Lung, capillaries in alveolar walls
Image from Hassall (1849), Microscopic Anatomy of the Human Body in Health and Disease
This drawing, showing capillary beds in the inter-alveolar septa of a couple dozen alveoli, comes from the first English-language textbook of microscopic anatomy, by Arthur Hill Hassall (1817-1894).
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Last updated: 15 August 2022 / dgk