ARTICULATIONS. -LIGAMENTS. 



47" 



The rule is, the articular part of the costal tubercle articulates uith the trans- 

 verse process of tlu- lower of the two vertebra- with which the head of the 

 rib articulates ; thus, the first articulates with the first, the second witli tin- 

 second, and the third with the third. 



Arc tlic re any exceptions to tlic rule governing the articulation of transverse />;- 

 cesses and articular parts of costal tubercles .' 



Yes ; the eleventh and twelfth ribs do not articulate with the trans' 

 processes. 



ILntiincratc tlic articulations of the ribs <v//// ///< vertebra. 



(i) Costocentral, between heads of ribs and bodies of vertebra; ; (2) costo- 

 transverse, between tubercles of ribs and transverse processes. 



COSTOCENTRAL ARTICULATION LIGAMENTS. 



1. Class. Diarthrosis, because of capsule and free movement. 



2. Subdivision. Condylarthrosis, there being absent axial rotation. 



3. Osteological Units. A rib and a vertebra. 



4. Sitbdivisiona! l\trts. Head of a rib, centrum, and cartilage. 



Laminar portion of inter- 

 vertebral disc 



Anterior costo-central 

 or stellate ligament 



Coato-oeutral synovial 



Central pulpy portion of inter- 

 vertebral diao 



Middle cqsto-trans- 

 verae ligament 



Costo-transverse synovial Bao 



Posterior costo-transverse 

 ligament 



FIG. 346. HORIZONTAL SECTION THROUGH THK INTERVKRTEIIRAI. Disc AM> Kins. 



5. Basis. A capsule lined by synovial membrane. 



6. Subdivisions. Interarticular and costocentral or stellate ligaments. 

 Front vvliat point to u'liat point does tlic intcrarticular ligament extend .' 

 From the interarticular cartilage to the horizontal ridge on the head of the 



rib, between the articular surfaces of the same. 



From ic/Kit point to ichat point does the stellate ligament extend .' 



From the front of the head of a rib, externally, to the bodies and cartilage 

 with which the head articulates. 



Of hem' many parts docs the articulation between the head of the rib and the 

 centrum consist / 



This cavity is divided into two distinct parts by the interarticular ligament. 



COSTOTRANSVERSE ARTICULATION LIGAMENTS. 



Class. Diarthrosis, because of free motion and a capsule. 

 Subdivision. Arthrodia, because motion is simple and gliding. 

 Ostcological Units. A rib and a vertebra. 



