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Saturday, November 14, 2020 | History

2 edition of On motoneuron synaptology in adult cats. found in the catalog.

On motoneuron synaptology in adult cats.

Sebastian Conradi

On motoneuron synaptology in adult cats.

  • 34 Want to read
  • 2 Currently reading

Published in Stockholm .
Written in English

    Subjects:
  • Myoneural junction.,
  • Cats -- Anatomy.,
  • Motor neurons.

  • Edition Notes

    Bibliography: p. 106-111.

    StatementAn electron microscopic study of the structure and location of neuronal and glial elements on cat lumbosacral motoneurons in the normal state and after dorsal root section.
    SeriesActa physiologica Scandinavica., Supplementum, 332
    Classifications
    LC ClassificationsQP363 .C62
    The Physical Object
    Pagination115 p.
    Number of Pages115
    ID Numbers
    Open LibraryOL5741724M
    LC Control Number70851690

    In adult cats the medial gastrocnemius (MG) nerve was transected and ligated. After 6 weeks the nerve was allowed to reinnervate its muscle through a nerve graft. With approximately 6 weeks needed for muscle reinnervation [Foehring, et al. () J. Neurophysiol. ], the MG motoneurons were devoid of neuromuscular contact for. A motor neuron (or motoneuron) is a neuron whose cell body is located in the motor cortex, brainstem or the spinal cord, and whose axon (fiber) projects to the spinal cord or outside of the spinal cord to directly or indirectly control effector organs, mainly muscles and glands. There are two types of motor neuron – upper motor neurons and lower motor neurons.   The findings that motoneuron was able to resubject muscle by regeneration and finally full or nearly full recovery in adult animals with sciatic nerve injury [12], but with reduced excitatory postsynaptic potentials, indicated the plasticity of motoneuron central synapses after transiently losing a link between motoneuron and its controlled. The aim of the present study was to investigate whether ultrastructural features can be used as a guide to identify alpha- and gamma-motoneurons among the intermediate-size neurons of the peroneal motor nuclei. The peroneus brevis and peroneus tertius muscles of adult cats were injected with horsera .

    This chapter considers a study on fine structure of the olive of the cat with particular focuses on certain findings. Perfusion with formalin has been.


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On motoneuron synaptology in adult cats. by Sebastian Conradi Download PDF EPUB FB2

On motoneuron synaptology in adult cats: an electron microscopic study of the structure and location of neuronal and glial elements on cat lumbosacral motoneurons in.

OCLC Number: Description: pages illustrations 24 cm. Series Title: Acta physiologica Scandinavica., Supplementum, Responsibility: An electron microscopic study of the structure and location of neuronal and glial elements on cat lumbosacral motoneurons in the normal state and after dorsal root section.

Get this from a library. On motoneuron synaptology in kittens. An electron microscopic study of the structure and location of neuronal and glial elements on cat lumbosacral motoneurons in the normal state and after dorsal root section. [Sebastian Conradi; Sten Skoglund; Karolinska mediko-kirurgiska institutet.

Institutionen för anatomi och histologi.]. Abstract. Dendrites constitute over 80% of the receptive surface area in cat motoneurons. Calculations based on matched electrical and geometrical measurements in these neurons indicate that the specific resistance of dendritic membranes in resting motoneurons is at least 2, ohm-cm the specific membrane resistance is this high, even the most distal dendritic synapses can contribute Cited by: Inherited Motor Neuron Disease in Domestic Cats: A Model of Spinal Muscular Atrophy Article in Pediatric Research 57(3) April with Reads How we measure 'reads'.

In a study on ct- and 7-motoneurons in the thora- cic region of the spinal cord of the cat [6] a similar difference was noted between thc two types of motoneuron but, in addition, two subgroups within the 7-population were detected with synaptic covers of > 20% and. Ultrastructure and synaptology of the initial axon segment of cat spinal motoneurons during early postnatal development.

Ultrastructure and distribution of neuronal and glial elements on the motoneuron surface in the lumbosacral spinal cord of the adult cat. In the detailed electron microscopic examination5, 20 motoneurons in the L7 region of the spinal cords of adult cats were examined in transverse sections.

The re- gions of the neuron are named SO (cell body), DA (defined as that part of the den- drite such that, counting from the cell body, 20 boutons were encountered on one side of the section), and DB (more distal than DA).

Summary. Nucleus dorsalis of the adult cat atL3 has been examined electron microscopically, and six types of terminal bouton 1 and 2 consist of elongated giant boutons (5–25 μm) containing numerous mitochondria and neurofilaments, and circular and elliptical vesicles respectively, which establish repeated synaptic contacts along the surface of the Clarke cell soma and.

