Muscles of the hip 3779092 213396661 2008-05-19T03:41:35Z Icewedge 2469121 Reverted edits by [[Special:Contributions/68.94.20.146|68.94.20.146]] ([[User talk:68.94.20.146|talk]]) to last version by Bobo192 [[Image:Posterior Hip Muscles 1.PNG|right|thumb|200px|Posterior view of several hip muscles]] [[Image:Anterior Hip Muscles 2.PNG|right|thumb|200px|Anterior view of several hip muscles]] [[Image:Posterior Hip Muscles 3.PNG|right|thumb|200px|Posterior view of Gluteus maximus and Gluteus medius]] In [[human anatomy]], the '''muscles of the hip joint''' are those [[muscle]]s that cause movement in the [[hip (anatomy)|hip]]. Most modern anatomists define 17 of these muscles, although some additional muscles may sometimes be considered. These are often divided into four groups according to their orientation around the hip joint: the [[gluteal muscles|gluteal group]], the [[lateral rotator group]], the [[adductor muscles of the hip|adductor group]], and the [[iliopsoas group]]. ==Gluteal group== The gluteal muscles include the [[gluteus maximus]], [[gluteus medius]], [[gluteus minimus]], and [[tensor fasciae latae]]. They cover the lateral surface of the [[ilium (bone)|ilium]]. The gluteus maximus, which forms most of the muscle of the [[buttock]], originates primarily on the ilium and [[sacrum]] and inserts on the [[gluteal tuberosity]] of the [[femur]] as well as the [[iliotibial tract]], a tract of strong [[fibrous tissue]] that runs along the lateral [[thigh]] to the [[tibia]] and [[fibula]]. The gluteus medius and gluteus minimus originate anterior to the gluteus maximus on the ilium and both insert on the [[greater trochanter]] of the femur. The tensor fasciae latae shares its insertion with the gluteus maximus at the ilium and also shares the insertion at the iliotibial tract. ==Adductor group== The [[adductor brevis]], [[adductor longus]], [[adductor magnus]], [[pectineus]], and [[gracilis]] make up the adductor group. The adductors all originate on the [[pubis (bone)|pubis]] and insert on the medial, posterior surface of the femur, with the exception of the gracilis which inserts just below the [[medial condyle]] of the tibia. ==Iliopsoas group== The [[iliacus]] and [[psoas major]] comprise the iliopsoas group. The iliopsoas is a large muscle that runs from the [[transverse process]]es of the T-12 to L-5 [[vertebra]]e, joins with the iliacus via its [[tendon]], and connects to the [[lesser trochanter]] of the femur. The iliacus originates on the [[iliac fossa]] of the ilium. Together these muscles are commonly referred to as the "iliopsoas". ==Lateral rotator group== This group consists of the [[externus obturator|externus]] and [[internus obturator]]s, the [[piriformis]], the [[superior gemellus|superior]] and [[inferior gemellus|inferior gemelli]], and the [[quadratus femoris]]. These six originate at or below the [[acetabulum]] of the ilium and insert on or near the greater trochanter of the femur. ==Movement of the hip joint== [[Flexion]] of the hip occurs when the angle between the [[torso]] and [[thigh]] is decreased. When this angle is increased beyond normal standing posture, the movement is called hip [[extension]]. Hip rotation occurs when the femur moves along its longitudinal axis. When the anterior surface of the femur turns outward, this is [[lateral rotation]] of the hip. The movement of the anterior surface of the femur inward is [[medial rotation]] of the hip. Medial rotation of the hip is carried out by [[gluteus medius]] and [[gluteus minimus]]. Hip [[anatomical terms of motion|abduction]] occurs when the femur moves outward to the side, as in taking the thighs apart. Hip [[adduction]] occurs when the femur moves back to the midline. Many of the hip muscles are responsible for more than one type of movement in the hip, as different areas of the muscle act on tendons in different ways. The psoas is the primary hip flexor, assisted by the iliacus. The pectineus, the adductors longus, brevis, and magnus, as well as the tensor fasciae latae are also involved in flexion. The gluteus maximus is the main hip extensor, but the inferior portion of the adductor magnus also plays a role. The adductor group is responsible for hip adduction. Abduction primarily occurs via the gluteus medius as well as the gluteus minimus. Medial rotation is performed by the glutaei medius and minimus, as well as the tensor fasciae latae and assisted by the adductors brevis and longus and the superior portion of the adductor magnus. Each muscle of the lateral rotator group causes lateral rotation of the thigh. These muscles are aided by the gluteus maximus and the inferior portion of the adductor magnus. ==Other hip muscles== Additional muscles, such as the [[rectus femoris]] and the [[sartorius muscle|sartorius]], can cause some movement in the hip joint. However these muscles are primarily concerned with the movement of the [[knee]], and are therefore not generally classified as muscles of the hip. ==Sources== * Calais-Germain, Blandine. "Anatomy of Movement", Eastland Press, 1993. ISBN 0-939616-17-3 * Martini, Frederic; Timmons, Michael; McKinnley, Michael. "Human Anatomy", 3rd Edition, Prentice-Hall, 2000. ISBN 0-13-010011-0 * Marieb, Elaine. "Essentials of Human Anatomy and Physiology", 6th Edition. Addison Wesley Longman, 2000. ISBN 0-8053-4940-5 *Netter, Frank H. "Atlas of Human Anatomy", 2nd Edition, Icon Learning Systems, 2001. ISBN 0-914168-81-9 [[Category:Muscular system]]