What are rhombomeres?

In the vertebrate embryo, a rhombomere is a transiently divided segment of the developing neural tube, within the hindbrain region (a neuromere) in the area that will eventually become the rhombencephalon. In human embryonic development, the rhombomeres are present by day 29.

What type of cells gives rise to rhombomeres during embryogenesis?

ProRhA gives rise to two rhombomeres, rhombomeres 1 and 2 (r1 and r2), as well as to crest cells that migrate into the first pharyngeal arch, including the trigeminal ganglion. ProRhB develops into r3 and r4 and produces crest cells populating the second arch and acousticofacial ganglion.

How many rhombomeres are there?

As many as eight rhombomeres have been described, and these are denoted r1, r2, r3, and so on from rostral to caudal (Fig. 3). The second through sixth rhombomeres (r2–r6) are similar in length and readily visible in most species.

How many rhombomeres are found within the Rhombencephalon?

Currently, eleven rhombomeres have been identified, being rh11 the most caudal and rh1 the most rostral. Rostral to rh1 is the isthmic region (also known as rh0). The part of the rhombencephalon that spans from rh11 to rh4 is usually known as medulla oblongata (or myelencephalon).

Where are the rhombomeres located in the brain?

The brain stem is subdivided into rhombomeres, and the paraxial mesoderm is substructured into somites. The rhombomeres in the hindbrain emerge beginning with the six somite (6s) stage and can be identified as a series of eight swellings along the neuraxis which are separated by grooves at stage 16s.

How are somites formed in the mesoderm?

Formation begins as paraxial mesoderm cells organize into whorls of cells called somitomeres. As the somite matures, the outer cells transform from mesenchymal to epithelial cells, creating a distinct boundary between individual somites.

Where is the rhombomere located in the vertebrate embryo?

(June 2011) ( Learn how and when to remove this template message) In the vertebrate embryo, a rhombomere is a transiently divided segment of the developing neural tube, within the hindbrain region (a neuromere) in the area that will eventually become the rhombencephalon.

Which is a property of the rhombomere cell?

One cellular property is the ability of cells of the wall of the rhombomere to bind specific lectins. Blood vessels first enter the hindbrain in the region of the floor plate soon after the emergence of the motor axons and spread within the interrhombomeric junctions.