Changes in axonal numbers in developing human trochlear nerve.
AUTOR(ES)
Mustafa, G Y
RESUMO
Complete axonal counts have been made in the intracranial parts of trochlear nerves from human fetuses of 9.2, 10 and 24 cm crown-rump length. A count was also made in the intraorbital part of the nerve from the 10 cm specimen. Schwann cell nuclei were also counted in typical cross sections, but do not necessarily reflect very accurately the schwann cell contents of the nerves. Axonal numbers conform to the propositions (1) that they do not all grow out at once, (2) do not all survive and (3) that degeneration may occur before or after myelination has begun. It seems inevitable that some loss of Schwann cells occurs in relation to the degeneration of myelinated axons, but there is no evidence for or against such a loss in relation to the degeneration of unmyelinated axons. Overall, however, Schwann cell numbers tend to increase as the number of myelinated axons increases.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1232939Documentos Relacionados
- Axonal and vascular changes following injury to the rat's optic nerve.
- Observations on the development of the connective tissues of developing human nerve.
- The ultrastructure of sheath cells in developing rat vomeronasal nerve.
- THE TROCHLEAR NERVE IN THE HUMAN EMBRYO AND FŒTUS
- Microglia in the human embryonic optic nerve.
