ARTICULATIONS. LIGAMENTS. 451 



Give comparative size of the cuneiform />i>/ie.\-. 



The internal cuneiform is the largest bone ; the middle cuneiform is the 

 smallest bone ; the external cuneiform is intermediate in si/.e. 



Name the principal muscular-traction point* in and about the tarsus, and indi- 

 cate the muscle attached thereto. 



(i) Calcaneum for the tendo Achillis ; (2) calcaneum for the abductor hallucis 

 and flexor brevis digitorum ; (3) calcaneum for the abductor minimi digiti and 

 accessorius ; (4) calcaneum for the extensor brevis digitorum ; (5) sustcntaculum 

 tali groove for the tendon of flexor longus hallucis ; (6) the tuberosity of the 

 scaphoid bone for the tibialis posticus ; (7) the internal cuneiform for the tibialis 

 anticus ; (8) the first metacarpal for the peroneus tertius and tibialis anticus ; 

 (9) the fifth metatarsal for the peroneus brevis ; (lo)cuboidal groove for the ten- 

 don of peroneus longus. 



Locate the mcdio-tarsal articulation by limitation, and name its ligaments. 



This joint is limited posteriorly by the calcaneum and astragalus ; anteriorly, 

 by the scaphoid and cuboid. (Fig. 316.) The ligaments are : (i) The external 

 calcaneo-scaphoid ; (2) the inferior calcaneo-scaphoid ; (3) the astragalo-scaphoid 

 ligament ; (4) the internal or interosseous calcaneo-cuboid ligament ; (5) the long 

 inferior calcaneo-cuboid ligament ; (6) the short inferior calcaneo-cuboid liga- 

 ment ; (7) the dorsal calcaneo-cuboid ligament. 



Give the attachments of the long inferior calcaneo-cuboid ligament and the 

 common name for the same. (Fig. 319.) 



It is also called the long plantar ligament. It is attached to the whole infe- 

 rior surface of the calcaneum behind ; to the cuboid and bases of the meta- 

 tarsal s in front. 



Can you mention any other important fact in regard to the long plantar 

 ligament ? 



Yes ; it completes the canal for the peroneus longus muscle, and also gives 

 origin to the adductor hallucis and the flexor brevis minimi digiti. (Fig. 319.) 



Give the attachments of the short inferior calcaneo-cuboid ligament and its 

 common name. 



It is called the short plantar ligament. It is attached to the under surfaces 

 of the calcaneum and cuboid. (Fig. 319.) 



From what source does the medio-tarsal joint receive its nerve-supply ? 



From the outer division of the anterior tibial, the musculo-cutaneous, and ' 

 the external plantar nerves. 



From wliat source does the mcdio-tarsal joint receive its blood-supply .' 



From the anterior tibial, the dorsalis pedis, and the internal and external 

 plantar arteries. 



What class and subdivision does the medio-tarsal articulation belong in / 



(i) The astragalo-scaphoid joint is diarthrosis by class, and enarthrodia by 

 subdivision ; (2) the calcaneo-cuboid is diarthrosis by class, and saddle arthrodia 

 by subdivision. 



Name the ligaments of the calcaneo-astragaloid articulation. 



(i) The external calcaneo-astragaloid ligament; (2) the internal calcaneo- 

 astragaloid ligament ; (3) the posterior calcaneo-astragaloid ligament ; (4) the 

 interosseous calcaneo-astragaloid ligament. 



Locate- the interosseous ligament . 



It extends from the calcaneum to the astragalus, connecting the parallel 

 oblique grooves of these two bones. 



Describe the scapho-cuneiform articulation. 



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



Subdivision. Arthrodia, because of a gliding movement. 



Ligaments. Dorsal, plantar, and internal. 



