Morphophysiological and ultrastructural studies in the mammalian cristae ampullares.

摘要: There are three kinds of afferent terminations in the cristae ampullares. Calyx units innervate a few neighboring type I hair cells. Bouton contact several II Dimorphic both receptors. Axon diameters largest for calyx fibers and smallest bouton fibers. supply all parts sensory epithelium. confined to central zone crista its peripheral zone. Intra-axonal labeling was used determine innervation patterns physiologically characterized afferents. irregularly discharging. have more irregular discharge than those units, which also been identified by their slow conduction velocities, regularly An afferent's regularity, sensitivity externally applied galvanic currents response dynamics closely related epithelial location branching pattern or types number cells it contacts. Of various properties studied, only rotational gains seemed terminal morphology. Afferents innervating zones differ properties. A preliminary ultrastructural study indicates that there regional variations synaptic organization. Type contacted many boutons Individual multiple ribbon synapses with cells, whereas each usually has single contact. Synapses between endings common centrally, but not peripherally. Two features did vary regionally: 1) make 10-20 endings; 2) cell is 2-6 efferent endings. The ending declines slightly from Reciprocal were rare.