108 MUSCULAR SYSTEM. 



OBLIQUUS CAPITIS INFERIOR. — Axo'ulo-CUloideuS. 



Situation. — Deep-seated ; upon the supero-anterior and la- 

 teral parts of the neck. 



Figure. — A near approach to a parallelogram. 



Attachment. — To the side of the spine of the vertebra den- 

 tata; and to the supero-posterior part of the body of the atlas. 



Relations. — On the outer side, with the tendon of the sple- 

 nius: on the irjner, with the ligamentum colli and complexus 

 minor: superiorly, with the complexus major; inferiorly, with 

 the capsular ligament of the articulation formed between the first 

 and second vertebrse. 



Structure.— Th\ck, and almost entirely fleshy. 



Action. — When both muscles act, the atlas (and the head 

 along with it) will be elevated. By their alternate action, a sort 

 of rotatory motion is given to the head. 



4.— INFERIOR CERVICAL REGION. 



STERN O-MAXILLARIS. 



Situation. — Inferior part of the neck. 



Form — Elongated ; cylindroid ; flattened above and below. 



Attachment. — Posteriorly, to the cariniform cartilage of the 

 sternum ; anteriorly, to the angle of the lower jaw. 



Relations. — Externally, with the cellular faschia of the neck, 

 panniculus and levator humeri; internally, with the next muscle, 

 trachea, and carotid artery ; along its superior margin, with the 

 jugular vein ; along its inferior border (the posterior half) with 

 its fellow; from which it gradually diverges to the head, leaving 

 the trachea and next muscle exposed in the interspace formed by 

 the divergence. Its tendon passes between the parotid and sub- 

 maxillary glands. 



Direction. — Longitudinal : curving with the neck. 



Structure. — Tendinous and fleshy at the sternal end, and in- 

 timately united with its fellow. About three-fourths of the ex- 

 tent of the neck upwards, it terminates in a flat tendon. 



Action. — To inflex the head towards the breast. If one 

 muscle act alone, it will, at the time of this inflection, incline the 

 head to one side. The pair will also assist in opening the mouth. 



, Sterno-huoideus. 



STERNO-TIIYRO-HYOIP'^'''^ <* '^ 



SSt 



i Sterno-thyroideus. 

 Situation.— AhovQ the preceding muscle. 



Form. — Elongated, slender, cylindroid ; flattened above and 

 below ; trigastric ; but unequal in its divisions. 



Attachment. — Postcnorly, to the cariniform curtilage of the 



