584 DISSECTION OF THE NECK. 



triangular space of the neck. The submaxillaiy gland is placed 



altogether in front of the vessels, and is partly concealed by the 



jaw ; beneath it, on the surface of the mylo-hyoid, is the small 



and thyroid nerve to that muscle, with the submental artery. By the side of 



body> the thyroid cartilage, between it and the common carotid artery, 



lies the thyroid body beneath the sterno-thyroid muscle ; in the 



iVmale this body is more largely developed than in the male. 



Parotid At the upper part of the neck, if the parts were not disturbed, 



would be the parotid gland, wedged into the hollow between 



the jaw and the mastoid process, and projecting somewhat below 



the level of the jaw. 



Lymphatic Several lymphatic glands, belonging to the deep cervical group, 

 glands. ]| e aj OD g the internal jugular vein, under cover of the sterno- 

 mastoid muscle ; and another set of smaller glands (sub-maxillary 

 lymphatic glands) is placed below the base of the jaw. 



Directions. The student has now to proceed with the examina- 

 tion of the individual parts that have been referred to in the 

 triangular spaces. 



Anterior ANTERIOR JUGULAR VEIN. This vein lies near the middle line 



jugular vein o f the neck, and its size is dependent upon the degree of develop- 

 ment of the external jugular. Beginning in some small branches 

 below the chin, the vein descends to the sternum, and then bends 

 outwards beneath the sterno-mastoid muscle, to open into the 

 external jugular, or into the subclavian vein. In the neck the 

 j oins anterior and external jugular veins communicate. There are two 



?xternai anterior jugular veins, one for each side, though one is usually 

 larger than the other ; and at the bottom of the neck they are 

 joined by a transverse branch (tig. 171, p. 467). 



In many subjects the lower part of the anterior jugular vein is 

 joined by a considerable branch which runs downwards, along 

 the anterior border of the sterno-rnastoid muscle, from the facial 

 vein. 



Sterno- The STERNO-CLEIDO-MASTOID MUSCLE (fig. 211, J ) forms the Sllpfcl'- 



muscie ficial prominence of the side of the neck. It is narrower in the 

 centre than at the ends, and arises below by two heads of origin 

 has its which are separated by an elongated interval. The inner, or 

 stern urn and s ^ erna ^ head is fixed by a narrow tendon to the anterior surface of 

 clavicle, the first piece of the sternum ; and the outer, or clavicular, 

 has a wide fleshy attachment to the inner third of the clavicle. 

 From this origin the heads are directed upwards, the sternal pass- 

 ing backwards, and the clavicular almost vertically, and join about 

 and inser- the middle of the neck in a flattened belly. Near the skull the 

 skull*: 1 muscle ends in a broad tendon, which is inserted into the mastoid 

 process at its outer aspect from tip to base, and by a thin aponeu- 

 rosis into a rough surface behind that process, and into the outer 

 part of the upper curved line of the occipital bone. 



position to The muscle divides the lateral surface of the neck into the 



other parts ; two main triangular spaces. On its cutaneous aspect it is 



covered by the integuments, the platysma, and the deep fascia, 



and is crossed by the external jugular vein, and by the great 



