What is the muscle spindle reflex?
When muscles lengthen, the spindles are stretched. This stretch activates the muscle spindle which in turn sends an impulse to the spinal cord. This impulse results in the activation of more motor neurons at spinal level that send an impulse back to the muscle.
What is a muscle spindle and how does it work?
Muscle spindles are proprioceptors that consist of intrafusal muscle fibers enclosed in a sheath (spindle). They run parallel to the extrafusal muscle fibers and act as receptors that provide information on muscle length and the rate of change in muscle length. The spindles are stretched when the muscle lengthens.
What is a muscle spindle quizlet?
Describe the muscle spindle. – a peripheral receptor. – located in the muscle belly of skeletal muscles. – each spindle consists of intrafusal fibbers, sensory nerve endings, and gamma motor neurone endings. – responsible for conveying info to the CNS about absolute muscle length and changes in muscle length.
Why are muscle spindles important?
Ultimately, the muscle spindle functions to alert the brain that nearby joints and soft tissues are in danger of being stretched too far. These are important concepts in understanding body awareness (also known as proprioception and kinesthetic awareness).
How do muscle spindles help maintain posture?
How do Muscle Spindles Help Maintain Posture? It is a source of muscle tone as it provides a resistance to stretch and is involved in the stretch reflex. The stretch reflex allows for protection from painful or damaging stimuli. The static component of the spindles is involved in maintaining upright posture.
What is the purpose of the stretch reflex?
The stretch reflex is designed as a protective mechanism, to prevent strain and tear injuries to the muscles and tendons. When the muscle spindle is excited an impulse is immediately received to contract the muscle, thereby protecting it from being pulled forcefully or stretched beyond a normal range of motion.
What type of sensory information do muscle spindles transmit quizlet?
Muscle spindles detect muscle stretch and initiate a reflex that resists the stretch. proprioceptors located in tendons, close to the junction between the skeletal muscle and the tendon.
Which reflex occurs in response to excessive tension on a tendon?
The Golgi tendon reflex is a response to extensive tension on a tendon. It helps avoid strong muscle contractions which could tear the tendon from either the muscle or bone. In sports, quick movements can damage the tendon before the reflex can occur.
How do muscle spindles prevent injury?
Accordingly, when a muscle is stretched, this change in length is transmitted to the spindles and their intrafusal fibers which are subsequently similarly stretched. It may signal its muscle to contract to prevent it from going too far, too quickly in the stretch.
What is the importance of the muscle spindle with moving objects?
The muscle spindles influence motor firing directly and indirectly through spinal pathways to participate in important spinal reflexes, and through projections to the brain (Silverthorn, 2019).
What type of reflex does a knee jerk demonstrate?
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.
How do muscle spindles and Golgi tendon organs work together?
Two of these components—Golgi tendon organ (GTO) and muscle spindle—belong to the nervous system and function to influence movement. Two important proprioceptors that play a role in flexibility, the GTO and muscle spindle work together reflexively to regulate muscle stiffness.