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Introduction

Stage 15 embryos have a greatest length of 7 to 9 mm and an estimated postfertilization age of 41 days. The lens vesicle, nasal pit and hand plate are present and the future cerebral hemisphere is distinct. The stage is represented by Carnegie embryo #721. It has a greatest length of 9.0 mm (after fixation) and is median within the stage.

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New structures include anterior cerebral artery, basilar artery, endocardial cushion, esophagus, foot plate, hand plate, olfactory nerve (CN I).

Section 237

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Also on EHD: Thumb Sucking

Embryo

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Right lateral view of the embryo prior to sectioning

Right lateral view of the embryo prior to sectioning

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