At the lower part of the trunk, on each side, may be seen the large 

 muscle which, from the oblique direction of its fibres, is called, 



20. Outer Oblique Muscle of the Abdomen. 



Several muscles lie beneath it. The outline of one of these, 



21. Straight Muscle of the Abdomen, may be seen beneath the expanded 



tendon of insertion of the oblique muscle. These abdominal muscles, 

 by their contraction, possess the power of compressing the contents of 

 the abdomen. 



Muscles of the upper extremity. 

 16. Muscle that elevates the Arm (Deltoid Muscle). 



22. Biceps or Two-headed Muscle (see also page 70). 



23. Anterior Muscle of the Arm. This and the Biceps are for the purpose of 



bending the Fore -Arm 



24. Triceps, or Three-headed Muscle. This counteracts the last two muscles, 



for it extends the Fore-arm. 



25. Muscles that bend the Wrist and Fingers, and pronate the Fore-arm and 



Hand that is, turn the Hand with the palm downwards. They are 

 called the Flexor and Pronator Muscles. 



26. Muscles that extend the Wrist and Fingers, and supinate the Fore-arm 



and Hand that is, turn the Hand with its palm upwards. They are 

 called the Extensor and Supinator Muscles. 



27. Muscles that constitute the ball of the Thumb. They move it in different 



directions. 



28. Muscles that move the Little Finger. 



Muscles which connect the lower extremity to the pelvic bone. 

 Several are represented in the figure. 



29. Muscle usually stated to have the power of crossing one Leg over the 



other, hence called the Tailor's Muscle, or Sartorius; its real action is 

 to assist in bending the knee. 



30. Muscles that draw the Thighs together (Adductor Muscles). 



31. Muscles that extend or straighten the Leg (Extensor Muscles). The 



muscles that bend the leg are placed on the back of the thigh, so that 

 they cannot be seen in the figure. 



Muscles of the leg and foot: 



32. Muscles that bend the Foot upon the Leg, and extend the Toes. 



33. Muscles that raise the Heel these form the prominence of the calf of the 



Leg. 



34. Muscles that turn the Foot outwards. 



35. A band of membrane which retains in position the tendons which pass 



from the leg to the foot. 



36. A short muscle which extends the Toes. 



The muscles which turn the foot inwards, so as to counteract the 

 last named muscles, lie beneath the great muscles of the calf, which 

 consequently conceal them. The foot possesses numerous muscles, 

 which act upon the toes, so as to move them about in various direc- 

 tions. These are principally placed on the sole of the foot, so that 

 they cannot be seen in the figure. Only one muscle, 36, which assists 

 in extending the toes, is placed on the back of the foot. 