C postsynaptic organelles were observed in motoneuron somata (3%) and primary dendrites (1%) with an overlying neuroglial cell process and no presynaptic bouton. The synaptology of the rat ventral horn is comparable to that in the cat and monkey.

However, M (R) and P bulbs were not observed in the rat. A comparison of peripheral and rubrospinal synaptic input to slow and fast twitch motor units of triceps surae, J. Physiol. (Lond.), () 5 CONRADI, S., On motoneuron synaptology in cats.

Developmental Brain Research, 37 () Elsevier BRD An ultrastructural On motoneuron synaptology in adult cats. book of the synaptology of 7-motoneurones during the postnatal development in the cat Ulf Arvidsson, Johan Svedlund, Per-/~ke Lagerb/ick and Staffan CuUheim Department of Anatomy, Karolinska Institutet, Stockholm (Sweden) (Accepted 23 June ) Key words: Postnatal development; Motoneuron.

Author(s): Conradi,Sebastian Title(s): On motoneuron synaptology in adult cats; an electron microscopic study of the structure and location of neuronal and glial elements on cat lumbosacral motoneurons in the normal state and after dorsal root section. Conradi S () On motoneuron synaptology in adult cats.

Acta Physiol Scand Suppl 5–48 Google Scholar Conradi S, Ronnevi LO () Ultrastructure and synaptology of the initial axon segment of cat spinal motoneurons during early postnatal development. An ultrastructural study of the synaptology of gamma-motoneurones during the postnatal development in the cat.

Brain Res. ; – Arvidsson U, Riedl M, Elde R, et al. Vesicular acetylcholine transporter (VAChT) protein: a novel and unique marker for cholinergic neurons in the central and peripheral nervous systems. We investigated the synaptology of retrogradely labeled spinal motoneurons after injection of horseradish peroxidase into the tibialis anterior (TA) muscle of adult rat.

In total, 32 TA motoneurons were investigated in the electron microscope and demonstrated a bimodal size distribution with cell diameter peaks at 40 μm and 20 μm, likely. The electrophysiological properties of spinal cord alpha-motoneurons were investigated in adult cats ( yr old) and old cats ( yr old) using intracellular recording techniques.

Voltage transients following depolarizing pulses of current were analyzed according to the. We investigated the synaptology of retrogradely labeled spinal motoneurons after injection of horseradish peroxidase into the tibialis anterior (TA) muscle of adult rat. In total, 32 TA motoneurons were investigated in the electron microscope and demonstrated a bimodal size distribution with cell diameter peaks at 40 mu m and 20 mu m, likely representing alpha- and gamma-motoneurons.

In adult cats, avulsion of a spinal ventral root induces retrograde cell death among the corresponding motoneurons and, also, enhanced monosynaptic reflexes ipsilaterally in the adjacent uninjured spinal cord segments.

The present study investigates possible. NPCs were isolated from the subventricular zone of neonatal cats and implanted at the site of transection in the medial longitudinal fascicle of adult cats. Abducens internuclear neurons of host animals showed a complete restoration of axotomy-induced alterations in eye position sensitivity, but eye velocity sensitivity was only partially regained.

The aging of spinal cord alpha motoneurons was explored in old cats with intracellular recording techniques to determine the basic membrane properties of these neurons and their monosynaptic. We recently proposed a new surgical approach to treat ventral root avulsion, resulting in motoneuron protection.

The present work combined such a surgical approach with bone marrow mononuclear cells (MC) therapy. Therefore, MC were added to the site of reimplantation.

Female Lewis rats (seven weeks old) were subjected to unilateral ventral root avulsion (VRA) at L4, L5 and L6 levels and.

Role of persistent sodium and calcium currents in motoneuron firing and spasticity in chronic spinal rats. J Neurophysiol –, Link ISI Google Scholar; Mackel R. Segmental and descending control of the external urethral and anal sphincters in the cat.

J Physiol –, Crossref PubMed ISI Google Scholar. J O Kellerth's 61 research works with 5, citations and reads, including: Plexus avulsion and spinal cord injury increase the serum concentration of S protein: An experimental study in rats.

Transplants of neural progenitor cells (NPCs) into the injured CNS have been proposed as a powerful tool for brain repair, but, to date, few studies on the physiological response of host neurons have been reported.

Therefore, we explored the effects of NPC implants on the discharge characteristics and synaptology of axotomized abducens internuclear neurons, which mediate gaze conjugacy for. Neuronal nitric oxide synthase immunoreactivity (NOS1-ir) in sacral motor neurons of normal adult cats was compared with that in cats surviving 1–10 wk after unilateral transection and ligation of the pudendal nerve.

