144 



THE MUSCULAR TISSUE. 



be found in the flexors, extensors, and rotators of the limbs; 

 from attachment in the muscles, connected with the styloid 

 process of the temporal bone, the hyoid bone, the tongue, 

 and pharynx, and named the stylo-hyoideus, stylo-glossus, 

 and stylo-pharyngeus; from direction in the straight mus- 

 cles of the thigh, the oblique of the neck, and transverse 

 of the abdomen and perineum; how figure in the rhomboi- 

 dei or four-sided muscles of the back, and the scaleni or 

 unequal-sided triangular muscles of the neck ; from compo- 

 sition in the biceps, triceps, perforans, &c., as they are 

 composed of two heads, three heads, or are perforated. 



The attachment of muscles is various. They are at- 

 tached to the skin, as in the platysma myoides of the neck, 

 to other muscles as in the angles of the mouth, to cartila- 

 ges as in the chest and larynx, to aponeuroses, to tendons, 

 and through these to the periosteum and bones. The at- 

 tachment of muscles to the most fixed point is called their 

 origin, while that to the most movable is regarded as their 

 insertion. 



The structure of muscles consists of bundles of fibres 

 called fasciculi, enclosed in a cellular membrane or sheath. 

 Each fasciculus is composed of still smaller bundles, and 

 these again of single and more minute filaments; and here 

 the microscope is brought FIG. 26. 



in to determine what is 

 called the ultimate fibre. 

 (Fig. 26.) 



This ultimate fibre is 

 found to consist of a num- 

 ber of still smaller fibres 

 called the ultimate fibrils, 

 which are enclosed in a 

 very delicate sheath termed the myolemma or sar co-lemma. 



FIG. 26 represents the Muscular Fibre of animal and organic life a mus- 

 cular fibre of animal life enclosed in its sheath, the myolemma, and showing 

 the transverse striae ; fe Ultimate fibril of the same ; c A more highly mag- 

 nified Tiew of Fig. a ; d Muscular fibre of organic life, from the urinary blad- 

 der, magnified 600 diameters ; e Muscular fibre of organic life, from the 

 stomach. 



