A study of the median giant fiber system in the cephalic ganglion of a crayfish (Procambarus clarkii)

✍ Scribed by Etsuko Horiuchi; Hideo Hayashi; Isao Takahashi

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 570 KB
• Volume: 141
• Category: Article
• ISSN: 0021-9967
• DOI: 10.1002/cne.901410105

✦ Synopsis

The pathway of the median giant fiber in the crayfish cephalic ganglion(brain) was reconstructed from serial sections. The median giant fiber in the para-esophageal nerve runs anteriorly and enters the brain. After turning medially, i t gives off a branch which further divides into two branches. These brsnches run ventrally and outwards and finally enter the ipsilateral antennule nerve and the ipsilateral antennary nerve, respectively. The main fiber runs medially and ventrally. It decussates and makes contact with the contralateral median giant fiber near the midline. After decussating, the fiber again divides into two branches. One runs outwards and ventrally and finally enters the contralateral antennule nerve. The other runs anteriorly at first and then turns ventrally immediately behind the rostra1 cellular group. Near the ventral surface of the brain the fiber turns posteriorly and connects with a large soma 100-150 p in diameter. In its course to the soma, the main fiber decreases in width to oneeighth of the diameter of the axon in the para-esophageal nerve.