Morfologii͡a (Saint Petersburg, Russia)
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A complex study of morphometric characteristics of the articular surfaces of the temporomandibular joint and the examination of the peculiarities of the petrotympanic fissure topography were performed on 138 samples of skulls of adult individuals with intact occlusion, complete anodontia and different forms of cranial skull (dolicho-, meso- and brachicranial). No distinct differences in studied parameters were found between the studied groups. However, in the hypsicranial group the petrotympanic fissure was found to pass more often through the medial third of the mandibular fossa, which may be a predisposing anatomical factor for Costen syndrome. Due to the fact that in anodontia the parameters characterizing the articular surfaces of the temporomandibular joint, are significantly changed, the immediate cause of the Costen syndrome are the changes of the articular surfaces of the temporomandibular joint, primarily the reduction in the size of mandibular condyle, which is accompanied by its pathological displacement and compression of the chorda tympani.
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The study of the epidural space was performed on 362 samples of the vertebral column obtained from the fetuses aged from 16 weeks, newborns, children and adult persons aged up to 90 years, using anatomical and histological methods. Within the lateral parts of the epidural space, the lateral vaults were distinguished. A new anatomical interpretation of these structures is proposed, considering them as a complex of anatomical structures including the periosteum of the intervertebral foramen, the sleeve of dura mater, intervertebral veins, spinal arteries, adipose tissue, the system of the connective-tissue trabeculae, recurrent nerves controlling the blood flow in the vascular system of the vertebral channel and promoting the communication of the epidural space with the paravertebral areas.
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Morphological features of the neurons containing neurofilaments with molecular mass of 200 kD (NF200+), were studied in the sensory ganglia of thoracic and lumbar spinal nerves in rats (n = 80) during the first year of their life. Capsaicin treatment (150 mg/kg) of the newborn animals resulted in the change of age dynamics of NF200+ neurons. This was reflected by a reduction of NF200+ neuron numbers and their cross-sectional areas in both ganglia. Segmental differences included greater reduction of NF200+ neuron number in the sensory ganglion of lumbar spinal nerve in both early and late developmental periods.