NEET PG DENTAL EXAM

Detailed explanation-1: -The circuitry of the myotatic reflex. Increased firing of the annulospiral stretch receptor of the Ia muscle spindle afferents activates the muscle, here denoted as the extensor muscle. In the knee-jerk reflex this corresponds to the quadriceps muscle.

Detailed explanation-2: -Wiring of the inverse myotatic reflex. Sensors in the tendon, the Golgi tendon organ, are activated upon stretch of the tendon, which requires considerable force. These sensors synapse on interneurons in the spinal cord that inhibit further activity of the motor neurons innervating the muscle.

Detailed explanation-3: -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).