Anatomical studies on the cranial nerves of fully formed embryonic stage of Gambusia affinis affinis (Baird & Girard, 1853). II. Nervus glossopharyngeus

The organization of the roots, ganglia and the peripheral distribution of the glossopharyngeal nerve in the fully formed embryos of Gambusia affinis affinis are examined in serial transverse sections. The analysis of the fibres carried by this nerve is studied. The results of this study demonstrated that the nervus glossopharyngeus arises by one root and leaves the cranial cavity through the jugular foramen. It has an extracranially petrosal ganglion. This nerve has two rami; ramus pretrematicus and ramus posttrematicus. There is no ramus pharyngeus. The ramus pretrematicus carries general viscerosensory fibres. The ramus posttrematicus carries both general viscerosensory fibres and special ones and also carries visceromotor fibres.