Neurula embryonic development of marble newt
Neurula (from the Greek. Néuron - nerve) is one of the stages of the embryonic development of chordates , including humans. Follows the gastrula .
At this stage of embryonic development, the formation of the neural plate and its closure in the neural tube occur.
Neurulation
Early neurula is formed as a result of gastrulation and is a three-layer embryo, from the layers of which internal organs begin to form.
- Ectoderm forms the neural plate and integument epithelium.
- Mesoderm forms the primordium of the chord.
- The endoderm grows to the dorsal side of the embryo and, surrounding the gastrocoel , forms the intestine.
Middle neurula is formed during neurulation with the closure of nerve rollers.
In the final stage of neurulation (late neurula), the anterior and posterior parts of the body can be distinguished in the embryo.
Links
- V. I. Efremov “ Development of vertebrate animals (Vertebrata). Amphibian Embryogenesis "