Sökning: "descending pathways"

Visar resultat 1 - 5 av 16 avhandlingar innehållade orden descending pathways.

  1. 1. Programming and updaing of reaching movements

    Författare :Sergei Perfiliev; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Reaching movements; motor cortex; central command; neuronal recording; trajectory updating; descending pathways; spinal cord lesions;

    Sammanfattning : Neuronal activity in the motor cortex (area 4) was recorded during reaching movements in cats, trained to perform target-reaching in response to a tone burst. Out of 350 task related neurones 12% generated short latency (20?110 ms) sensory responses to the cue triggering the reaching movement. LÄS MER

  3. 2. Neural mechanisms for the control of posture, locomotion and steering : a behavioral, electrophysiological and modeling study in lamprey

    Författare :Patriq Fagerstedt; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :reticulospinal; vestibular system; spinal cord; central pattern generator; reciprocal inhibition; fictive locomotion; fictive turning; electron microscopy; computer simulation; lamprey; dorsal fin;

    Sammanfattning : When animals move around interacting with the environment, the nervous system has to solve several tasks simultaneously in order to produce and control the movements - notably propulsion, posture, balance, and associated movements. Basic motor tasks are controlled by neuronal networks organized into central pattern generators (CPGs) and reflexes, located in the spinal cord and brainstem. LÄS MER

  4. 3. Gene expresion in rodent spinal neuronal populations and their response to injury

    Författare :Jesper Ryge; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Motor neurons are the centre of convergence for all neural activity relating to movements. The activity integrated in the motor neurons is transmitted to appropriate muscles generating coordinated muscle contractions. LÄS MER

  5. 4. Neurotransmission in CNS regions involved in pain modulation : neurochemical effects of analgesic drugs and spinal cord stimulation in the spinal cord and midbrain periaqueductal grey of the rat

    Författare :Carl-Olav Stiller; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Adenosine; dorsal horn; GABA; microdialysis; neurotensin; opioids; periaqueductal gray; sciatic nerve lesion; receptor binding; spinal cord stimulation; substance P.;

    Sammanfattning : The dorsal hom of the spinal cord and the midbrain penaqueductal grey matter (PAG) are important regions for pain modulation. In this thesis the effects of opioids and spinal cord stimulation (SCS) on the release of gamma-amino butyric acid (GABA), substance P (SP) and neurotensin (NT) were investigated in these regions of the rat by in vivo microdialysis. LÄS MER

  7. 5. Assessment of venous insufficiency in patients with chronic venous leg ulcers.Venous hemodynamics before and after surgery

    Författare :Marie Magnusson; Göteborgs universitet; []
    Nyckelord :Colour Doppler Ultrasound; leg ulcer; varicose vein surgery; recurrent leg ulcers;

    Sammanfattning : Venous insufficiency in the legs is a common disease, which may be complicated by chronic leg ulcers in 1% among the population. Venous ulcer duration is often long compared to other aetiologies and for the patient it involves long periods of pain, discomfort and reduced quality of life. LÄS MER