Search results
Results from the WOW.Com Content Network
The lesser trochanter is a conical posteromedial projection of the shaft of the femur, projecting from the posteroinferior aspect of its junction with the femoral neck. [1] The summit and anterior surface of the lesser trochanter are rough, whereas its posterior surface is smooth. [1] From its apex three well-marked borders extend: [2]
In addition, attachment to the lesser trochanter, located on the posteromedial aspect of the femur, causes lateral rotation and weak adduction of the hip. It forms part of a group of muscles called the hip flexors , whose action is primarily to lift the upper leg towards the body when the body is fixed or to pull the body towards the leg when ...
The two muscles are separate in the abdomen, but usually merge in the thigh. They are usually given the common name iliopsoas. The iliopsoas muscle joins to the femur at the lesser trochanter. It acts as the strongest flexor of the hip. The iliopsoas muscle is supplied by the lumbar spinal nerves L1–L3 (psoas) and parts of the femoral nerve ...
While the exact origin of the anatomical term "trochanter" is uncertain, multiple possible connections could be suggested. One possibility is that the term was derived directly from the Greek roots without influence from the maritime meaning, with the name referencing the trochanter’s role in enabling swift movement through muscle attachment.
In the remaining cases, it is either inserted into the upper part of the pectineal line or the posterior part of the lesser trochanter. While similar to its neighbouring adductors, it is formed by separation from the superficial layer of the obturator externus, and is thus not ontogenetically related to the adductors. [5]
In open-chain exercises, as part of the iliopsoas, the iliacus is important for lifting (flexing) the femur forward (e.g. front scale).In closed-chain exercises, the iliopsoas bends the trunk forward and can lift the trunk from a lying posture (e.g. sit-ups, back scale) because the psoas major crosses several vertebral joints and the sacroiliac joint.
The quadratus femoris is a flat, quadrilateral skeletal muscle. Located on the posterior side of the hip joint, it is a strong external rotator and adductor of the thigh, [2] but also acts to stabilize the femoral head in the acetabulum. The quadratus femoris is used in Meyer's muscle pedicle grafting to prevent avascular necrosis of femur head.
In archosaurs and especially in dinosaurs, the intertrochanteric fossa is highly developed as both the internal/lesser trochanter and the greater trochanter are better developed. In dinosaurs, this area serves as the insertion point of the iliofemoralis muscles (analogous to the gluteus muscles in mammals). [3]