408 



THE MUSCULAK SYSTEM. 



(insertion) 

 Ligamentum patellae 

 rtion) 



greater trochanter, (4) the distal border of the greater trochanter, (5) the lateral 

 margin of the gluteal tuberosity of the femur and the tendon of the glutseus 

 maximus, (6) the proximal half of the linea aspera, and (7) the fascia lata and 

 lateral intermuscular septum (Fig. 360, p. 406). 



It forms a thick, broad muscle directed distally and forwards, and is inserted 

 by a broad membranous tendon into (1) the lateral border of the tendon of the 

 rectus femoris, (2) the proximal and lateral border of the patella, and (3) the 

 capsule of the knee-joint and the fibular collateral ligament of the patella. 

 A bursa intervenes between it and the membranous insertion of the glutaeus 

 maximus. 



M. Vastus Medialis. The vastus medialis is larger than the vastus lateralis 

 and has a more extensive origin, from (1) the distal two- thirds or more of the spiral 



line, the linea aspera, and the proximal 

 two -thirds of the line leading from 

 the linea aspera to the medial condyle 

 of the femur ; (2) the membranous ex- 

 pansion of the fascia lata which lies 

 beneath the sartorius and forms the 

 roof of the adductor canal ; and (3) the 



Semi-membranosus , . , . , 



medial intermuscular septum and the 

 tendon of the adductor magnus (Figs. 

 359, p. 404, and 365, p. 410). 



popiiteus (insertion) From its origin the muscle is 



Attachment of tibiai coi- directed dis tally and laterally towards 



lateral ligament of the knee the knee . ifc ig inserted by a gtrong 



Graciiis (insertion) aponeurotic tendon into (1) the medial 



border of the rectus tendon; (2) into 

 the proximal and medial border of 



semi-tendinosus (insertion) the patella; and (3) the capsule of 

 the knee-joint and the collateral liga- 

 ment of the patella. The muscle con- 

 ceals the medial side of the body of 

 the femur and the vastus intermedius, 

 with which it is closely incorporated in 

 its distal two-thirds. 



M. Vastus Intermedius. -- The 

 vastus intermedius muscle (O.T. 

 crureus) arises by fleshy fibres from 



(1) the proximal two-thirds of the body 

 of the femur on the anterior and lateral 



FIG. 363. MUSCLE- ATTACHMENTS TO THE MEDIAL SIDE surfaces but not the medial surface ' 



OF THE PROXIMAL PART OF THE RIGHT TlBIA. x O x ,-, -j , i v lr f ,v i , 



(2) the distal half of the lateral lip 



of the linea aspera and the proximal part of the line leading therefrom to the 

 lateral condyle; and (3) a corresponding portion of the lateral intermuscular 

 septum (Fig. 359, p. 404). 



For the most part deeply placed, the muscle is directed distally to an 

 insertion into the deep surface of the tendons of the rectus and vasti muscles by 

 means of fibres which join a membranous expansion on its surface. It is 

 closely adherent to the vastus lateralis muscle in the middle third of the 

 thigh ; it is inseparable from the vastus medialis below the proximal third. 

 In the distal third of the thigh it conceals the articularis genu muscle, a bursa, 

 and the proximal prolongation of the synovial membrane of the knee-joint. 



M. Articularis Genu. The articularis genu (O.T. subcrureus) muscle consists 

 of a number of separate bundles of muscular fibres arising deep to the vastus 

 intermedius from the distal fourth of the anterior surface of the femur, and 

 inserted into the synovial membrane of the knee-joint. 



The four elements composing the quadriceps femoris muscle have been traced 

 in their convergence to the patella. Their ultimate insertion is into the tubercle 

 of the tibia (Fig. 363), by means of the ligamentmn patellae, and the vasti 



