| Lab 18 Oral Cavity and Salivary Glands: 1) Index 2) Introduction 3) Things to Identify 4) Hard Palate 5) Soft Palate 6) Tonsils 7) Tongue 8) Parotid Glands 9) Submandibular Glands 10)Sublingual Glands 11) Comparison of Structures 12) Practical |
| The Submandibular Gland |
| # 103 - Submandibular gland, monkey, 1.5 mm, h-e |
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Identify the secretory units (acini). Find the serous cells and the mucous cells as shown in Fig. 4, p. 283 in Gartner or Fig. 5.28 in Wheater. Find serous demilunes. Note the predominance of serous-secreting acini in the submandibular gland. Identify the branches of the duct system. There are two general classses of exocrine ducts: intralobular, that is, ducts located within the lobule, and interlobular, ducts located between the lobules. In several types of exocrine glands there are two subclasses of intralobular ducts, intercalated ducts and secretory ducts. The latter are also called striated ducts because of the longitudinally arranged striations at the basal part of the cells. At the ultrastructural level these striations are seen to be infoldings of the basal cell membrane with mitochondria located within these folds. In this slide find examples of intercalated ducts. These will have a diameter approximately equal to the diameter of the secretory acinus and will be lined with a flattened or cuboidal epithelium. The secretory (striated) ducts are larger in size and are usually lined with a simple columnar epithelium. The interlobular ducts are the largest ducts in the gland. They are located in the connective tissue that separates the gland into lobules and are lined with either stratified columnar or pseudostratified columnar epithelium. With the help of your atlas locate examples of interlobular ducts in the submandibular gland. REFERENCE: Gartner, p. 43, Fig. 4p. 303, Fig. 4Ross, p. 430 - 431 p. 283, Fig. 4 Wheater, p. 244, Fig. 13.14 DiFiore, p. 167. Fig. 11.13 |
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This is a low power image of the Submandibular Gland. The blue arrows are outlining the Lobules of the gland. The submandibular gland is made up of both Mucous and Serous Secreting cells. So the over all color of the gland will be dark and light patches because of the dark color of the serous cells and light color of the mucous cells.
Blue arrows - Submandibular Lobules
Here is a closer look at the make up of the gland. The red dotted lines are out lining the Serous and Mucous Acini, that make up the gland. The green arrows are pointing to the light colored Mucous cells. Notice the colors of both the light mucous cells and dark serous schools. The blue arrow is pointing to a Intralobular (Striated) duct. Intercalated ducts are also found in the gland but not in this image. Red dotted lines - Serous and Mucous Acini Green arrow - Mucous Cells Blue arrow - Striated duct
This is a high power shot of the cells of the gland. The blue arrows are pointing to the Serous cells. At this magnification you can even make out the Granules that fill up the cell and give it it's dark red color. Yellow arrow is pointing to Mucous cells. The red arrow is pointing to a Intralobular or Striated duct. Red arrow - Striated duct Blue arrow - Serous Cells Yellow arrow - Mucous cells
This is an image of what are know as Serous Demilunes. These are composed of a Mucous cell (red arrow) capped on top with a Serous cell (blue arrow). The serous cell looks like a half moon against the mucous cell, hence the name serous demilune. Blue arrow - Serous Cell Red arrow - Mucous Cell
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Submandibular Gland
Submandibular Gland (serous and mucous acini)
Serous and Mucous cells
Serous Demilune |
