Search results
Results from the WOW.Com Content Network
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 ...
In many species, the body shape and fin rays, as well as the ability to move and feed, develops most rapidly during the flexion stage. Juvenile stage Starts with all the fin rays being present and scale growth underway, and completes when the juvenile becomes sexually mature or starts interacting with other adults.
Notochord flexion occurs at around 4 mm standard length in R. loricata. [1] Species. The currently recognized species in this genus are: [2]
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]
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.
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 ...
Cells in this area, known as medial hinge point cells because of their involvement with this structure, are stabilized and connected to the notochord. They are derived from the area of the neural plate anterior to primitive knot. The notochord will begin the shape changes in MHP cells. These cells will decrease in height and become wedge-shaped.
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.