Myotactic reflex

Myotactic Reflex

The Myotactic Reflex, also known as the Stretch 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.

Mechanism

When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases. This increase in activity is transmitted to the alpha motor neuron in the spinal cord, causing the muscle fibers to contract and thus resist the stretching. A secondary set of neurons also causes the opposing muscle group to relax.

Function

The myotactic reflex assists in the maintenance of posture and support while the body and limbs are moving. It also plays a crucial role in the motor control system, helping to ensure that muscles contract and relax in a coordinated manner.

Clinical Significance

The myotactic reflex is used in neurological examinations to assess the condition of the nerves and the spinal cord. An absent or diminished reflex can indicate damage to the peripheral nerves or the spinal cord, while an exaggerated reflex can indicate damage to the brain or the nerve pathways connecting it to the spinal cord.

See Also

• Muscle Spindle
• Alpha Motor Neuron
• Neurological Examination