332 FASCLE AND MUSCLES OF THE HORSE 
proximal part of the medial patellar ligament. (2) The tendon of the rectus 
femoris. 
Action.—To extend the stifle joint. 
Structure-—This is very similar to that of the vastus lateralis. It is, how- 
ever, more difficult to separate from the intermedius, because many fibers of the 
latter arise on the tendinous sheet which covers the contact surface of the medial 
Shaft of ilium 
Gluteus profundus 
Trochanter major — 
(antervor part) 
\ : 
\. Prepubic tendon 
Obturator externus 
Vastus lateralis 
Vastus intermedius 
Rectus fe moris —— Vastus medialis 
Vastus lateralis 
Biceps femoris — Adductor 
Patella 
. Medial femoro-tibial ligament 
Lateral femoro-tibial 
egament — Medial meniscus 
¢ é 
Lateral patellar ligament 
ae : Middle patellar ligament 
Tuberosity of tibia 
Fic. 291.—Musctes or Ricut TuicH oF Horse; Deep Dissection. 
The preparation is viewed from the front and somewhat medially. Most of rectus femoris and vastus lateralis 
has been removed. 1, Stump of origin of rectus femoris; 2, capsularis; 3, accessory ligament; 4, cotyloid hgament; 
5, head of femur; 6, trochlea of femur. 
vastus. Its insertion into the patella is chiefly by means of a broad, strong tendon. 
From the deep face fleshy fibers are inserted also into the femoro-patellar joint cap- 
sule. 
Relations.—Medially, the skin and fascia, the iliacus, sartorius, pectineus, and 
adductor, the femoral vessels, and saphenous nerve; laterally, the femur, femoro- 
patellar joint capsule, rectus femoris, and vastus intermedius, the anterior femoral 
artery, and branches of the femoral nerve. 
