164 



DISSECTION OF THE NECK. 



cervical vertebras (sixth, fifth, fourth, and third) Both parts of the mus- 

 cle are blended above, and the whole is insertedby four slips into the bodies 

 of the four upper cervical vertebrae. 



Some of the lowest fibres of the muscle are attached separately by ten- 

 don to the anterior transverse process of one or two of the lower cervical 

 vertebrae. 



Fig. 45. 



A. Longus medius. 



B. Rectus capitis auticus major, 

 c. Scalenus anticus. 



D. Scalenus medius. 



F. Scalenus posticus. 



G. Rectus capitis anticus minor. 



DEEP MUSCLES OF THE FRONT OF THE NECK AND THE SCALENI MUSCLES. 



In contact with the anterior surface of the muscle is the pharynx. The 

 inner border is at some distance interiorly from the muscle of the opposite 

 side, but superiorly only the pointed anterior common ligament of the ver- 

 tebrae separates the two. The outer border is contiguous to the scalenus, 

 to the vertebral vessels, and to the rectus capitis anticus major muscle. 



Action. Both muscles bend forwards the neck ; and the upper oblique 

 fibres of one will turn the neck and head to the same side, by the attach- 

 ment to the atlas. 



The RECTUS CAPITIS ANTICUS MAJOR (fig. 45, B ) is external to the 

 preceding muscle, and is largest at the upper end. Its origin is by pointed 

 tendinous slips, with the longus colli, from the summits of the anterior 

 transverse processes of four cervical vertebrae (sixth, fifth, fourth, and 

 third) ; and the fibres ascend to be inserted into the basilar process of the 

 occipital bone, in front of the foramen magnum. 



The anterior surface of the muscle is covered by the pharynx, and by 

 the carotid artery and the numerous nerves near the base of the skull. 

 Th<- muscle partly conceals the following one. At its insertion the rectus 

 is fleshy, and reaches from the middle line to the temporal bone. 



Action. Both muscles incline forwards the head; and one will bring 

 the face to the same side by rotating the head. 



