Distribution and innervation of lateral line organs in the axolotl.

摘要: The lateral line system in axolotls consists of three types receptors and the cranial nerves that innervate them. Superficial neuromasts, which are mechanoreceptors, distributed lines on both head trunk. Eight cephalic trunk can be distinguished basis their innervation differences orientation major axes neuromasts. A combination histological techniques reveals five separate pairs neuromasts: anterodorsal supraorbital infraorbital lines; anteroventral angular, oral, jugal, preoperculomandibular cheek lower jaw; middle supratemporal postotic posterior lines. In addition to a second class mechanoreceptive organs, pit also occur head. Pit organs smaller than neuromasts but innervated manner identical sensory hair cells single organ by two afferent fibers efferent fiber. Although they localized clusters rather lines, four distinct occurring referred as anterior, middle, cheek, gular appear homologous similarly named fishes topography innervation. ampullary comprise third restricted These electroreceptors singly or small adjacent neuromast along base external gills. nerves, whereas all other nerves. Thus different Examination ganglia with respect indicates varying levels fusion. profundal-trigeminal totally throughout rostrocaudal extent. facial form fused ganglionic complex larger pigmented nerve occupying dorsal portion complex.(ABSTRACT TRUNCATED AT 400 WORDS)