THIGH AND BUTTOCK. 



spine of ilium; (reflected head) rough groove on dorsum of 

 ilium just above highest part of acetabulum. A bursa lies 

 under the latter. Course; the heads, bound together and to 

 the hip-joint capsule by a process from the ilio-tibial band, give 

 origin to a single anterior tendon. From this and a medial sep- 

 tum the fibres arise in a bipenniform manner, and end in a broad 

 posterior tendon which narrows below; under this is a bursa 

 which communicates with the knee-joint. Insertion; upper 

 border of patella. [359] 



Vastus Extemus. Origin; shaft of femur (anterior tubercle, 

 lower border of great trochanter, gluteal ridge, and upper half 

 of linea aspera) ; fascia lata and external intermuscular sep- 

 tum. Insertion; outer border of tendon of Rectus femoris; 

 upper and outer border of patella; capsule of knee-joint and 

 external lateral ligament of patella. [361] 



Vastus Internus. Origin; shaft of femur (anterior tubercle, 

 spiral line, linea aspera, and upper two-thirds of internal epi- 

 condylic line) ; f ascial roof of Hunter's canal ; internal inter- 

 muscular septum and tendon of Adductor magnus. Insertion ; 

 inner border of Rectus tendon; upper and inner border of 

 patella; capsule of knee-joint and internal lateral ligament of 

 patella. [361] 



Crureus. Origin; upper two-thirds of anterior and external 

 surfaces of shaft of femur; lower half of linea aspera, and up- 

 per part of external epicondylic line ; corresponding portion of 

 external intermuscular septum. Insertion; deep surface of 

 Rectus and Vasti tendons through fibres which join a mem- 

 branous expansion on its surface. This muscle is inseparable 

 from the Vastus internus below the lower third. [361] 



Subcrureus (several separate muscle bundles). Origin; 

 lower fourth of front of femur. Insertion; synovial membrane 

 of knee-joint, under Rectus tendon. [362] 



Ilio-psoas. This is composed of the Iliacus and Psoas mag- 

 nus. [362] 



Psoas Magnus. Origin; intervertebral discs above each 

 18 [ 273 ] 



