. Chordate morphology. Morphology (Animals); Chordata. psoas minor psoas major artery and vein iliacus pectineus adductor longus et brevis gracilis. adductor magnus and semimembranosus semimembranosus gastrocnemius popliteus gracilis Figure M-9. Ventral (inner) musculature of the hip of the cot. A, hip in medial view with body wall opened to expose the iliacus and psoas muscles; B, deeper layer. be made up of a psoas major arising from the under side of the vertebral muscles. Medial to the major is the psoas minor tapering posteriorly to a long tendon which inserts on the ilium, below the head
. Chordate morphology. Morphology (Animals); Chordata. psoas minor psoas major artery and vein iliacus pectineus adductor longus et brevis gracilis. adductor magnus and semimembranosus semimembranosus gastrocnemius popliteus gracilis Figure M-9. Ventral (inner) musculature of the hip of the cot. A, hip in medial view with body wall opened to expose the iliacus and psoas muscles; B, deeper layer. be made up of a psoas major arising from the under side of the vertebral muscles. Medial to the major is the psoas minor tapering posteriorly to a long tendon which inserts on the ilium, below the head of the femur. From the mar- gin of the pelvis behind and above the insertion of the minor, another muscle, the iliacus arises. Its belly extends posteriorly and laterally, wrapped partly around the psoas major, to insert in common with the psoas major. Section of the bellies of the pectineus and adductor longus reveals the obturator externus. This muscle arises around the mar- gins of the obturator fenestra; its belly tapers to a tendon which inserts on the femur, behind the neck, in common with the obturator internus. The intrinsic muscles of the thigh are the vastus lateralis, vastus medialis, and vastus intermedius. These arise from the surface of the femur and insert on the knee region with the extrinsic muscles. The shank musculature is separable into an anterior (dorsal) division and a posterior (ventral) division (Figure 14-10). The superficial layer of the posterior muscles in- cludes the two heads of the gastrocnemius, lateral and medial, and the distally separated plantaris. Below this outer layer is a spindle-shaped muscle, the soleus, which inserts with the outer muscles. Medial to the proximal end of the soleus is the popliteus, which inserts along the bula. Below the soleus and lateral to the popliteus are the flexor hallucis, and flexor digitorum longus, in that order. The anterior muscles are the outer (and medial) tibialis anterior and below this the extensor
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