Fetal lung (histological slide)


 * Fetal lungs contain significantly fewer alveoli compared to adult-type lungs, in some places they resemble a gland,
 * the base of the epithelium originates from the endoderm of the foregut ,
 * the basis of bronchioles and alveoli are terminal sacs  (they are formed by the gradual division of bronchial buds),
 * the cartilage base of the bronchi (arranged as a ring of clustered cells enveloped by the future perichondrium) and the vascular base originate fromthe mesenchyme.

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