Carnegie Stage 12 Definition

Age is approximately 26 postovulatory days

Length is approximately 3-5 mm

External Features Include: a characteristic curved posture, three pharyngeal arches are visible, the caudal neuropore is closing or closed; the otic vesicles are almost closed but not detached; the upper limb buds are beginning to appear.

 

(O'Rahilly R and Muller F [1987] Developmental Stages in Human Embryos. Carnegie Institute, Washington, Publication no. 637)

 

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