TEMPOR OMANDIB ULAR AR TICULA TION 



279 



V. Temporomandibular Articulation (Articulatio Mandibularis) . 



This is a ginglymo-arthrodial joint; the parts entering into its formation on 

 each side are, above, the anterior part of the glenoid cavity of the temporal bone 

 and the eminentia articularis; and, below, the condyle of the mandible. The 

 ligaments are the following: 



External Lateral. 

 Internal Lateral. 



Articular Disk. 



Stylomandibular. 

 Capsular. 



The external lateral ligament (ligamentum temporomandibulare) (Fig. 229) 

 is a short, thin, and narrow fasciculus, attached, above, to the outer surface of 

 the zygoma and to the tubercle OH its lower border; below, to the outer border of 

 the neck and to the tubercle at the outer extremity of the condyle of the mandible. 

 It is broader above than below; its fibres are placed parallel to one another, 



FIG. 229. Temporomandibular articulation. 



and directed obliquely downward and backward. Externally, it is covered by 

 the parotid gland and by the integument. Internally it is in relation with the 

 Capsular ligament, of which it is an accessory band, and from which it is not 

 separable. 



The internal lateral ligament (ligamentum sphenomandibulare} (Fig. 230) is 

 a flat, thin band which is attached above to the spinous process of the sphenoid 

 bone, and, becoming broader as it descends, is inserted into the margin of the 

 dental foramen and the portion of bone, the lingula, which overhangs the fora- 

 men in front. Its outer surface is in relation, above, with the External pterygoid 

 muscle; lower down it is separated from the neck of the condyle by the internal 

 maxillary artery; and still more inferiorly, the inferior dental vessels and nerve 

 separate it from the ramus of the mandible. The inner surface is in relation 

 with the Internal pterygoid. 



