![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Compound tubuloacinar gland
The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x
![Mucus-secreting tubules <p>The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-1-ping.png)
Mucus-secreting tubules
The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x
![- Nuclei of mucous cells <p>The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-2-ping.png)
- Nuclei of mucous cells
The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x
![- Mucin granules <p>The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-3-ping.png)
- Mucin granules
The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x
![- Tubule lumens <p>The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-4-ping.png)
- Tubule lumens
The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x
![Serous-secreting acini <p>The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-5-ping.png)
Serous-secreting acini
The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x
![- Nuclei of serous cells <p>The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-6-ping.png)
- Nuclei of serous cells
The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x
![- Secretory granules <p>The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-7-ping.png)
- Secretory granules
The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x
![- Acinar lumens <p>The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-8-ping.png)
- Acinar lumens
The morphology of serous and mucous secretory units is demonstrated in this image. Each serous unit is acinar with a narrow lumen and contains cells with secretory granules and spherical nuclei. Each mucous unit is tubular with a wide lumen. The secretory cells appear vacuolated, with nuclei flattened at the base of the cell. Submandibular gland 1000x
![Serous demilunes > <p>Serous demilunes are crescent-shaped units of serous-producing cells capping the ends of tubules. Secretions from the demilune drain into the tubule lumen.</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-9-ping.png)
Serous demilunes >
Serous demilunes are crescent-shaped units of serous-producing cells capping the ends of tubules. Secretions from the demilune drain into the tubule lumen.
![Intralobular ducts > <p>The portion of the intralobular duct indicated by the rectangle shows the very initial region of the duct at the termination of the tubule.</p>](https://digitalhistology.org/wp-content/uploads/2017/06/T.E.Gl_.Ex_.Comp-16-10-ping.png)
Intralobular ducts >
The portion of the intralobular duct indicated by the rectangle shows the very initial region of the duct at the termination of the tubule.