THE MUSCLES. 



The muscular fibres which are continued by the fibrous fascicuK may be 

 divergent or parallel. In the first case — the diaphragm, for example — the con- 

 nective fibres run in the same direction as the muscular fibres. In the second 

 case several arrangements may be observed : 



1. Tendons may pass in the same direction as the muscular fibres. This is the 

 most simple manner (Fig. 152, A). 



Fig. 150.' 

 Fig. 149. 



PRIMITIVK MUSCCTLAR FIBRE FROM 

 THE FOOT OF THE LUCAN03 

 STAG-BEETLE —A COMPLICATED 

 CONTRACTILE SEGMENT, MADE 

 TENSE BY THE INTERSTITIAL 

 INJECTION OF STRONG ALCOHOL. 



K, Muscular nucleus ; 8, sarcolem- 

 ma; SM, limits of a contractile 

 segment of muscular substance ; 

 DE, limits of a thick disc system 

 enclosing discs ; Ep, principal 

 thick disc ; Ea, Ea, thick acces- 

 sory discs ; Bi, intervening 

 bright bands of the thick discs ; 

 BC, limits of the system of the 

 bright band containing — Mp, 

 the thin principal disc, and Ma, 

 Ma, the two thin accessory discs ; 

 /, /, /, lines of longitudinal 

 striation indicating the limits 

 of the fibrillar fasciculi. 



RELATION OF THE PRIMI- 

 TIVE MUSCULAR FIBRE3 

 WITH THE TENDON OF 

 THE STERNO - HYOID 

 MUSCLE OF THE FROG. 



F, Ordinary primitive 

 fibres ; f', muscular 

 prolongation ; T, ten- 

 don of insertion. 



2. Muscular fasciculi, passing altogether from the same side to become united 

 into a tendinous cord (Fig. 152, B and C), constitute a semi^enmfonn muscle. 



3. Muscular fasiculi maybe implanted to right and left of the tendon, and 

 form ^pennated ov penniform muscle (Fig. 152, D). 



These various aiTangements of the muscular fibres with their tendons demon- 

 strate the necessity of not confounding the length of the fleshy body of a muscle 



' From Eenaut's work already mentioned. 



