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Reflex action and types, Nervous system, Anatomy and Physiology
The document classifies and describes different types of reflexes. Reflexes are involuntary motor responses initiated by stimuli to peripheral receptors. Reflexes are classified clinically by the structures stimulated (superficial, deep, visceral, pathological), anatomically by the pathway involved (segmental, intersegmental, suprasegmental), and functionally (flexor, extensor, righting, postural, withdrawal). Reflex arcs can involve different numbers of synapses (monosynaptic, bisynaptic, polysynaptic). Reflexes can also be unconditioned or innate, or conditioned and acquired through learning.
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Reflex action and types, Nervous system, Anatomy and Physiology
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- 2. Definition Coordinated involuntary motor response initiatedby stimulus, applied to peripheral receptors. 18-Mar-21 2
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- 4. Classification of reflexes REFLEXES Clinical classification Superficial Deep Visceral Pathological Anatomic classification Segmental Intersegmental Suprasegmental No.of synapses Monosynaptic Bisynaptic Polysynaptic Functional classification Flexor Extensor Righting Postural Withdrawal Conditioned Unconditioned 18-Mar-21 4
- 5. Clinical classification • Superficial- stimulating superficial structures • Deep – stimulating receptors deep in muscle. • Visceral – stimulating receptors in viscera. • Pathological – present only during abnormality 18-Mar-21 5
- 6. Anatomic classification • Segmental– reflex arc pass through one anatomic segment . Ex : knee jerk • Intersegmental – involve greater than one segment Ex : crossed extensor response. • Suprasegmental – involve interaction with suprasegmental components. Ex: postural reflexes (head-limb) 18-Mar-21 6
- 7. Number of synapses •Asynaptic axon reflex • Monosynaptic stretch reflex • Bisynaptic reciprocal innervation • Polysynaptic superficial reflex 18-Mar-21 7
- 8. Functional classification • Flexorreflexes • Extensor reflexes • Righting reflexes • Postural reflexes • Withdrawal reflexes 18-Mar-21 8
- 9. Others • Unconditioned reflexes– inborn or inherent reflexes . • Conditioned reflexes – acquired reflexes. Secretion of saliva when food is kept in mouth is unconditioned reflex and, secretion even with thought is ‘conditioned’. 18-Mar-21 9
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