WHICH TISSUE IS THIS? – 2
This image is a larger magnification of a region similar to that outlined in the figure on the WHICH TISSUE IS THIS? – 2
This image is a larger magnification of a region similar to that outlined in the figure on the previous page.
Once again, the three regions are present.
The upper region is empty, probably a body cavity or the external surface of the body.
The middle layer is well stained, contains many cells, considering the amount of nuclei that can be seen.
The lower layer has fewer cells, judging by the small amount of nuclei. The cells are separated from each other by an extracellulr space that contains a filamentous structures.
This image is a larger magnification of a region similar to that outlined in the figure on the previous page.
Once again, the three regions are present.
The upper region is empty, probably a body cavity or the external surface of the body.
The middle layer is well stained, contains many cells, considering the amount of nuclei that can be seen.
The lower layer has fewer cells, judging by the small amount of nuclei. The cells are separated from each other by an extracellulr space that contains a filamentous structures.
Are these two layers composed of the same type of tissue, or do they represent different types of tissue?
A more detailed analysis of these regions is provided below.
| Main features of the layer | Middle layer with many cells | Lower layer with separated cells |
| Does it coat some structure? | yes, it coats some other tissue | no |
| Do their cells stand closely together? | yes | No, they are separated from each other. |
| Extracellular material? | not visible | yes, a lot |
| Does it have blood vessels? | no | yes |
The middle region shows many characteristic features of covering epithelial tissue, whereas the lower region has the typical features of connective tissue.
This arrangement is typical because covering epithelial tissue is supported by underlying connective tissue.