58 ANATOMY. 



Capsular f from the edge of the glenoid cavity and the eminentia articularis 



to the neck of the inferior maxillary condyle. 



Nerves are derived from the auriculo-temporal and masseteric branches of 

 the inferior maxillary. 



Describe the Costo-vertebral Articulations. They are each a double ar- 



throdia between the head of the rib and the bodies of 2 adjacent vertebrae, 



except in the 1st, loth, nth, and I2th ribs, which are each a single arthrodia, 



as they articulate with but I vertebra each. Their ligaments are 3, viz. 



Anterior Costo-vertebral? or Stellate Ligament, consists of 3 bundles, 



which fasten the anterior part of 



FlG> 3I> _ the head of the rib to the inter- 



vertebral disk and the 2 adjacent 

 bodies. 



Inter-articular Costo-vertebral, in the 

 interior of the joint, from the crest 

 on the head of the rib to the inter- 

 vertebral disk; on each side there 

 is a separate synovial membrane. 

 Capstdar, surrounding the articular 



surfaces. 



Describe the Costo-transverse Articulations. They are 10 arthrodial articu- 

 lations between the tubercles of the first 10 ribs and the transverse processes 

 of the vertebrae next below. Their ligaments are 3, viz. Anterior, Middle, 

 and Posterior Costo-transverse. 



Describe the Costo-sternal Articulations. One a syn arthrodial, 6 are ar- 

 throdial articulations, between the costal cartilages and the margin of the 

 sternum. The first has no synovial membrane, the second only has an inter- 

 articular fibro-cartilage. Each has 3 ligaments, the Anterior and Posterior 

 Costo-sternal, and a Capsular. The Costo-xiphoid Ligament connects the xiphoid 

 appendix to the cartilage of the 6th or 7th rib. 



How are the Costal Cartilages connected with the ribs and with each 

 other ? With the ribs by a depression on the end of each rib, strengthened by 

 the blending together of the periosteum and the perichondrium. The carti- 

 lages of the lower ribs, sometimes from the 5th to the loth inclusive, articu- 

 late with each other by their borders and for each a capsular and an intercostal 

 ligament, with 3 synovial membranes for the 3 articulations between the 

 6th and the Qth cartilages. 



What are the Ligaments of the Sternum ? An anterior sternal and a 

 posterior sternal ligament, with a layer of cartilage betv/een the manubrium 

 and the gladiolus. 



