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The vastus lateralis (/ ˈ v æ s t ə s ˌ l æ t ə ˈ r eɪ l ɪ s, ˈ r æ-/), also called the vastus externus, [1] is the largest and most powerful part of the quadriceps femoris, a muscle in the thigh. Together with other muscles of the quadriceps group, it serves to extend the knee joint, moving the lower leg forward.
Treatment typically involves rest and rehabilitation with a physical therapist. [6] Runners may need to switch to activities such as cycling or swimming. [3] Insoles may help some people. [3] Symptoms may last for years despite treatment. [3] Patellofemoral pain syndrome is the most common cause of knee pain, affecting more than 20% of young ...
The top of the patella attaches to the quadriceps muscle via the quadriceps tendon, [2] the middle to the vastus medialis obliquus and vastus lateralis muscles, and the bottom to the head of the tibia (tibial tuberosity) via the patellar tendon, which is a continuation of the quadriceps femoris tendon. [13]
The vastus lateralis is the largest and most powerful of the three vasti muscles. It arises from the several areas of the femur, including the upper part of the intertrochanteric line; the lower, anterior borders of the greater trochanter, to the outer border of the gluteal tuberosity, and the upper half of the outer border of the linea aspera.
The anterior compartment is one of the fascial compartments of the thigh that contains groups of muscles together with their nerves and blood supply. The anterior compartment contains the sartorius muscle (the longest muscle in the body) and the quadriceps femoris group, which consists of the rectus femoris muscle and the three vasti muscles – the vastus lateralis, vastus intermedius, and ...
Common injection sites include the deltoid, vastus lateralis, and ventrogluteal muscles. [9] Medical professionals are trained to give IM injections, but people who are not medical professionals can also be trained to administer medications like epinephrine using an autoinjector in an emergency. [ 10 ]
The vastus lateralis site is used for infants less than 7 months old and people who are unable to walk or who have loss of muscular tone. [12] The site is located by dividing the front thigh into thirds vertically and horizontally to form nine squares; the injection is administered in the outer middle square. [15]
Green is the medial compartment (gracilis and adductor magnus), blue is the posterior (semimembrosus to biceps c. brevis) and red is the anterior (vastus lateralis to sartorius). The fascial compartments of thigh are the three fascial compartments that divide and contain the thigh muscles .