JP'ig' 57' Region of the Neck, from in front. 

 Fig. 58. Region of the Neck, from the Side. 



The Neck, which extends from the lower border of the lower jaw to the 

 clavicle, and from the external occipital protuberance to the 7 th Cervical Vertebra, 

 may be divided into 3 regions, i paired and 2 unpaired: Anterior, Posterior and 

 2 Lateral regions. The anterior region of the Neck lies between the 2 Sterno-Cleido- 

 Mastoid Muscles; the lateral regions, between these muscles and the Trapezius; 

 the posterior corresponds to the area covered by the Trapezius, as far down as 

 the spinous process of the 7 th Cervical Vertebra (Vertebra Prominens). 



The anterior cervical region extends from the lower jaw to the upper 

 border of the Sternum. This region may be subdivided into Submaxillary, Hyoid, 

 Sub-hyoid (between the hyoid bone and the upper border of the thyreoid carti- 

 lage), Laryngeal, Tracheal (which the B. N. A. subdivided into Thyreoid 

 and Suprasternal) regions and Suprasternal notch. The area between the lower 

 jaw. Omohyoid and Sterno-mastoid Muscles forms a A which may be subdivided 

 into a Digastric A and a Carotid A- (The small space between the ramus of 

 the lower jaw and the origin of Sterno-Mastoid Muscle belongs to the head.) 



Anatomists' opinions differ as to whether the broad Sterno-Mastoid should 

 be regarded as a boundary line or as a special (Sterno-Cleido-Mastoid) region. In 

 any case the parts described in the regions bounded by this muscle lie deep to 

 it (vide infra). Between the Sternal and Clavicular heads of this muscle there 

 may be a little fossa (Fossa supraclavicularis minor). 



From the lateral cervical region a A is cut off b}' the inferior belly of 

 the Omohyoid (Inferior A of the neck). The boundaries of this A are formed 

 by the Clavicle, Sterno-Mastoid and Omohyoid Muscles. When the Sterno-Mastoid 

 is very broad, or present as Sterno-Cleido-Mastoid, if the Trapezius extends far 

 forwards (in some cases touching the Sterno-Cleido-Mastoid), then this A will be 

 very small or even absent. 



This A is made larger — e. g. for ligaturing the Subclavian Artery — , 

 by pressing the Clavicle (arm) downward and (if necessary), cutting the Omohyoid. 



A portion of the posterior Cervical Region may be termed, Regio-Nuchae. 



