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  2. Face and neck development of the human embryo - Wikipedia

    en.wikipedia.org/wiki/Face_and_neck_development...

    The face and neck development of the human embryo refers to the development of the structures from the third to eighth week that give rise to the future head and neck.They consist of three layers, the ectoderm, mesoderm and endoderm, which form the mesenchyme (derived form the lateral plate mesoderm and paraxial mesoderm), neural crest and neural placodes (from the ectoderm). [1]

  3. Fetal head - Wikipedia

    en.wikipedia.org/wiki/Fetal_head

    The suboccipitobregmatic (9.5 cm), which follows a line drawn from the middle of the large fontanel to the undersurface of the occipital bone just where it joins the neck; The greatest circumference of the head, which corresponds to the plane of the occipitofrontal diameter, averages 34.5 cm (13.6 in), a size too large to fit through the pelvis ...

  4. Human embryonic development - Wikipedia

    en.wikipedia.org/wiki/Human_embryonic_development

    At the beginning of the ninth week, the embryo is termed a fetus (spelled "foetus" in British English). In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs. Human embryology is the study of this development during the first eight weeks after fertilization.

  5. Pharyngeal pouch (embryology) - Wikipedia

    en.wikipedia.org/wiki/Pharyngeal_pouch_(embryology)

    The third pouch possesses dorsal and ventral wings. Derivatives of the dorsal wings include the inferior parathyroid glands, while the ventral wings fuse to form the cytoreticular cells of the thymus.

  6. Meckel's cartilage - Wikipedia

    en.wikipedia.org/wiki/Meckel's_cartilage

    Meckel's cartilage is a piece of cartilage from which the mandibles (lower jaws) of vertebrates evolved. Originally it was the lower of two cartilages which supported the first branchial arch in early fish.

  7. Cervical sinus - Wikipedia

    en.wikipedia.org/wiki/Cervical_sinus

    The cervical sinus is a structure formed during embryonic development.It is a deep depression found on each side of the neck.It is formed as the second pharyngeal arch (hyoid arch) grows faster than the other pharyngeal arches, so they become covered.

  8. Maxillary prominence - Wikipedia

    en.wikipedia.org/wiki/Maxillary_prominence

    Human embryo from thirty-one to thirty-four days Under surface of the head of a human embryo about twenty-nine days old. The head and neck of a human embryo thirty-two days old, seen from the ventral surface.

  9. Fetal movement - Wikipedia

    en.wikipedia.org/wiki/Fetal_movement

    An embryo of a gestational age of 9 weeks and 0 days. The head is directed to the right in the image. The heart is discerned in the center of the embryo. A hand is visible slightly above. Even before the fetal stage begins, a six-week-old human embryo can arch its back and neck. [6]