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Stretch reflex

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Radhika Chintamani
Radhika Chintamani

The stretch reflex is a monosynaptic reflex that causes a muscle to contract in response to stretching. It functions to protect muscles from overstretching and helps maintain good posture. The key components of the stretch reflex are: (1) muscle spindles that detect changes in muscle length, (2) the spinal cord which acts as the integrating center, and (3) afferent and efferent nerves which transmit signals between the muscles and central nervous system.

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Microteaching Stretch Reflex
Contents • Objective • Definition • Stretch reflex • Functions of stretch reflex • Home work
Objective of the class To understand what is stretch Reflex
Definition • It is a muscle contraction in response to stretching within the muscle. It is a monosynaptic reflex which provides automatic regulation of skeletal muscle length. Features: i. Monosynaptic: a simple reflex involving only one synapse between the sensory and motor neuron. ii. Ipsilateral: the stretch reflex is ipsilateral as it stimulates only the stipulated muscle to respond on the same side and not on the opposite side. iii. Automatic regulation: a sudden change induced in a muscle length or velocity gives signal to the spinal cord, which thus sends return signal to the muscle, thus leading to contraction.
Remember 3 things: 1. Muscle spindle: the muscle receptors, which respond to change in muscle length (located in muscle bulk) 2. Integrating center: can be either spinal cord or brain. In stretch reflex it is usually the spinal cord: away from tendon 3. Links : afferents- nerves taking signal towards brain or Spinal cord and efferents: nerves taking signal away from brain or spinal cord: towards tendon.
Functions of stretch reflex • Muscle protection: stretching of spindle increasing muscle length increase in motor neuron activity muscle to contract reduce stretching. • Maintain good posture: it is the consequence of stretch reflex.
Summary….. a. Define b. 3 things to remember c. 2 Functions
Stretch Reflex
Reference • Kisner C and Colby. Therapeutic exercise: foundations and techniques.6th ed. Philadelphia, Pennsylvania.
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Stretch reflex

  • 2. Contents • Objective • Definition • Stretch reflex • Functions of stretch reflex • Home work
  • 3. Objective of the class To understand what is stretch Reflex
  • 4. Definition • It is a muscle contraction in response to stretching within the muscle. It is a monosynaptic reflex which provides automatic regulation of skeletal muscle length. Features: i. Monosynaptic: a simple reflex involving only one synapse between the sensory and motor neuron. ii. Ipsilateral: the stretch reflex is ipsilateral as it stimulates only the stipulated muscle to respond on the same side and not on the opposite side. iii. Automatic regulation: a sudden change induced in a muscle length or velocity gives signal to the spinal cord, which thus sends return signal to the muscle, thus leading to contraction.
  • 5. Remember 3 things: 1. Muscle spindle: the muscle receptors, which respond to change in muscle length (located in muscle bulk) 2. Integrating center: can be either spinal cord or brain. In stretch reflex it is usually the spinal cord: away from tendon 3. Links : afferents- nerves taking signal towards brain or Spinal cord and efferents: nerves taking signal away from brain or spinal cord: towards tendon.
  • 6. Functions of stretch reflex • Muscle protection: stretching of spindle increasing muscle length increase in motor neuron activity muscle to contract reduce stretching. • Maintain good posture: it is the consequence of stretch reflex.
  • 7. Summary….. a. Define b. 3 things to remember c. 2 Functions
  • 9. Reference • Kisner C and Colby. Therapeutic exercise: foundations and techniques.6th ed. Philadelphia, Pennsylvania.