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UNSW Embryology

Endocrine Development Stage 13/14

© Dr Mark Hill (2011)

Acknowledgements

Introduction

The 2 main endocrine organs that can be seen in cross-sections of the carnegie stage 13/14 embryo are the early developing pituitary and thyroid gland. The site of the anterior pituitary is visible as Rathke's pouch. The developing Thyroid can be seen as a cluster of dark staining cells in the hypopharyngeal eminence.

For more information on the development and function of these two glands see the Pituitary and Thyroid pages.

Stage 13/14

B1: Dorsal portion of hypopharyngeal eminence. Rathke's pouch derived from ectoderm anterior to the buccopharyngeal membrane ( rudimentary adenohypophysis).

B2: Rathke's pouch. Thyroid rudiment (cords) arrowed dark spots near midline.

B3: Rudimentary thyroid ventral to aortic sac (also seen in B2, ventral to the hypopharyngeal eminence).

G7: (Close to midline in head region). Forebrain, midbrain, hindbrain (with thin roof). Arrowed Rathke's pouch. Floor of pharynx with foramen caecum (the tongue has not yet formed).

Glossary of Terms

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S |T | U | V | W | X | Y | Z

Quick Links

Endocrine Introduction | Abnormalities | Stage 13/14 Embryo | Stage 22 Embryo | Selected Sections Stage 22 Embryo | Abnormal Endocrine Development| Overview Pituitary Development | Overview Thyroid Development | Overview Adrenal Development | Overview of Pancreas Development See also GIT Notes- Pancreas |

UNSW Embryology ISBN: 978 0 7334 2609 4

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