1042 



A MANUAL OF ANATOMY 



body of the ist thoracic vertebra, and the upper band to the body 

 of the 7th cervical. In each of the loth, nth, and 12th joints the 

 lower band passes to the body with which the head of the rib 

 articulates, and the upper band to the body of the vertebra above. 



The capsular ligament is incomplete, and consists of thin loose 

 fibres, which cover the posterior, superior, and inferior aspects of 

 the joint. 



The interarticular ligament consists of short stout fibres, which 

 extend from the ridge on the head of the rib, separating the two 

 facets, to the intervertebral disc. It divides the joint into two 

 complete synovial cavities, and it is wanting in the ist, loth, nth, 

 and 12th joints. 



There are two distinct synovial membranes in those joints which 

 are provided with an interarticular ligament, namely, from the 



Posterior Band of Superior 

 Costo-transverse Ligament 



Anterior Band of Superior 

 Costo-transverse Ligament 



Anterior Costo-centralV 

 or Stellate Ligament T 



Interarticular Ligament 



Anterior Common 



Ligament. 



.Intervertebral Disc 



Fig. 432. — Ligaments of the Bodies of the Vertebrae and Right 

 costo-central joints. 



2nd to the gth . inclusive, one being above the ligament and the 

 other below it. In those joints in which the interarticular ligament 

 is absent, namely, the ist, loth, nth, and 12th, there is only one 

 synovial membrane. 



Arterial Supply. — Branches from the intercostal arteries. 



Nerve-supply. — Branches from the intercostal nerves. 



Costo-transverse Articulations.— These belong to the class diar- 

 throsis, and to the subdivision arthrodia. The articular surfaces 

 are the facet on the tubercle of the rib and the facet on the anterior 

 aspect of the extremity of the transverse process of the thoracic 

 vertebra. 



