Regarding the above video, current research doesn’t support adduction as an action of the gluteus maximus’ inferior fibers. The muscle’s role is more likely in controlling and stabilising the hip during adduction, rather than directly causing it. Some popular anatomy websites and textbooks may suggest otherwise, but the evidence supporting adduction is insufficient to make such a conclusion.
|Origin||Posterior gluteal line of the ilium|
Posterior surface of the sacrum
Posterior surface of the coccyx
|Insertion||Gluteal tuberosity of the femur|
Iliotibial band (which inserts into the lateral condyle of the tibia)
Hip lateral rotation
Contributes weakly to hip abduction
|Nerve||Inferior gluteal nerve (L4, L5, S1, S2)|
|Artery||Superior and inferior gluteal arteries|
Location & Overview
The gluteus maximus is the largest and heaviest muscle in the human body. It forms the most superficial layer of the gluteal muscle group, which also includes the gluteus medius and gluteus minimus muscles. The gluteus maximus is located in the posterior part of the hip and buttock region and it covers the other two gluteal muscles, except for the anterior superior third of the gluteus medius  . Its primary function is hip extension, and it is involved in activities such as: walking, running, jumping, weightlifting and climbing stairs.
Exercises that target the gluteus maximus muscle are important for improving muscle strength, hypertrophy, and functionality. The barbell hip thrust, popularised by Bret Contreras, has been demonstrated to be one of the best exercises to develop the size and strength of the gluteus maximus, above even the barbell squat . Other exercises for strengthening the gluteus maximus include: Romanian deadlifts, step-ups, lunges, and barbell glute bridges   .
Origin & Insertion
The gluteus maximus muscle originates from several places on the pelvic bones and the lower back. The first origin point is on the posterior gluteal line of the ilium. The ilium is the largest bone of the pelvis located at the top of the hip. The posterior gluteal line is a bony ridge on the outer surface of the ilium. The gluteus maximus also originates from the posterior surface of the sacrum and the coccyx, which are two bones at the base of the spine  .
Furthermore, the gluteus maximus originates from the thoracolumbar fascia. The thoracolumbar fascia is a broad sheet of connective tissue that covers the lower back muscles. Another origin point is the sacrotuberous ligament, which is a strong band of fibrous tissue that connects the sacrum to the ischial tuberosity. The ischial tuberosity is a bony prominence located on the lower part of the pelvis  .
The muscle fibers of the gluteus maximus merge together to form a tendon that inserts onto two main locations. The insertions of the gluteus maximus are the gluteal tuberosity of the femur and the iliotibial tract (also known as the iliotibial band or IT band). The femur is the long bone of the thigh, and the gluteal tuberosity is a roughened area on its lateral surface, near the upper part of the bone. The iliotibial tract is a thick band of fibrous connective tissue that runs down the lateral aspect of the thigh, from the ilium to the tibia  .
The gluteus maximus muscle has actions involving the hip joint. Its primary function is hip extension, which is the movement of straightening out the hip joint from a flexed position. This action is useful for activities such as standing up from a seated position, walking up stairs, or running. In addition to hip extension, the gluteus maximus also assists with lateral rotation of the hip. Lateral (external) rotation is the rotation of the thigh outwards, relative to the hip joint. This movement is important for stabilising the hip during weight-bearing activities   .
Furthermore, the gluteus maximus is able to to weakly contribute to hip abduction  , which involves the movement of the leg away from the midline of the body. The upper fibers contribute more in frontal plane hip abduction, and all of the fibers contribute in the transverse plane.
Some online sources and even textbooks suggest that the inferior part of the gluteus maximus muscle contributes to hip adduction, there isn’t sufficient evidence to support this claim. It is more likely that the role which the gluteus maximus plays during adduction is controlling and stabilising the hip, rather than directly causing adduction. The glute max can abduct but(t) not adduct  .
The gluteus maximus muscle is innervated by the inferior gluteal nerve, which arises from the lumbar and sacral segments of the spinal cord, specifically L5, S1, and S2 nerve roots. These nerve roots exit the spinal cord and combine to form the sacral plexus. The sacral plexus is a network of nerves located within the pelvis  .
The inferior gluteal nerve leaves the sacral plexus through the greater sciatic foramen, a space between the pelvic bones that provides passage for various nerves and blood vessels. It then passes deep to the gluteus maximus muscle, supplying it with motor innervation. This allows the muscle to contract and perform its various functions, such as hip extension, lateral rotation, and potentially hip abduction  .
The gluteus maximus muscle receives its blood supply from two main sources: the superior gluteal artery and the inferior gluteal artery. Both of these arteries are branches of the internal iliac artery, which is a major blood vessel in the pelvic region .
The superior gluteal artery exits the pelvis through the greater sciatic foramen, which is just above the piriformis muscle. It then divides into superficial and deep branches, which supply the gluteus maximus and other nearby muscles, as well as the nearby skin and connective tissues .
The inferior gluteal artery, on the other hand, exits the pelvis through the greater sciatic foramen, below the piriformis muscle. It also gives off branches that supply the gluteus maximus muscle and neighboring structures. Both the superior and inferior gluteal arteries provide oxygenated blood and nutrients to the gluteus maximus muscle .
Want some flashcards to help you remember this information? Then click the link below:
Gluteus Maximus Muscle Flashcards
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