72 ANATOMY FOE NURSES. [CHAP. VI. 



In order to bring about a muscular contraction the muscle 

 must be stimulated. The way in which a muscle is normally 

 stimulated is through its nerve, which conducts the nerve 

 impulses from the central nervous system to the muscle fibres. 

 Arriving at the latter, the nerve impulses bring about the 

 complex chemical changes upon which the contraction of the 

 muscle depends. When the nerve impulses cease, the muscle 

 relaxes again. 



TABLE OF CHIEF MUSCLES. 



Occipito-frontalis. HEAD. 



Temporal, -j 



Masseter. j- Muscles of Mastication. 



Pterygoids. J 



Exterior rectus. ^ 



* Interior rectus. FACE. 



J Superior rectus. 

 4 Inferior rectus. > Muscles of the 



^Superior oblique. 

 ({Inferior oblique. J 



Genio-arlossus. 1 , $- 



\ TONGUE. 

 Stylo-glossus. J 



Sterno-cleido-mastoid. NECK. 



Intercostals. 



Subcostals. 



Levatores costarum. r THORAX. 



Pectoral major. 



Pectoral minor. 



Diaphragm. BETWEEN THORAX AND ABDOMEN. 



Obliquus extern us abdominis. 1 



Obliquus internus abdominis. i ABDOMEN 



Transversalis abdominis. 



Rectus abdominis. 



Trapezius. "1 ^ 



Latissimus dorsi. j 

 Deltoid. SHOULDER. 

 Biceps flexor cubiti. 1 ^ 

 Triceps extensor cubiti. J 



Pronators (2). 



Supinators (2). 



Flexors of the wrist (2). , 



Flexors of fingers and thumb (3). 



Extensors of wrist (3). i 



Extensors of fingers and thumbs (6). 



