PRELIMINARY DESCRIPTION OF THE CELL 



29 



G 



FIG. 5. Nerve and muscle cells of animals. 



A, diagram of a typical neuron: a, axis cylinder process or axon, ending in arborescent 

 system; d, dendrites. (After Obersteiner and Hill.) B, cell from human spinal cord, 

 X 75. (After Obersteiner and Hill.) C, nerve cell from the eye. (After Lenhossek.) D. 

 Nerve cell from the earthworm. (After Kowalski.) E, young voluntary muscle cell. 

 F, portion of mature voluntary muscle cell, showing striations. G, Involuntary muscle 

 cell from intestine. (E-G after Piersol.) 



I 



FIG. 6. 



A, connective tissue from the jelly fish, showing branching cells and elastic fibers 

 imbedded in gelatinous matrix. (After Lang.) B, cells of hyaline cartilage imbedded 

 in their secretion. C, blood cell from chick embryo. 



