Which reflexes are stretch reflexes?

The stretch reflex is also referred to as the deep tendon reflex or myotatic reflex. It is a simple pre-programmed response by the human body in response to the muscle being passively stretched e.g. by a tendon hammer, or a sudden change in the ground surface.

What are muscle stretch reflexes?

Introduction. The stretch reflex or myotatic reflex refers to the contraction of a muscle in response to its passive stretching. When a muscle is stretched, the stretch reflex regulates the length of the muscle automatically by increasing its contractility as long as the stretch is within the physiological limits.

Where do stretch reflexes occur?

Anatomy of the Stretch Reflex

Located within the belly of the muscle, between and parallel to the main muscle fibers, are muscle spindles. These muscle spindles are made up of spiral threads called intrafusal fibers, and nerve endings, both encased within a connective tissue sheath.

Which is an example of stretch reflex stimulated by passive muscle movement?

Hence the correct answer is D) Patellar reflex.

Is knee-jerk reflex a stretch reflex?

The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord.

What is the stretch reflex quizlet?

The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. It is a monosynaptic reflex which provides automatic regulation of skeletal muscle length. When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases.

What initiates stretch reflex?

The receptor responsible for initiating a stretch reflex is the muscle spindle. Muscle spindles are found in almost all skeletal muscles and are particularly concentrated in muscles that exert fine motor control (e.g., the small muscles of the hand and eye).

What are the 5 deep tendon reflexes?

They are sometimes referred to as muscle stretch reflexes. There are five primary deep tendon reflexes: bicep, brachioradialis, triceps, patellar, and ankle. Each reflex corresponds to a particular root and muscle and will evaluate the integrity of the root and associated nerve.

What causes muscle stretch?

The stretching of a muscle fiber begins with the sarcomere, the basic unit of contraction in the muscle fiber. As the sarcomere contracts, the area of overlap between the thick and thin myofilaments increases (discussed above). As it stretches, this area of overlap DECREASES, allowing the muscle fiber to elongate.

What is the difference between a stretch reflex and a tendon reflex?

The stretch reflex operates as a feedback mechanism to control muscle length by causing muscle contraction. In contrast, the tendon reflex operates as a negative feedback mechanism to control muscle tension.

What are the 5 deep tendon reflexes?

They are sometimes referred to as muscle stretch reflexes. There are five primary deep tendon reflexes: bicep, brachioradialis, triceps, patellar, and ankle. Each reflex corresponds to a particular root and muscle and will evaluate the integrity of the root and associated nerve.

What structure initiates stretch reflexes?

The classic stretch reflex involves the stretch receptor in the skeletal muscle spindle and its afferent Ia fiber in the posterior nerve root, which directly or indirectly excites the alpha motor neuron in the spinal cord.

How long does stretch reflex last?

A study by Wilson (1990) concluded that while bench pressing, the stretch would last up to four seconds. At that point all started elastic energy is lost. Other studies by Chapman and Caldwell (1985) found it to be the same as Pete—0.25 seconds and the plyometric action is lost.

What are the 4 types of reflexes?

In our discussion we will examine four major reflexes that are integrated within the spinal cord: the stretch reflex, the Golgi tendon reflex, the withdrawal reflex and the crossed extensor reflex.

What are the 6 deep tendon reflexes?

After obtaining the reflex on one side, always go immediately to the opposite side for the same reflex so that you can compare them.
  • Jaw Jerk. Place the tip of your index finger on a relaxed jaw, one that is about one-third open. …
  • Biceps Reflex. …
  • Triceps Reflex. …
  • Brachioradialis Reflex. …
  • Finger Jerk. …
  • Knee Jerk. …
  • Ankle Jerk.