Have you seen the parietal watch?

Gray976.png


Gray976.png
Courtesy of Wikimedia Foundation, Inc.

Section of lung of pig embryo, 13 cm. long, showing the glandular character of the developing alveoli (J. M. Flint.) X 70. a. Interstitial connective tissue. b. A bronchial tube. c. An Alveolus. l. lymphatic clefts. q. Pleura.
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