292 



ANATOMY OF THE DOMESTIC FOWL 



viscera, including the enteric muscles. Fourth, cell groups of the 

 anterior horns, which are the center of all somatic volimtary 

 muscles. Fifth, groups of single cells probably belonging to the 



Fig. 77, A. 



G, A section through the tuberculum bigeminum. i, Pia mater. 2, Nerve 

 fibers. 3, Fine granular ground substance. 4, Thin layer of small cells. 5, 

 Fine granular ground substance. 6, A second thin cell layer. 7, Fine granular 

 ground substance. 8, Third thin cell layer. 9, Fine granular ground substance. 

 10, Fourth widely extended cell layer. 11, A fine granular layer. 12, A thick 

 layer of spindle cells. 13, A layer of medullated nerve fibers. 14, Ependemal 

 cells. IS. The sinus. 



H, A transverse section through the medulla oblongata. 1, 3, 4 and 6 are 

 ganglionic centers.. 2 , The dorsal groove. 8, The ventral fissure. 5 , The central 

 canal. 7, Fiber tracts. 



I, A transverse section through the cervical portion of the spinal cord, i. 

 Ventral septum, is, Dorsal septum. 3, The central canal. 4, The dorsal horn. 

 S, The ventral horn. 



J, A section through the wall of the oil gland, or rump gland, i, The stroma. 

 ^, The tubular glands some of which are branched. 



K, A section through a spike of a comb of a cock, i. The epithelial layer. 2, 

 A dense fibrous subepithelial layer. 3, A second fibrous vascular layer. 6, A 

 denser central core supporting the large arteries and veins. 4, A vein. s. An 

 artery. 



it A section through a lobe of the wattle of a hen. i, The epithelial layer. 

 2, A dense vascular layer. 3, A vein. 4, An artery. 5, A loose fibrous vascular 

 structure. 



posterior horns which are probably centers for other splanchnic 

 nerve fibers. 



The gray matter in the cord is in the form of two commas placed 

 with their backs together with the central canal passing between 



