نتایج جستجو برای: nerve fibres
تعداد نتایج: 176824 فیلتر نتایج به سال:
OBJECTIVES Vocal cord palsy seen in some patients with multiple system atrophy may result from neuronopathy of the recurrent laryngeal nerve. METHODS Six controls and six patients with multiple system atrophy, four with and two without vocal cord palsy were studied. The number of myelinated nerve fibres were counted and fibre diameter histograms were established for the motor and sensory divi...
Pathology and physiology of auditory neuropathy with a novel mutation in the MPZ gene (Tyr145->Ser).
We studied a family with hereditary sensory motor neuropathy and deafness accompanying a missense mutation in the MPZ gene. Pathological examination of the cochlea in one of the family members revealed marked loss of auditory ganglion cells and central and peripheral auditory nerve fibres within the cochlea. The inner hair cells were of normal number with preserved morphology. The outer hair ce...
NERVE fibre bundles of different size aberrant ,from the optic nerve escape according to Ida Mann (1937) from the confines of the optic stalk, and become free in the orbit. They originate at an early stage (about 17 mm. length) when the nerve fibres find their way from the ganglion cells into the optic stalk. Anatomically they are a division of the main stem of the optic nerve in its orbital or...
Sympathetic ganglia from newborn rats and guinea-pigs were grown in modified Rose chambers and examined with scanning electron microscopy after 5-7 days. The cell types seen were macrophages, neurons, glial cells and connective tissue cells. They presented a wide range of surface morphologies and 3-dimensional configurations, from spheroid with an irregular surface to flattened with a smooth su...
A small pneumatic cuff inflated around the knee was used to produce tourniquet paralysis in baboons. A cuff pressure of 1,000 mm Hg maintained for one to three hours produced paralysis of distal muscles lasting up to three months. Nerve conduction studies showed that most of the motor fibres to the abductor hallucis muscle were blocked at the level of the cuff and that they conducted impulses n...
By measuring the distribution of conduction velocities (DCV) in sensory fibres of the median nerve, the effects of asymptomatic increased lead, zinc, and copper absorption on the conduction velocities of slower and faster nerve fibres were examined in 29 gun metal founders with blood lead (BPb) concentrations of 22-59 (mean 39) micrograms/dl (1.1-2.8 (mean 1.9) mumol/l). The results indicated t...
The trigeminal nerve in the rainbow trout, Oncorhynchus mykiss, was examined for the presence of A-delta and C fibres. Sections of the three branches of the trigeminal nerve were found to comprise a range of fibre types including A-delta and C fibres. The size range of the cell bodies of the trigeminal ganglion reflected the fibre range since they correlated with the size range of axons in the ...
Several experimental models have demonstrated that the central nervous system is functionally linked to the immune system by means of the autonomic nervous system. Samples of 36 lymph nodes of patients whose ages ranged from 16 to 69 y were studied. In order to demonstrate the existence and distribution of sympathetic nerve fibres, a polyclonal antibody antityrosine hydroxylase (TH), with the s...
Objective: In rat sympathetic ganglia decentralization by preganglionic denervation leads to new synapse formation. We explored the extent to which these synapses might be derived from peptidergic nerve fibres. Material and Method: The distribution of immunoreactivities for calcitonin gene-related peptide and substance P was determined in superior cervical ganglia of normal rats and of rats fol...
The small and large intestine of adult horses were histochemically and immunohistochemically investigated in order to evidence components of the intramural nervous system. The general structural organization of the intramural nervous system was examined by using Nissl-thionin staining as well as the anti-neurofilament 200 (NF200) immunoreaction, which demonstrated the presence of neurons in the...
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