THE MUSCLES 



51 



VOLUNTARY MUSCLE. 



(Striated or Striped.) 



INVOLUNTARY MUSCLE. 



(Non-striated or Unstriped.) 



MUSCLES OF THE 

 HEART. 



TOPICAL OUTLINE 



Under the control of the will. 



Composed of bundles of fibres. 



These bundles composed of smaller bundles 

 (fasciculi), visible to the unaided eye, and 

 surrounded by sheaths. 



Fasciculi composed of fibres. Average diame- 

 ter about 55 in. 



Fibres made up of minute fibrillse (fibrils) . 



Fibrillae composed of disc-like bodies, and are 

 consequently striated transversely. 



Not under the control of the will. 



Found chiefly in the muscular walls of the 



internal organs and vessels. 

 Fibres composed of elongated cells with 



pointed ends, not marked transversely. 



Involuntary, yet striped or striated. 

 Striated longitudinally as well as tran&- 



versely. 

 Fibres composed of oblong and branched cells. 



TABLE OF THE PRINCIPAL MUSCLES 

 (SEE FIGURE 11, PAGE 32) 



The Head 



Oc-cip'i-to fron-ta'lis, moves the scalp and eyebrows. 



Or-bic-u-la'ris pal'pe-brae, closes the eye. 



Le-va'tor pal'pe-brae, opens the eye. 



The Recti muscles (four in number) move the eyeball. 



Tem'po-ral, 



Mas-se ter, 



The Neck 



Pla-tys'ma My-oi'des, J moye the head forwards . 

 Ster'no Mas toid, 

 Sca-le'ni muscles move the neck from side to side. 



The Trunk 



Pec-to-ra'lis, moves the arm forwards. " 



La-tis'si-mus dor'si, moves the arm backwards. 



Tra-pe'zi-us, \ 



Ser-ra'tus mag'nus, > move shoulder-blade. 



Rhom-boi-de'us, 



In-ter-cos'tals, move the ribs in respiration. 



f X . tem f nKr iqUe ' ! move the trunk forwards. 

 Internal Oblique, ) 



E-rec'tor spi'nas, move the trunk backwards. 



