234 



THE MUSCLES. 



The muscular fibres which are continued by the fibrous fasciculi 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. 14-9. 



PRIMITIVE MUSCULAR FIBRE FROM 

 THE FOOT OF I HE LUCANUS 

 STAG-BEETLE —A COMPLICATED 

 CONTRACTILE SKGMENT, MADE 

 TENSI-: BV THE INTERSTITIAL 

 INJECTION OF STRONG ALCOHOL. 



N, Muscular nucleus ; S, 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 FIBRES 

 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-pmniform muscle. 



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

 form a,pmnated or penniform muscle (Fig. 152, D). 



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

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



' From Kcuaut's work already mentioned. 



