110 THE VOYAGE OF H.M.S. CHALLENGER. 



Sehneidermuskel, Wiedemann, p. 94. 



Couturier, Meckel, vol. vi. p. 98, Xo. 8. 



Couturier, Cuvier, vol. i. p. 371. 



Sartorius, Owen, p. 36. 



Rectus femoris, Eeid, p. 143. 



Sartorius, Selenka, vol. vi. p. 142, No. 82. 



G<mturier, Gervais and Alix, p. 30. 



Attachments. — The sartorius is a very powerful muscle. It arises from the spines of 

 the sixth, seventh, and eighth dorsal vertebrae, and by means of a distinct bundle of 

 muscular fibres from the anterior border and outer surface of the iliac bone. The fibres 

 pass obliquely forwards, and are inserted into the inner surface and anterior border of 

 the patella, as also to a slight extent into the internal of the two anterior tibial crests. 



Action. — It flexes the hip and extends the knee joint. 



Relations. — The muscle is superficial, except at its origin, where it is in part concealed 

 by the dorsal cutaneous muscle. Its posterior border lies parallel to, and almost in con- 

 tact with the tensor fascise femoris. Its insertion conceals the tendon of the " ambiens," 

 where the latter lies in the j)atellar groove. 



Nerve supply. — A branch of the anterior crural nerve, which enters the posterior 

 border of the muscle. 



Variations. — The origin of the sartorius varies somewhat in different species. In 

 Sjjheniscus deviersus its iliac origin is extremely slight, whilst its attachment to the 

 spine extends as far forwards as the spinous process of the fifth dorsal vertebra. In 

 other species, again, e.g., Spheniscus magellanicus, and especially in Eudyptes chrysolophus, 

 the iliac origin is the more extensive, while that from the sj)ine is correspondingly re- 

 duced in size. In the latter species, as well as in Aptenodytes, and in Eudyptes chryso- 

 come from the Falklands, the sartorius is inserted exclusively into the patella. 



2. Rectus femoris. 



Le muscle du fascia lata, Yicq d'Azyr, 1774, p. 494, No. 2. 

 Der breite Scheukelmuskel (anterior part of), Wiedemann, p. 94. 

 Der breite Schenkelmuskel (anterior part of), Tiedemann, p. 331, No. 2. 

 Tenseur de Vaponivrose crurale, ]\Ieckel, vol. vL p. 89, No. 1. 

 Tensor vagince et rectus femoris (anterior part of), Owen, p. 35. 

 Tensor vagince femoris (anterior part of), Reid, p. 143. 

 JReetus femoris, Selenka, voL vi. p. 142, No. 83. 

 Tenseur du fascia lata, Gervais and Alix, p. 30. 



Attachments. — The rectus femoris is represented by that portion of the broad 



musculo-aponeurotic sheet covering the outer side of the thigh, which lies in front of the 



■ cotyloid cavity. It arises by means of a fascial tendon from the coalesced spinous 



processes of the lumbo-sacral portion of the vertebral column, and extends from the 



