REPORT ON THE SPHENISCID^. 115 



7. Gracilis. 



Der innere gerade Sehenkelmuskel, Wiedemann, p. 98. 



Der innere gerade Sche7ikehnuskel, Tiedemann, p. 333, No. 5. 



"A muscle from the interior and a small part of the antei-ior and posterioi~ surfaces of the thigh 



bone," Eeid, p. 144. 

 Gracilis (part of), Owen, p. 37. 

 Muscle No. 6, Meckel, voL vi. p. 96, No. 6. 

 Gracilis (?), Selenka, voL vi. p. 143, No. 85. 

 Crural interne, Gervais and Alix, p. 31. 



Attachments. — This is a slender muscle. It arises from the whole length of the inner 

 surface of the shaft of the femur, reaching as high as the insertion of the gluteus 

 minimus. The muscle terminates on a tendon immediately above the knee joint, and is 

 inserted into the upper end of the internal anterior tibial crest, as well as into the inferior 

 internal angle of the patella. 



Action. — It extends the knee joint. 



Relations. — The muscle rests upon the femur, lying between the origin of the extensor 

 cruris on its outer, and the insertion of the adductor magnus on its inner side. It is con- 

 cealed superficially by the ambiens muscle. 



Nerve supply. — A branch from the anterior crural nerve. 



Remarks. — At the date of writing the above, Selenka's description of the muscles is 

 still incomplete. So far, his description of the gracilis corresponds closely with my 

 own, but it is possible that when his description of the muscles of the leg is completed, it 

 may appear that my gracilis is synonymous with the vastus internus of Selenka. 



8. Extensor cruris. 



Muscle crurcde, Yicq d'Azyr, 1774, p. 506, No. 1. 



Der eigentliche Sehenkelmuskel, Wiedemann, p. 95. 



Der innere grosse Muslcel, Merrem. 



Der Schenkel-Muskel mit dem dussern und innen-n dicken Schenkel-Muskel, Tiedemann, p. 



332, No. 4. 

 Cruneus and vastus internus, Owen, p. 37. 

 Extenseur de lajamhe, Meckel, vol. vi. p. 97, No. 7. 

 Cruralis, Reid, p. 144. 



Crurceus et vastus ezternus, Selenka, vol. vi. p. 144, No. 89. 

 Crurale moyen et exteme, Gervais and Alix, p. 31. 



Attachments. — The extensor cruris consists of a single large fleshy mass, which is 

 not divisible into separate muscles without artificial dissection. It arises from the whole 

 of the outer and anterior surfaces of the shaft of the femur, and to a less extent from the 

 inner surface of that bone, extending upwards as high as the insertion of the gluteus 



