What is the definition of stroma in the context of tissue structure?

In the context of tissue structure, stroma refers to the supportive connective tissues and blood vessels found within an organ. This term encompasses all the non-functional, supportive elements that provide a framework for the functional components, or parenchyma, of the organ. Stroma is essential for maintaining the structure and integrity of tissues, as it not only houses blood vessels that supply nutrients and oxygen but also provides support and protection for the functional cells.

Understanding stroma as the supportive connective tissue allows for a clearer distinction between it and the parenchyma, which is responsible for the specific functions of the organ. For instance, in the case of a gland, the stroma will include the connective tissues and vessels that support the gland's function but do not participate directly in the secretion of hormones or enzymes. This knowledge is crucial for grasping how tissues are organized and how they function collectively within various organ systems.