Learn More
The relation between number of myelin lamellae and axon size in the CNS was examined by electron microscopy of spinal cord white matter fibres in different vertebrate species (cat, rabbit, guinea pig, rat, mouse, frog and perch). The results show that the number of myelin lamellae increases with increasing axon size in a non-linear fashion. Below an axon(More)
(1) Lamellated glial sheaths surrounding axons, and electrogenetically active axolemmal foci have evolved independently in widely different phyla. In addition to endowing the axons to conduct trains of impulses at a high speed, myelination and node formation results in a remarkable saving of space and energy. This is particularly important in the CNS, where(More)
(1) Although our knowledge on teeth and tooth nerves has increased substantially during the past 25 years, several important issues remain to be fully elucidated. As a result of the work now going on at many laboratories over the world, we can expect exciting new findings and major break-throughs in these and other areas in a near future. (2) Dentin-like(More)
The postnatal differentiation of rat optic nerve fibres was examined by transmission electron microscopy. The results show that many early developing axons contain clusters of vesiculotubular profiles prior to myelination. At places vesicular elements appear to fuse with the axolemma, and, in addition, some axons exhibit deep axolemmal invaginations and(More)
The retina-optic nerve junction (ROJ) was examined by electron microscopy in adult rats, with particular emphasis on the unmyelinated-myelinated nerve fibre transition. Both single sections and serial sections were used. The non-retinal part of the ROJ is covered by an extensively folded glia limitans, facing the choroidea, sclera and pia mater. The blood(More)
Through small longitudinal incisions in the ventral funiculus of the adult cat spinal cord the intramedullary portions of motoraxons forming the L7 ventral root were divided. The animals were sacrificed by glutaraldehyde-perfusion 1-15 weeks postoperatively. In some cases this was preceded by HRP injection into large L7 ventral horn neurons. Sections from(More)
The size spectra of unmyelinated, ensheathed and initially myelinating CNS axons were examined by electron microscopy in the spinal cord ventral funiculus and the corpus callosum of the cat during development. The first myelin sheaths appeared 4 weeks before and 3 weeks after birth in the spinal and callosal areas, respectively. De novo myelination had(More)
This study examines the fiber composition of two nerves projecting to the rat hindpaw: the lateral plantar nerve (LPN), which innervates plantar glabrous skin and some plantar muscles, and the foot branch of the superficial peroneal nerve (fSPN), which projects to dorsal hairy skin. The LPN contains 872 (33%) myelinated axons with a size range of 1-7(More)
The relation between the number of myelin lamellae (nl) and axon size (d) was examined in the developing and adult feline inferior alveolar nerve (IAN). The internodal lengths (L) and total diameters (D) were measured on teased IAN specimens from kittens and cats. The results show that relations nl/d and L/D principally similar to those in young adult cats(More)