Which tissues are categorized as dense tissue in vacuum infiltration?

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Multiple Choice

Which tissues are categorized as dense tissue in vacuum infiltration?

Vacuum infiltration is used to push embedding medium into tissues that are tightly packed and have limited interstitial space. When tissue structure is dense, air pockets or a compact cellular matrix can impede penetration, so applying suction helps the medium flow into the deepest parts and prevents incomplete infiltration. Uterus and brain fit this scenario. The uterus has a thick myometrial wall made of densely packed smooth muscle fibers and connective tissue, which makes it a dense tissue that benefits from vacuum-assisted infiltration. Brain tissue, with its tightly organized neural networks and limited extracellular space, also presents diffusion barriers that vacuum infiltration helps overcome, ensuring uniform penetration of the infiltrant. In contrast, tissues with more open architecture or abundant air spaces and vascular/loose connective tissue—such as lung, placenta, spleen, and lymph nodes—are not classified as dense for this purpose, because their structure allows easier infiltrant access without the same need for suction-enhanced penetration.

Vacuum infiltration is used to push embedding medium into tissues that are tightly packed and have limited interstitial space. When tissue structure is dense, air pockets or a compact cellular matrix can impede penetration, so applying suction helps the medium flow into the deepest parts and prevents incomplete infiltration.

Uterus and brain fit this scenario. The uterus has a thick myometrial wall made of densely packed smooth muscle fibers and connective tissue, which makes it a dense tissue that benefits from vacuum-assisted infiltration. Brain tissue, with its tightly organized neural networks and limited extracellular space, also presents diffusion barriers that vacuum infiltration helps overcome, ensuring uniform penetration of the infiltrant.

In contrast, tissues with more open architecture or abundant air spaces and vascular/loose connective tissue—such as lung, placenta, spleen, and lymph nodes—are not classified as dense for this purpose, because their structure allows easier infiltrant access without the same need for suction-enhanced penetration.

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