Abstract
The follicles of the cat's carpal sinus hairs are supplied by free nerve endings and Merkel cell-neurite complexes. Simple lamellated corpuscles lie within the cavernous blood sinus. Slowly adapting sinus hair follicle units showed a directional sensitivity and responded to mechanical stimulation with a high-frequency velocity-dependent dynamic impulse discharge and an amplitude-dependent static response. A few sinus hair follicle mechanoreceptors were of fast adapting type. Pacinian corpuscles located close to the external sinus walls responded to vibratory stimuli. Hair disks immediately lateral to each sinus hair gave slowly adapting discharges. The functional significance of the unique combination of four mechanoreceptor types with different response properties within the carpal sinus hair organ is emphasized. Adrenergic nerve fibers are evaluated within cat sinus hair follicles. Electrical stimulation of the cervical sympathetic trunk produced small but repeatable changes in the dynamic responses of slowly adapting mechanoreceptors of cat vibrissae follicles.
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