THE MEDIAL MUSCLES OF THE THIGH 327 
Insertion.—(1) The posterior surface of the femur from the level of the third 
trochanter to the groove for the femoral vessels; (2) the medial epicondyle of the 
femur and the medial ligament of the stifle joint. 
Action.—To adduct the limb and extend the hip joint. It also rotates the fe- 
mur inward. 
Structure. 
It is almost entirely fleshy, and is composed of parallel bundles 
Psoas minor 
Sartorius (origin) 
Iliopsoas — 
Tensor fascie late 
Rectus femoris 
_—— Semimembranosus 
- Adductor 
Vastus medialis - 
Patella 
Middle patellar ligament SS. 
Medial patellar ligament —SH» 
; : Semitendinosus 
| Tendon of sartorius (cut) 
Tendon of gracilis (cut) ; 
a Medial head of gastroc- 
nemius 
aaa ; ; : ; Tibial nerve 
Tibial insertion of semitendinosus 
Fic. 288.—Muscties or Petvis anp TuicH oF Horss, Ricut Sime; Mepriar View. 
Figure represents deeper dissection of specimen shown in preceding figure. 
1, Tendon of insertion of psoas minor; 2, lumbo-sacral plexus; 3, 3’, heads of obturator internus; 4, sacro-coccy- 
geus ventralis; 5, cocecygeus; 6, retractor ani (origin); 7, sacro-sciatic ligament; 8, lesser sciatic foramen; 9, femoral 
nerve; 10, femoral vessels; 11, 11, pectineus; 12, accessory ligament; 13, external pudic vein; 14, pubis; 15, femoro- 
patellar joint capsule; 16, distal end of femur; 17, medial meniscus; 18, medial ligament of stifle joint; 19, medial 
femoro-patellar ligament. 
united rather loosely. It is usually possible to separate from the principal mass a 
| small anterior short part,! which is inserted into the femur behind the pectineus. 
| The principal mass? is perforated just below the insertion of the pectineus by an 
| opening for the femoral vessels (hiatus adductorius), and is thus divided into two 
1 This has been termed by various authors the adductor parvus or brevis. 
* Termed by various authors the adductor magnus or longus. 
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