J3 



Hitchcock's anatomy 



Fig. 21. 



an inch in diameter, less often than the blood cor- 

 puscles. In some other animals they are larger, 

 as may be seen in the capillary plexus of a frog's 

 foot, shown in Fig. 9. The lymphatics abound 

 with valves, <*s may be seen in Fig. 21. 



6. Muscular Tissue. 

 74. Striped and Smooth Muscle. — This tissue 

 is made up of two forms of fiber, the striped and 

 unstriped. The stripes in the first form run both 

 transversely and longitudinally, as may be seen 

 Pig. 22. 



iiG. 23. 



in Fig. 22. When separated longitudinally, the 

 fibrillae have a beaded appearance, each bead 

 being in fact a cell, as is here represented in 

 Fig 23, which shews the cells a when most 

 relaxed, and b when most contracted. Muscular 

 fiber is capable also of being divided crosswise 

 in the direction of the transverse striae into discs, 

 as seen in Fig. 24. Both the striated (striped) 

 and non-striated muscles originate in cells. 

 Figs. 25 and 26 show their development. 



75. Myotility. — The grand peculiarity of 

 muscular tissue is its power* of contraction — a 

 phenomenon as mysterious and wonderful as 

 any thing in nature. This is called myotility 

 or contractility. 



What do the lymphatics abound in ? 74. Distinguish between the striped and the 

 unstriped muscular fiber. Give the reason of the difference between a and t> in Fig. 23. 

 75. Define myotility. 



