COMPARATIVE AND TOPOGRAPHICAL ANATOMY OF THE FOWL : LXX. TOPOGRAPHICAL ANATOMY AND CYTOARCHITECTURE OF THE SUPERIOR CERVICAL GANGLION

Abstract

The topographical anatomy and the cytoarcl?itecture of tlte superior cervical ganglionwere described and illustrated in detail on tlte basis of sttudies on 26 fowls. The resultsobtained are summarized in the following table and plates.l. The superior cervical ganglion was surrounded by the glossopharyngeal andvagus nerves ancl the internal carotid artery. It was related to these nerves through 17nerve brarnches. The glossopharyngeal nerve then passed through cranial one-fifth toone-sixth of the ganglion (Figs. l, 3, and 4).2. The ganglion consisted morphologically of not only one kind of ganglion cells.but two other kinds of ganglion cells. Tl?ese cells were classified into large, intermediate, and small cells on tlae basis of size and Nissl bodies (Figs. 2 ar?d 5 to 10).3. All the ganglion cells were counted in every second section. The numbers ofcells in three fowl breeds are shown in Table I. When tlrey were tripled to include thenumbers of cells in the interveninc sections the total numbers of c"ancloin cells in theb7.5bthree breeds were 7, 965, 9, 132, and 10, 923, respectively.