against the basal part of the cell and
  the cells are light and often appear hollow.
• Mixed glands contain both types of acini.

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Sublingual gland with many mucous cells nucleus
flattened against cell membrane.
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Submandibular gland contains both serous and
mucous acini.
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Parotid gland striated ducts
Intercalated duct
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Odontoblasts secrete the uncalcified dentin and
the amelioblasts Secrete the hardened enamel.
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Liver tissue low magnification. Basic unit is
hepatic lobule, Note portal triads (bile duct,
hepatic artery and portal vein) and central
veins. Hepatic lobule has portal triads as
boundries.
Plates of hepatic cells
Portal triads
Central vein
Hepatic lobule
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Portal area or portal triad consists of Bile
duct, hepatic artery and portal vein.
Hepatic artery
Bile duct
Plates of hepatic cells
Portal vein
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Liver lobule showing central vein, sinusoids, and
plates of hepatic cells
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Kupffer cells filled with carbon after
phagocytosis of it from blood.