SUPERIOR CERVICO-OCCIPITAL REGION" 437 



transverse processes and spines of the six anterior dorsal vertebrpe. Insertion 

 • — to the obHque pi'ocesses of all the cervical vertebrae, wing of the atlas, 

 tubercle on the occipital crest, lateral parts of the ligamentum nvichce, and 

 by blending with the tendon of the splenius to the mastoid process of the 

 petx'ous portion of the temporal bone. Action — to erect the head. 



Traciielo mastoideus is deeply seated under the splenius. Ori(jin — 

 from the transverse processes of the two anterior dorsal spines. Insertion 

 — to the oblique processes of all the cervical vertebrae, wing of the atlas, 

 and mastoid process of the petrous portion of the temporal bone. Action 

 — similar to the splenius. 



Spinalis colli lies close to the bodies of the vertebrte, between their 

 oblique and spinous processes. Orvjin — from the oblique processes, of the 

 five posterior cervical vertebrte and the first dorsal. Lwcrtion — to the 

 spinous processes of all the cervical vertebrce but the atlas. Action — to bend 

 the neck upwards and backwards. 



INFERIOR CERVICAL REGION 



Sterno-maxillaris is situated on the inferior part of the neck. Origin 

 — from the supero-anterior part of the cariniform cartilage. Insertion — 

 (opposite the thyroid body it becomes tendinous) to the posterior angle 

 of the inferior maxillary bone. Action — to depress the lower jaw, and, 

 through it, the whole head. 



Sterno-thyro hyoideus is situated above the sterno-maxillaris. Origin 

 — from the infero-internal part of the first rib, and from the supero-anterior 

 part of the carinifoi'm cartilage. Insertion — half-way up the neck it 

 bifurcates, one part going to the postero-external part of the body of the 

 thyroid cartilage, the other to the spur process of the os hyoides. Action 

 — to draw the tongue and larynx backwards and downwards. 



Subscapulo hyoideus is situated on the antero-superior part of the neck. 

 Origin — from the supero-internal part of the body of the humerus, just 

 below the inner tubercle. Insertion — to the under side of the root of the 

 spur process of the os hyoides. Action — to depress the os hyoides, or if that 

 is fixed, to aid the last muscle in lowering the head. 



SUPERIOR CERVICO-OCCIPITAL REGION 



Five pairs of small and short muscles connect the atlas and dentata 

 with the head, occupying the space known as the poll. These are com- 

 plexus minor, rectus capitis posticus major and minor, obliquus capitis 

 superior and inferior. Their action is to raise the head and preserve the 

 union of the bones intact. 



Scalenus connects the first rib with the two posterior cervical verLebrte. 

 Action — to depress the neck, and, when that is fixed, to raise the first rib 

 in forcible inspiration. 



LoNGUS COLLI is deeply seated on the under side of the vertebra. lo arises 

 by fleshy digltations from the bodies of the six anterior dorsal vertebra, and 



