14 1 



AETICULATIONS OF THE HEAD. 



TEMPOEO- MAXILLARY ARTICTJLATION. 



The lower jaw articulates by its condyle on each side with the smooth 

 surface of the temporal bone, extending over the part of the yienoid 



Ficr. I no. 



Fig. ICO. A I'ORTION OF THK 



Skull ■with the Lower Jaw 

 ANi> Hyoid Bone, seen froji 



THE RIGHT AND OUTER SIDE. 



(A. T., after Arnold.) i 



1, tlie external lateral ligament ; 

 2, a part of the capsule of the 

 joint ; 3, styloid process ; 4, stylo- 

 maxillary ligament ; 5, stylo-hyoid 

 ligament ; 6, lesser cornu of the 

 hyoid bone with some short liga- 

 ments attaching it to the body 

 and great cornu ; 7, the body ; 

 8, the great cornu. 



fossa in front of the Glaser- 

 ian fissure and the anterior 

 root of the zygoma. The 

 joint is divided by an in- 

 terarticular fibro-cartilage 

 into an upper and a lower 

 synovial cavity. 

 The external lateral ligament is a short fasciculus of fibres, 

 attached above to the external surface and the tubercle of the zygoma ; 



Fig. 131, 



Fig. 131. A PORTION OP THE SkULIi 



AND Lower Jaw with half the hyoid 



BONE, seen from THE INSIDE, (A. T.) i 



The numbers are the same as in Fig. 

 130 ; 3, the styloid i^rocess, detached from 

 the skull ; 7, the posterior and inner sur- 

 face of the right half of the body of the 

 hyoid bone ; 9, the internal lateral liga- 

 ment of the temporo-maxillary joint ; 10, 

 the upper opening of the inferior dental 

 canal. 



and below, to the external surface 

 and posterior border of the neck 

 of the lower jaw, its fibres being 

 directed downwards and back- 

 wards. Thin and short additional 

 ligamentous fibres cover the syno- 

 vial mem])rane in front and on the 

 inside, forming an irregular cap- 

 sule round the joint. 

 The internal lateral ligament, tliin, loose, and elongated, lies at 

 some diSLcvUce from the joint. It extends fi'om the spinous process of 

 the sphenoid bone downwards and a little forwards, to be attached to 

 the inner border of the inferior dental foramen. Between it and the 

 lower jaw are placed the external pterygoid muscle, the internal max- 

 illary artery, and the inferior dental nerve. It has no immediate 



