作者: David F. Lobach , Lucinda L. Hensley , Winifred Ho , Barton F. Haynes
DOI: 10.1007/978-1-4613-8587-5_32
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摘要: During early fetal ontogeny, the thymic rudiment is formed by a combination of mesodermal, endodermal, and ectodermal elements (1–4). Between 9 10 weeks gestation, human epithelial thymus colonized blood-borne T cell precursors (3–6). Cortical-medullary partitioning occurs at 14–15 gestation Hassall’s bodies, keratinized swirls in medulla, first appear 15–16 Thus 16 architecture resembles morphology postnatal