40 GENERAL BIOLOGY 



(II) Smooth or unstriated muscles. These are muscles 

 which are automatic in action, or at least not 

 under conscious control. The muscles of the 

 intestines, the bladder, etc., are examples. A 

 piece of muscle from the stomach when teased 

 should show the fibers. Observe the shape, 

 arrangement, and nuclei of the fibers. Draw 7 . 

 (e) Nerve Tissue. 



(I) Fibers. Tease the sciatic, or other large nerve, 

 in salt solution. In a single fiber look for a 

 place where it is torn or crushed and identify 

 the delicate sheath on the outside. Inside this 

 is the thicker medullary sheath. Making up 

 the center is the axis cylinder, axone, or nerve 

 proper. Draw. 



(II) Cells. Remove one of the spinal ganglia and 

 tease in a drop of salt solution containing some 

 stain, or study prepared slides showing the 

 nerve cells. Look for large cells and note the 

 relation of the cells to the fibers. Is there a 

 nucleus in the cell? Draw. 



2. Organs. Having studied several of the fundamental 

 tissues one should be able to recognize them in organs. In 

 the following study observe what tissues are present and 

 how they are arranged : 



(a) Spinal Cord. In prepared slides of sections of the 

 spinal cord note the following points: shape, size, 

 surrounding membrane (pia mater), nerve roots, dorsal 

 fissure, ventral fissure, central canal, position of the 

 white matter, shape and position of the gray matter. 

 In the white matter will be found nerve fibers, con- 

 nective tissue, bloodvessels and corpuscles. In the 

 gray matter the nerve cells will be rather prominent. 



