72 



MUSCLES OF THE CHEST. 



Fig. 58. 



dorsal vertebrae, and the transverse processes of the five lower . 



vical. Insertion, into the bodies 

 of all the cervical vertebrse. Use; 

 bends the neck forwards and to one 

 side. 



Rectus capitis anticus major. '^ — 

 (See Fig. 58.) Origin, from the 

 transverse processes of the third, 

 fourth, and fifth cervical ver- 

 tebrae. Insertion, into the basilar 

 or cuneiform process of the occiput. 

 TJse; bends the head forwards. 



Rectus capitis anticus minor * — 

 Origin, from the atlas near its trans- 

 verse process. Insertio?i, into the 

 basilar process of the occiput. TJse ; 

 bends the head forwards. 



Rectus capitis lateralis}^ — Ori- 

 gin, from the transverse process of 

 the atlas. Insertion, between the 

 condyle and jugular eminence of 

 the occipital bone. JJse ; draws the 

 head to one side. 

 Scalenus anticus.^ — Origi?!, from the transverse processes of the 

 fourth, fifth, and sixth cervical vertebrse, tendinously. Insertion, 

 into the upper surface of the first rib in front of the groove for the 

 subclavian artery. Use; bends the neck forwards, or raises the 

 first rib. 



Scalenus medius? — Origin, from the transverse processes of all 

 the cervical vertebrse tendinously. Insertion, into the upper surface 

 of the first rib, behind the groove for the artery. Use; same as 

 last. 



Scalenus posticus.^ — Origin, from the transverse processes of 

 the fifth and sixth cervical vertebrae. Insertion, into the upper face 

 of the second rib beyond the tubercle. Use ; bends the neck, and 

 raises the second rib. 



MUSCLES OF THE CHEST. 



Pectoralis major. — Forms the cushion of the chest. Origin, from 

 the two upper bones of the sternum, the sternal two-thirds of the clavicle, 

 the cartilages of the fifth and sixth ribs, and from the tendon of the ex- 

 ternal oblique muscle. Insertion, into the outer edge of the bicipital 

 groove of the humerus. Use; draws the arm inwards and forwards. 



Pectoralis minor.^ — Origin, from the third, fourth, and fifth ribs. 

 Insertion, into the inner face of the coracoid process of the scapula. 

 Use ; draws the scapula inwards and downwards. 



