Transitional Nerve: A New and Original Classification of a Peripheral Nerve Supported by the Nature of the Accessory Nerve (CN XI)
Figure 3
A cross-section through the developing head region shows mesoderm forming somitomeres instead of somites. Somitomeres contribute to the formation of striated muscle in the head, while neural crest cells form the mesenchymal component. A cross-section through the developing embryo head region is seen on the right. In the head, mesoderm does not develop into somites, but remains loosely organized which some authors refer to as “SOMITOMERES”. The mesoderm will still form striated musculature in the head, however; neural crest cells contribute to the connective tissue and the osseous attachment sites.
