出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/10/06 07:04:31」(JST)
| Biceps Femoris | |
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Posterior view of right leg. Long head of muscle highlighted in red, short head labeled in the lower part of the image
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| Details | |
| Origin | tuberosity of the ischium, linea aspera, femur |
| Insertion | the head of the fibula which articulates with the back of the lateral tibial condyle |
| Artery | deep femoral artery, perforating arteries |
| Nerve | long head: tibial nerve short head: common fibular nerve |
| Actions | flexes knee joint, laterally rotates knee joint (when knee is flexed), extends hip joint (long head only) |
| Antagonist | Quadriceps muscle |
| Identifiers | |
| Latin | musculus biceps femoris |
| TA | A04.7.02.032 |
| FMA | 22356 |
| Anatomical terms of muscle
[edit on Wikidata]
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The biceps femoris (/ˈbaɪsɛps ˈfɛmərᵻs/) is a muscle of the thigh located to the posterior, or back. As its name implies, it has two parts, one of which (the long head) forms part of the hamstrings muscle group.
It has two heads of origin;
The fibers of the long head form a fusiform belly, which passes obliquely downward and lateralward across the sciatic nerve to end in an aponeurosis which covers the posterior surface of the muscle, and receives the fibers of the short head; this aponeurosis becomes gradually contracted into a tendon, which is inserted into the lateral side of the head of the fibula, and by a small slip into the lateral condyle of the tibia.[1]
At its insertion the tendon divides into two portions, which embrace the fibular collateral ligament of the knee-joint.[1]
From the posterior border of the tendon a thin expansion is given off to the fascia of the leg. The tendon of insertion of this muscle forms the lateral hamstring; the common fibular (peroneal) nerve descends along its medial border.[1]
The short head may be absent; additional heads may arise from the ischial tuberosity, the linea aspera, the medial supracondylar ridge of the femur, or from various other parts.[1] The tendon of insertion may be attached to the Iliotibial band and to retinacular fibers of the lateral joint capsule.[2]
A slip may pass to the gastrocnemius.[1]
It is a composite muscle as the short head of the biceps femoris develops in the flexor compartment of the thigh and is thus innervated by common fibular branch of the sciatic nerve (L5, S2), while the long head is innervated by the tibial branch of the sciatic nerve (L5, S2).[3]
The muscle's vascular supply is derived from the anastomoses of several arteries: the perforating branches of the profunda femoris artery, the inferior gluteal artery, and the popliteal artery.[3]
Both heads of the biceps femoris perform knee flexion.[4]
Since the long head originates in the pelvis it is also involved in hip extension.[4] The long head of the biceps femoris is a weaker knee flexor when the hip is extended (because of active insufficiency). For the same reason the long head is a weaker hip extender when the knee is flexed.
When the knee is semi-flexed, the biceps femoris in consequence of its oblique direction rotates the leg slightly outward.
| This section needs expansion. You can help by adding to it. (November 2013) |
Avulsion of the biceps femoris tendon is common in sports that require explosive bending of the knee as seen in sprinting.
Right hip bone. External surface.
Bones of the right leg. Anterior surface.
Cross-section through the middle of the thigh.
Muscles of the gluteal and posterior femoral regions.
The popliteal, posterior tibial, and peroneal arteries.
Nerves of the right lower extremity Posterior view.
Back of left lower extremity.
Biceps femoris
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
Muscles of the hip and human leg
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| リンク元 | 「大腿二頭筋」 |
| 拡張検索 | 「biceps femoris muscle」「musculus biceps femoris」 |
| 関連記事 | 「femor」「femoris」 |
大腿の屈筋＞:大腿の屈筋
大腿部の