Salivary glands are good examples of exocrine (i.e.,ducted) glands. There are major and minor types, and you willsee some of both in this lab.
Returning to the tongue slide, you probably will see some of thelingual salivary glands that are embedded in the mass of thetongue, with short ducts leading to the surface. These areminor salivary glands.
Slide 27 shows a sublingual gland, one of the majortype. Although this gland is generally mucous in most species,it's mixed in carnivores (the slide is from a dog) having both mucousand serous portions. Be sure you can tell which is which! This particular specimen shows a good deal of lymphocyticinfiltration, which is not normally present. There is a verylarge artery/vein/nerve/lymphatic complex in one portion of theslide, and several large ganglia, which most likely are involved incontrolling the gland's secretion.
Slide 28 shows two major salivary glands: the parotid andthe mandibular. The parotid is usually purely seroussecreting. The duct system in this gland is very prominent,especially the striated ducts. These striated ducts empty into largedrainage ducts which are lined with stratified cuboidal oreven stratified columnar epithelium. A few of the verysmall intercalated ducts can also be seen, connecting thesecretory units with the striated ducts. In the mandibulargland, the situation is somewhat more complex; this is a mixed gland,with serous demilunes, but it's predominantly mucoussecreting. The ducts are also prominent in this gland.
Lastly, examine slide 116. This is a tonsil from theoral cavity. Strictly speaking, this is a lymphatic organ, butit's included here because of its location. The juxtapositionof stratified squamous epithelium and lymphatic tissue ischaracteristic of tonsils, and enables them to be identified inmicroscopic sections. The stratified squamous epithelium is, ofcourse, the lining of the oral cavity.