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Red: notochord; Magenta: axochord; Green: nerve chord; Blue: epidermis; Yellow: mesoderm. The notochord is an elastic, rod-like structure found in chordates. In chordate vertebrates the notochord is an embryonic structure that disintegrates, as the vertebrae develop, to become the nucleus pulposus in the intervertebral discs of the vertebral ...
The notochord plays an integral role in the development of the neural tube. Prior to neurulation, during the migration of epiblastic endoderm cells towards the hypoblastic endoderm, the notochordal process opens into an arch termed the notochordal plate and attaches overlying neuroepithelium of the neural plate. The notochordal plate then ...
In acanthuridae, the pelagic, pre-juvenile stage larvae can reach lengths of 60 mm before settling in their habitat. The Moorish idol’s various larval stages have been described and illustrated. The preflexion larval stage refers to the stage from hatchling to the start of upward flexion of the notochord. [14]
It was seen in an experiment that without the notochord, the MHP characteristics did not develop correctly, so the neural plate and neural tube formation did not happen properly. [6] The communication between the neural plate and the notochord is important for the future induction and formation of the neural tube.
Axial mesoderm, or chordamesoderm, is the mesoderm in the embryo that lies along the central axis under the neural tube.. will give rise to notochord; starts as the notochordal process, whose formation finishes at day 20 in humans.
In this way the notochord can be characterized as a hydrostatic organ. [1] During muscle contraction, the notochord also plays an important role in withstanding shortening of the body. [10] The dorsal nerve cord is located behind the notochord. The pharynx is another structure made from cartilage for feeding, found near the throat.
Both Shh and HNF-3b transcripts are found in the notochord and the floor plate rostral to the node, and they are completely absent in the lateral and caudal neural plate and the primitive streak. In the node proper, the chordin expression pattern is very similar to that of HNF-3b, but more rostrally, chordin is no longer expressed in the floor ...
In the 10 somite embryo, Carnegie No. 5074, the prechordal plate is continuous posteriorly with the notochord, and is made up of about 35-40 cells. The prechordal mesenchyme proliferates laterally over the junction of the dorsal aorta and first aortic arch on each side.