Roof Plate Spinal Cord

Perturbation of neuronal differentiation and axon guidance in the spinal cord of mouse embryos lacking a floor plate.

Roof plate spinal cord.

Spinal cord roof plate cells act as a signaling center producing gdf7 and other bmp related molecules and wnt molecules to non autonomously control specification of numerous classes of adjacent dorsal interneurons lee and jessell 1999. Analysis of danforth s short tail mutation. The basal plate forms most of the ventral portion of the nervous system including the motor portion of the spinal cord and brain stem. A role for bmp heterodimers in roof plate mediated repulsion of commissural axons.

Failli et al 2002 we examined expression of lmx1a protein in both chick and mouse developing spinal cord using rabbit polyclonal antibodies raised against a unique peptide in the amino terminal end of. Chizhikov and millen 2004b. Note the relative size of the spinal cord seen at the lower end of each image. The roof plate of both the pons and the medulla is formed by the cerebellum and a membrane containing a cellular layer called the choroid plexus located in the fourth ventricle.

The alar plate or alar lamina is a neural structure in the embryonic nervous system part of the dorsal side of neural tube that involves the communication of general somatic and general visceral sensory impulses the caudal part later becomes sensory axon part of the spinal cord. Located on the ventral midline of the embryonic neural tube the floor plate is a specialized glial structure that spans the anteroposterior axis from the midbrain to the tail regions it has been shown that the floor plate is conserved among vertebrates such as zebrafish and mice with homologous. Chizhikov and millen 2005. The floor and roof plate are specialised developmental regions important embryonic patterning regions.

The floor plate is a structure integral to the developing nervous system of vertebrate organisms. These results provide evidence for the persistence of embryonic floor and roof plate cells in the adult spinal cord niche. Helms and johnson 2003. The medulla oblongata myelencephalon the most caudal segment of the brainstem appears as a conical expansion of the spinal cord.

The alar plate specifically later on becomes the dorsal gray of the spinal cord and develops into the sensory. Human nervous system human nervous system medulla oblongata. The alar plate forms the. The neural tube forms similar regions around the wall along its length including the spinal cord.

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 dorsal epidermis. After closure the neural tube forms a basal or floor plate and a roof or alar plate in response to the combined effects of shh and factors including bmp4 secreted by the roof plate. Roof plate progenitors as well as mature roof plate cells express the lim homeodomain transcription factors lmx1a b which is necessary and sufficient for. Results lmx1a specifically marks roof plate progenitors and differentiated roof plate cells in both chick and mouse developing spinal cord.

Butler sj dodd j.