MUSCLES OF THE NECK 321 



Sterno-Maxillaris. — This is a long, narrow muscle situated in front 

 of the neck, along the entire length of which it runs from the breast below 

 to the lower jaw above. Its inferior portion is united with its fellow on the 

 opposite side. About the middle of the neck they separate and pass upward 

 and outward to their destination. The jugular vein runs on the outer border 

 of this muscle. 



Or-igin. — From the cariniform cartilage in front of the sternum. 



Insertion. — By a short, flattened tendon into the angle of the lower jaw. 



Action. — When acting with its fellow it draws the head downward. 

 Acting alone, it jDulls it to one side. 



SternO-Thyro-Hyoideus. — A long slender muscle, which becomes 

 tendinous about the middle of the neck and then divides into two thin, 

 narrow, muscular branches. It passes along in front of the trachea or 

 windpipe. 



Origin. — Joined with its fellow on the opposite side, it arises from the 

 cariniform cartilage in front of the sternum. 



Insertion. — By one division into the posterior border of the thyroid 

 cartilage of the larynx, by the other into the body of the hyoid or tongue 

 bone. 



Action. — To depress the hyoid bone and larynx. 



Subscapulo-Hyoideus. — A long, flat, narrow muscle, passing obliquely 

 up the neck from beneath the scapula or blade-bone to the space between 

 the branches of the lower jaw. 



It separates the jugular vein from the carotid artery in the upper 

 half of the neck. 



Origin. — By a thin, flat tendon from the fascia on the under surface of 

 the scapula. 



Insertion. — Into the body of the hyoid bone (bone of the tongue). 



Action. — To draw the hyoid bone downwards. 



Rectus Capitis Anticus Major. — Situated at the side and front of 

 the upper part of the neck, it extends from the fifth cervical vertebra to 

 the base of the skull. 



Origin. — From the transverse processes of the 3rd, 4th, and 5th bones 

 of the neck. 



Insertion. — Into the base of the skull at the junction of the basilar 

 process of the occiput with the sphenoid bone. 



Action. — To draw the head to one side, or to flex it, according as it acts 

 by itself or with the corresponding muscle on the other side. 



Rectus Capitis Anticus Minor. — A small, flat, fleshy muscle placed 

 beneath the articulation of the head with the neck. 



Origin. — From the under surface of the atlas. 



Vol. II. SS 



