SUPERFICIAL CERVICAL REGION. 



253 



1. Superficial Region. 



Platysma myoides. 

 Sterno-cleido-mastoid . 



2. Infra-hyoid Region. 



Depressors of tJie Os Hyoides and 

 Larynx. 



Sterno-hyoid. 

 Sterno-thyroid. 

 Thyro-hyoid. 

 Omo-hyoid. 



3. Supra-hyoid Region. 



Elevators of the Os Hyoides and 

 Larynx. 



Digastric. 

 Stylo-hyoid. 

 Mylo-hyoid. 

 Genio-hyoid. 



4. Lingual Region. 

 Muscles of the Tongue. 

 Genio-hyo-glossus. 

 Hyo-glossus. 

 Liugualis. 

 Stylo-glossus. 

 Palato-glossus. 



5. Muscles of the Pharynx. 

 Constrictor inferior. 

 Constrictor medius. 

 Constrictor superior. 

 Stylo-pharyngeus. 

 Palato-pharyngeus. 



6. Muscles of the Soft Palate. 

 Levator palati. 

 Tensor palati. 

 Azygos uvulae. 

 Palato-glossus. 

 Palato-pharyngeus. 



7. Muscles of the Anterior Vertebral 



Region. 



Rectus capitis anticus major. 

 Rectus capitis anticus minor. 

 Rectus lateralis. 

 Longus colli. 



8. Muscles of the Lateral Vertebral 



Region. 



Scalenus anticus. 

 Scalenus medius. 

 Scalenus posticus. 



9. Muscles of the Larynx. 

 (Included in the description of the 

 Larynx.) 



1. SUPERFICIAL CERVICAL REGION. 

 Platysma Myoides. Sterno-cleido-mastoid. 



Dissection. A block having been placed at the back of the neck, and the face turned to the 

 side opposite to that to be dissected, so as to place the parts upon the stretch, two transverse 

 incisions are to be made : one from the chin, along: the margin of the lower jaw, to the mastoid 

 process ; and the other along the upper border of the clavicle. These are to be connected by an 

 oblique incision made in the course of the Sterno-mastoid muscle, from the mastoid process to 

 the sternum; the two flaps of integument having been removed in the direction shown in fig. 147, 

 the superficial fascia will be exposed. 



The superficial cervical fascia is exposed on the removal of the integument from 

 the side of the neck ; it is an extremely thin aponeurotic lamina, which is hardly 

 demonstrable as a separate membrane. Beneath it is found the Platysma myoides 

 muscle, the external jugular vein, and some superficial branches of the cervical 

 plexus of nerves. 



The Platysma Myoides (fig. 148) is a broad thin plane of muscular fibres, placed 

 immediately beneath the skin on each side of the neck. It arises from the clavicle 

 and acromion, and from the fascia covering the upper part of the Pectoral, Deltoid, 

 and Trapezius muscles ; its fibres proceed obliquely upwards and inwards along the 

 si'lo of the neck, to be inserted into the lower jaw beneath the external oblique 

 line, some fibres passing forwards to the angle of the mouth, and others becoming 

 lost in the cellular tissue of the face. The most anterior fibres interlace, in front 

 of the jaw, with the fibres of the muscle of the opposite side ; those next in order 

 become blended with the Depressor labii inferioris and the Depressor anguli oris ; 

 others are prolonged upon the side of the cheek, and interlace, near the angle of 

 the mouth, with the muscles in this situation, and may occasionally be traced to 

 the Zygomatic muscles, or to the margin of the Orbicularis palpebrarum. Beneath 



