260 



THE ARTICULA TIONS 



branch of the external circumflex; the anterior recurrent branch from the anterior 

 tibial; and the posterior tibial recurrent. 



Tlie nerve-supply comes from the great sciatic, anterior crural, and obturator 

 sources. The great sciatic gives off the internal and external popliteal; the internal 

 l)opliteal sends t\v(), sometimes three branches — one with the azygos artery; one 

 ■with the inferior internal, and sometimes one with the superior internal articular 

 arterv; the external popliteal gives a brancli which accompanies the superior, and 

 another which accompanies the inferior articular artery, and a recurrent branch 



Fig. 249. — Vertical Section of the Kxee-.joixt in the Axtero-posteriok Dikectiox. 

 (The bones are .somewhat diawu apart.) 



Fatty tissue 

 Opening in synovial 

 membrane behind 

 crucial ligament 

 leading into inner 

 half of joint 

 Synovial membrane re- 

 flected off crucial liga- 

 ments 

 Cut end of anterior cru- 

 cial ligament 

 Posterior crucial liga- 

 ment 

 Ligament of Winslow 



Muscular fibres of quadriceps 

 extensor 



Extension of synovial sac of knee 

 upon femur 



t ' \ _ Tendon of quadriceps extensor, 

 \ j.\\\' forming fibrous capsule of joint 



Pre-patellar bursa 



CONDYLE OF FEMUR (INNER. 



Iiigamentum mucosum 



Fatty tissue between 

 ligamentum patellae 

 and synovial sac 



Bursa beneath ligamentum 

 patellae 



which follows the course of the anterior recurrent branch of the anterior tibial 

 artery. The anterior crural sends an articular branch from the nerve to the vastus 

 externus; a second from the nerve to the vastus internus; and sometimes a third 

 from that to the crurcus. Thus there are three articular twigs to the knee derived 

 from the nuiscular liranclics of the anterior crural. (Roger ^^'il]iams, Journ. Anat. 

 Physiol., 1879.) The obturator Viy its deep division sends a branch tliroiigh the 

 adductor magnus on to tlie ix.pliteal artery, which enters the joint through the 

 posterior ligament. 



The movements which occur at thf knee-joint are flexion and extension, with 



