MUSCLES OF THE PELVIC LIMB 379 
ligament, passes downward between the biceps and semimembranosus, and ends by 
blending with the former. 
The semitendinosus arises from the tuber ischii only. It ends on the crest and 
medial surface of the tibia. 
The semimembranosus is large and arises from the ischium only. It divides 
into two parts: the anterior part ends on the tendon of the pectineus, on the femur 
above the medial condyle, and on the medial sesamoid bone; the posterior part 
Fic. 326.—Muscies oF Petvic Lass or Doc; Meprar View. 
a, Ilio-psoas; 6b, tendon of psoas minor; c, sacro-coccy- 
geus ventralis lateralis; d, coccygeus; e, piriformis; f, obtur- 
ator internus; g, origin of retractor ani; h, hk’, sartorius; 7, rec- 
tus femo k, vastus medialis; 1, pectineus; m, adductor; 
n, gracilis; 0, semitendinosus; p, semimembranosus; g, gas- 
trocnemius, medial head; q’, tendon of gastrocnemius; r, 
superficial digital flexor; r’, tendon of r; s, tarsal tendon 
of biceps femoris; ¢, popliteus; u, flexor hallucis longus; wu’, 
long digital flexor; u’’, common tendon of u and u’; 0, tendon 
of tibialis posterior; w, tibialis anterior; z, tendon of long 
digital extensor; 1, pelvic surface of ilium; 2, section of sym- 
physis pelvis; 3, tuber ischii; 4, medial condyle of femur; 
6, ligamentum patelle#; 6, 7, medial surface of tibia; 8, tarsus; 
8’, fibular tarsal bone; 9, metatarsus. (Ellenberger-Baum, 
Anat. d. Hundes.) 
ends on the medial condyle of the tibia, the tendon passing under the medial liga- 
ment of the stifle joint. 
It is not possible clearly to separate the quadriceps femoris into four heads. 
The vastus lateralis is so much larger than the vastus medialis as to indicate that 
the vastus intermedius is incorporated with the former. The rectus femoris has 
only one tendon of origin. There is a bursa under the muscle at the distal third 
of the femur. The single patellar ligament acts as the tendon of insertion of the 
quadriceps. 
