Floor Plate Roof Plate Neural Tube Release

The floor plate is a structure integral to the developing nervous system of vertebrate organisms.

Floor plate roof plate neural tube release.

Just as the floor plate is important in ventral patterning the roof plate serves as an important organizing center for dorsal patterning along with the dorsal epidermis. The floor plate responds to shh by producing its own shh and forming a gradient. The notochord expresses shh. The roof plate is an embryonic organizing centre that occupies the dorsal midline of the vertebrate neural tube.

The roof plate of the neural tube responds to those signals by expressing more bmp4 and other transforming growth factor beta tgf β signals to form a dorsal ventral gradient among the neural tube. During early cns development the roof plate produces secreted factors which. The best described roles of the roof plate have emerged from studying it in the spinal cord region where the roof plate patterns the dorsal population of sensory neurons lee et. Despite the importance of the roof plate for normal patterning and development of the neural tube not much was known about its development or function until recently.

The roof plate forms in the dorsal midline of the developing spinal cord shortly after neural tube closure as a result of induction by bmp4 and bmp7 both secreted by the. The basal plate forms most of the ventral portion of the nervous system including the motor portion of the spinal cord and brain stem. These neuroblasts develop into different types of neurons which express a different range of marker genes. The dorsal and ventral midline portions of the neural tube known as the roof and floor plates respectively do not contain neuroblasts.

The alar plate. The neural tube is from its very outset patterned in this axis as there is a roof plate floor plate and differing numbers and types of neuroblasts. They serve primarily as pathways for nerve fibers crossing from one side to the other. Roof plate alar plate.

In the embryo the ventral midline of the neural tube may be exposed to high levels of shh due to the close apposition of the notochord 12. In the spinal cord one of these axes dorsal ventral d v depends largely on signals produced by two specialized midline structures one at the ventral pole of the neural tube the floor plate yamada et al 1991 and the other at the dorsal pole the roof plate figure 58 2 b.