They stimulate inspiration and promote rapid shallow respiration. Supplied by unmyelinated fibers, rapidly adapting. Stimulated by interstitial edema and inflammation and some chemicals. Cause laryngeal closure and apnea, followed by rapid shallow breathing. Ruffini receptors, and pacinian and Golgi organs are present in the joints of the chest wall.
Activity is proportional to the rate of change of rib movement.
Present in the intercostal and diaphragmatic muscle tendons 2. Monitor the force of contraction and inhibit inspiration. Abundant in the intercostals and rare in diaphragm 2. Help stabilize rib cage and compensate for changes in body position and speech. Spindles located on intrafusal muscle fibers aligned with extrafusal fibers that elevate the ribs.