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Quadriceps muscle : ウィキペディア英語版
Quadriceps femoris muscle

The quadriceps femoris () (Latin for "four-headed muscle of the femur"), also called simply the quadriceps, quadriceps extensor, or quads, is a large muscle group that includes the four prevailing muscles on the front of the thigh. It is the great extensor muscle of the knee, forming a large fleshy mass which covers the front and sides of the femur.
==Structure==

It is subdivided into four separate portions or 'heads', which have received distinctive names:
*Rectus femoris occupies the middle of the thigh, covering most of the other three quadriceps muscles. It originates on the ilium. It is named from its straight course.
*The other three lie deep to rectus femoris and originate from the body of the femur, which they cover from the trochanters to the condyles:
*
*Vastus lateralis is on the ''lateral side'' of the femur (i.e. on the outer side of the thigh).
*
*Vastus medialis is on the ''medial side'' of the femur (i.e. on the inner part thigh).
*
*Vastus intermedius lies between vastus lateralis and vastus medialis on the ''front'' of the femur (i.e. on the top or front of the thigh), but deep to the rectus femoris. Typically, it cannot be seen without dissection of the rectus femoris.
All four parts of the quadriceps muscle ultimately insert into the tibial tuberosity of the tibia. This is via the patella, where the quadriceps tendon becomes the patellar ligament, which then attaches to the tibia.
There is a fifth muscle of the quadriceps complex that is often forgotten and rarely taught called articularis genus.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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