Search results
Results from the WOW.Com Content Network
The dermatome is the dorsal portion of the paraxial mesoderm somite which gives rise to the skin . In the human embryo, it arises in the third week of embryogenesis . [ 2 ] It is formed when a dermomyotome (the remaining part of the somite left when the sclerotome migrates), splits to form the dermatome and the myotome. [ 2 ]
[4] [5] However, the segmentation clock model is highly evolutionarily conserved. [ 6 ] Intrinsic expression of "clock genes" must oscillate with a periodicity equal to the time necessary for one somite to form, for example 30 minutes in zebrafish, 90 minutes in chicks, and 100 minutes in snakes.
These structures are specified from dorsal to ventral and from medial to lateral. [8] Each somite will form its own sclerotome that will differentiate into the tendon cartilage and bone component. Its myotome will form the muscle component and the dermatome that will form the dermis of the back. The myotome and dermatome have a nerve component ...
Here, retinoic acid interacts with these pathways. [6] Early markers of somites exist but are not expressed in cephalic mesoderm, although the same cell types that are generated in somites are generated in cephalic mesoderm, such as angioblasts , myocytes , and a variety of connective tissues.
Similarly a dermatome is an area of skin that a single nerve innervates with sensory fibers. Myotomes are separated by myosepta (singular: myoseptum ). [ 2 ] In vertebrate embryonic development , a myotome is the part of a somite that develops into muscle.
A dermatome is an area of skin that is mainly supplied by afferent nerve fibres from the dorsal root of any given spinal nerve. [ 1 ] [ 2 ] There are 8 cervical nerves (C1 being an exception with no dermatome), 12 thoracic nerves , 5 lumbar nerves and 5 sacral nerves .
The lateral plate mesoderm is the mesoderm that is found at the periphery of the embryo.It is to the side of the paraxial mesoderm, and further to the axial mesoderm.The lateral plate mesoderm is separated from the paraxial mesoderm by a narrow region of intermediate mesoderm.
The peripheral nervous system (PNS) is divided into the somatic nervous system, the autonomic nervous system, and the enteric nervous system.However, it is the somatic nervous system, responsible for body movement and the reception of external stimuli, which allows one to understand how cutaneous innervation is made possible by the action of specific sensory fibers located on the skin, as well ...