Levels of immunostaining were measured by microdensitometry. Spinal muscular atrophy (motor neuron disease) causes degeneration and/or death of the motor neurons (motoneurons) in the spinal cord. A motor neuron is a nerve cell, which is located in the spinal cord. The axon of the motor neuron extends from the spinal cord and “transmits” impulses to the muscles.

Conradi S. Ultrastructure and distribution of neuronal and glial elements on the motoneuron surface in the lumbosacral spinal cord of the adult cat. Acta Physiol Scand Suppl. ; – Conradi S, Kellerth JO, Berthold CH, Hammarberg C. Electron microscopic studies of serially sectioned cat spinal alpha-motoneurons.

We tested whether the muscle innervated may influence the expression of motoneuron electrical properties. Properties of individual motor units were examined following cross-reinnervation (X-reinnervation) of cat lateral gastrocnemius (LG) and soleus.

On motoneuron synaptology in adult cats. Conradi. Acta physiol. scand., (Suppl. Scand., MED: The distribution of group Ia synapses on lumbosacral spinal motoneurones in the cat. Jack. Neuroglial response to sciatic neurectomy. Normal distribution of VGLUT1 synapses on spinal motoneuron dendrites and their.

Request PDF | Simulation of motoneuron morphology in three dimensions. Building complete neurons | By using dendrogram data from six adult cat alpha motoneurons, we have constructed computer. Changes in synaptology of adult cat spinal alpha-motoneurons after axotomy.

Chapter 8: current techniques and concepts in peripheral nerve repair. Contributing factors to poor functional recovery after delayed nerve repair: prolonged axotomy.

An intriguing feature of the nervous system is its plasticity—the remarkable lifelong capacity to change and adapt in light of intrinsic and extrinsic stimuli. Among the many different adaptive mechanisms that occur within the nervous system, changes in neurotransmission form an important plasticity-bestowing mechanism in the reconfiguration of neuronal circuits.

In comparison, SK3 channels are found on all cat motor neurons, whereas the exact distribution of SK2 channels is not clear (Deardorff et al. These data support, at least in rodents, some degree of motor neuron‐subtype specificity in C bouton signalling. Model morphology, biophysical properties, and verification.

We developed a computer-based cable model of an adult cat α-motoneuron using NEURON simulation environment (Hines and Carnevale ).The model had full representation of the α-motoneuron structure and consisted of soma, axon hillock (AH), initial segment (IS), and dendritic tree.

Using horseradish peroxidase as a retrograde marker, the ultrastructural response of alpha and gamma motoneuronal cell bodies in the cat thoracic spinal cord has been compared 1–8 days following intercostal nerve transection and ligation. By light microscopy, reduction of Nissl body size, together with nuclear and nucleolar alterations were seen in alpha motoneurons 4–8 days following.

Properties of individual motor units were examined following cross-reinnervation (X-reinnervation) of lateral gastrocnemius (LG) and soleus muscles by the medial gastrocnemius (MG) nerve in the cat.

We examined animals at two postoperative times: wk (medX) and mo (longX). Get this from a library. The Bobath Concept in Adult Neurology. [Bente Gjelsvik] -- Treatment of the Neurologically Impaired Adult_xD__xD_With the present book, acclaimed international Bobath instructor and therapist Bente Gjelsvik offers an.

Motoneuron properties during motor inhibition produced by microinjection of carbachol into the pontine reticular formation of the decerebrate cat. J Neurophysiol –, c.

doi: /jn   Spinal cord injuries lead to impairments, which are accompanied by extensive reorganization of neuronal circuits caudal to the injury. Locomotor training can aid in the functional recovery after injury, but the neuronal mechanisms associated with such plasticity are only sparsely known.

We investigated ultrastructurally the synaptic inputs to tibialis anterior motoneurons (MNs). 1. Excitatory postsynaptic potentials (EPSPs) generated in soleus motoneurons by single homonymous Ia-fibers were measured using intracellular recording and the spike-triggered averaging technique.

Two groups of barbiturate-anesthetized adult cats were studied: one with the spinal cord intact and the other with the spinal cord severed at thoracic segment 13 (T13) several hours prior to recording.1.

This study makes use of the pattern of synaptic connections between motoneurons and Ia afferents of triceps surae muscles in the cat to test the relative importance of synaptic identity, neuronal size, and neuronal topography as determinants of Ia-afferent connectivity and excitatory postsynaptic potential (EPSP) amplitude.

2. The synaptic actions of single-Ia medial gastrocnemius (MG.We used computer simulations to study the dendritic spatial distribution of low voltage-activated L-type calcium (Ca(V) type) channels, which mediate hysteretic persistent inward current (PIC) in spinal motoneurons.

This study was prompted by the growing experimental evidence of the functional interactions between synaptic inputs and active conductances over the motoneuron dendritic tree.