What is meant by reflex


Source: Wikipedia. Pages: 103. Not shown. Chapter: Patellar tendon reflex, Achilles tendon reflex, extensor digitorum reflex, tibialis posterior reflex, biceps femoris reflex, scapulohumeral reflex, radius periosteal reflex, triceps tendon reflex, biceps tendon reflex, abdominal wall reflex, finger flexor reflex, masses reflex, toe reflex, adductor reflex. Excerpt: A self-reflex is a reflex that produces an effect in the same organ that was previously stimulated. Paradigmatically, in neurophysiology this usually refers to the muscle reflex, which is triggered by a muscle stretching via the Ia afferents via a switching point (monosynaptic) to the alpha motor neuron in the spinal cord and via the efferents (motor nerves) to a visible twitch of the previously stretched one Muscle leads. The extent of the reflex response depends on the state of excitation of the motor neuron and the functional integrity of the structures involved in the reflex arc. The state of excitation of a motor neuron is influenced, among other things, by descending motor path systems, depth sensitivity and segmental interneurons. After a stroke, the muscles' own reflexes can increase in the affected muscle groups (spasticity). Then z. B. the stretching of a muscle also in functionally adjacent muscle groups from reflex twitches, that is, external reflexes are also clinically recognizable. Damage to the reflex arc itself, for example due to neuritis or mechanical damage, on the other hand, typically leads to a weakening of the muscle reflex. Even the classic monosynaptic muscle reflex therefore does not follow a mechanically unchanged sequence but can be influenced, for example, through learning, attention and arbitrary tension. In contrast to external reflexes, self-reflexes are not habitable - there is no weakening or absence of the reflex response through repetition. Some muscle reflexes used in clinical neurological diagnostics. In the following list, the term affected nerve pathways refers to the nerves that absorb the stimulus and trigger the effect. As usual, the cranial nerves are represented in Roman numerals, the abbreviations C (neck), Th (chest) L (loin) and S (cross) refer to the

Product details

  • Publisher: Books LLC, Reference Series
  • Number of pages: 104
  • Release Date: May 23, 2011
  • German
  • Dimensions: 228mm x 154mm x 5mm
  • Weight: 166g
  • ISBN-13: 9781158951741
  • ISBN-10: 1158951744
  • Item no .: 31268613