NECK. 121 



body. Means of union : Fibro-cartilnge and a supe- 

 rior and inferior common v^ertebral liii'Mment. 



That of tlie annular part : Double artlirodia. Artic- 

 ular surfaces : Articular facets. Means of union : Inter- 

 spinal ligament, inter annular ligament, two capsular, 

 superior spinal ligament (cervical portion) or ligamen- 

 tum nuclise, composed of a funicular cord and two 

 median sheets of yellow elastic tissue. Motion : Sliding. 



Special articulations — Atloido-occipital : Condy- 

 loid. Articular surfaces : Two condyles of tlie occipi- 

 tal, two cavities in front of the atlas. Ligaments : One 

 capsular with four reinforcing bands. Two synovial cap- 

 sulse, one for each condyle and cavity. Motion : Flex- 

 ion, extension, lateral inclination and circumduction. 



AxoiDO-ATLOiD. — Troclioid or lateral ginglymus. Ar- 

 ticular surfaces : A groove on tlie superior face of the 

 body of tlie atlas, and two facets on each side of it, the 

 inferior face of the odontoid process of the axis and the 

 two facets laterally. Ligaments : Superior and inferior 

 atloido-axoid ligaments, odontoid ligament, one capsu- 

 lar. One synovial capsnla. Motion: Rotation. 



MYOLOGY. 



Superior region : Seventeen muscles. 

 1. Cervical trapezium. — (See dorsal region, de- 

 scribed as cervical portion of t^e trapezium.) 



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