Dominic Stone
The gluteal region is comprised of several muscles, including the gluteus maximus, gluteus medius, gluteus minimus, piriformis, and quadratus femoris. The gluteus maximus is the largest and strongest muscle of the gluteal region, involved in hip movements and stabilization. The gluteus medius and minimus are important abductors of the hip, and their dysfunction can lead to difficulties in walking. The deep gluteal muscles, such as the piriformis and quadratus femoris, contribute to external rotation and hip abduction. Highlighting the specific gluteal muscle in focus allows for a detailed understanding of its anatomy, functions, and potential clinical implications, such as gluteal tendinopathy, a condition affecting the gluteal tendons and muscles.
| Characteristics | Values |
|---|---|
| Name of the highlighted muscle | Gluteus medius |
| Other highlighted muscles | Gluteus maximus, piriformis, quadratus femoris, tensor fasciae latae, semimembranosus, supraspinatus, teres major, levator scapulae, anconeus, serratus anterior |
| Muscle group | Gluteal muscles |
| Location | Posterior hip |
| Function | Abduction of the hip |
| Proximal attachments | Outer surface of ilium, between the posterior and anterior gluteal lines |
| Distal attachments | Lateral and superior surfaces of the greater trochanter of femur |
| Related conditions | Gluteal tendinopathy, Greater Trochanteric Pain Syndrome (GTPS) |
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What You'll Learn
- Gluteus maximus: the largest and strongest gluteal muscle
- Gluteus medius: a posterior hip muscle that forms the buttocks
- Piriformis: the most superior muscle of the deep gluteal group
- Tensor fascia latae: the most anterior of the superficial gluteal muscles
- Quadratus femoris: a deep gluteal muscle with a quadrilateral shape
Gluteus maximus: the largest and strongest gluteal muscle
The gluteus maximus is the largest and strongest muscle in the human body. It is the outermost muscle of the buttocks and is located at the posterior aspect of the hip joint. It is the most superficial of all the gluteal muscles, covering all of them except for the antero-superior third of the gluteus medius. The gluteus maximus is involved in several sports, from running to weightlifting, and is activated in powerful lower limb movements such as stepping onto a step, climbing, or running.
The gluteus maximus is a powerful extensor of the hip joint. It works with the semitendinosus and semimembranosus to extend the hip, assisting in external rotation, abduction (superior fibres), and adduction (inferior fibres). The muscle receives its blood supply from the inferior and superior gluteal arteries. It is also involved in stabilising the knee joint as it inserts into the iliotibial band, which crosses the knee joint.
The gluteus maximus is prone to inhibition and weakness, which can contribute to chronic pain, injury, and athletic underperformance. As such, understanding how to assess and treat gluteus maximus dysfunction is important in sports science and medicine for injury prevention, rehabilitation, and performance enhancement. Functional assessment can be useful in evaluating injuries to the gluteus maximus and surrounding muscles. For example, the 30-second chair-to-stand test helps assess strength, flexibility, pain, and endurance, which can aid in determining a person's rehabilitation progress.
The gluteus maximus has evolved in human evolution to allow us to maintain an upright erect posture. It is an important muscle for activities of daily living, athletic performance, and stability of certain joints in the body. The muscle is involved in controlling anterior pelvic rotation, and its contraction can be palpated during standing hip extension, a step-up, or while standing and raising the medial borders of the foot.
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Gluteus medius: a posterior hip muscle that forms the buttocks
The gluteal region is an anatomical area located posteriorly to the pelvic girdle, at the proximal end of the femur. The gluteus medius is a fan-shaped muscle located in the posterior hip, extending from the ilium to the proximal femur. It is one of the three gluteal muscles, along with gluteus maximus and gluteus minimus. The gluteus medius muscle acts on the hip joint, producing two movements. Its anterior part internally rotates the thigh, while the contraction of the whole muscle abducts the thigh.
The gluteus medius is a middle gluteal muscle, located deep to the gluteus maximus and superficial to the gluteus minimus. The gluteus maximus covers all of the gluteal muscles except for the anterosuperior third of the gluteus medius. The gluteus medius muscle has its upper attachment on the gluteal, or lateral surface of the ilium, situated between the posterior and anterior gluteal lines, as well as the gluteal aponeurosis. The muscle fibres of the gluteus medius take distinct courses based on their position. The fibres of the posterior portion pass forwards and downwards, while the fibres of the anterior portion pass backwards and downwards.
The gluteus medius also supports the pelvis during gait by producing hip rotation with assistance from the gluteus minimus and tensor fascia lata. It stabilizes the pelvis while standing or walking. A peripheral injury of the superior gluteal nerve may lead to a loss of motor function, causing the pelvis to drop to the healthy side when standing on one leg. This condition is known as Trendelenburg's sign.
The gluteus medius is the prime mover of abduction at the hip joint. It is extremely important for abducting the hip, and its dysfunction can lead to significant difficulty in walking (ataxia). The gluteus medius muscle is also the recommended site of injection in the gluteal region, as an injury to the sciatic nerve and superior gluteal nerve can be avoided.
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Piriformis: the most superior muscle of the deep gluteal group
Piriformis is the most superior muscle of the deep gluteal group. It is named after its pear shape and is a useful landmark as it divides the greater sciatic foramen into two regions: the supra- and infra-piriform regions. The piriformis muscle is also notable for lying on top of the sciatic nerve.
The deep gluteal muscles are responsible for the external rotation of the hip. They are covered by the gluteus maximus, the largest muscle of the gluteal region, which is involved in hip movement and stabilisation. The gluteus maximus is also responsible for the extension of the hip, as well as assisting in external rotation, abduction (superior fibres) and adduction (inferior fibres).
The gluteal tendons are a tough band of tissue that connects the deep buttock muscles (gluteus medius and minimus) to the hip bone at a site called the greater trochanter. The gluteal muscles and tendons are crucial for activities such as walking, running, climbing stairs, and getting out of a chair. They also play a role in stabilising the knee joint.
The piriformis is an important muscle to identify as it is a useful landmark and lies on top of the sciatic nerve. The deep gluteal muscles can be difficult to differentiate, and the piriformis can be used as a reference point to identify the other muscles in the region. The order of the deep gluteal muscles inferior to the piriformis can be remembered using the mnemonics "GOGO-Q" or "GO In, GO Out-Q".
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Tensor fascia latae: the most anterior of the superficial gluteal muscles
The tensor fasciae latae (TFL) is a small muscle located in the hip and the top and outside of the thigh. It is a hip abductor muscle that rotates the thigh inwards towards the midline of the body. The TFL is one of the many supporting muscles that guide the power of the running stride into the ground.
The TFL is innervated by the superior gluteal nerve, L5 and S1. The superior gluteal nerve arises from the sacral plexus and only has muscular innervation associated with it. There is no cutaneous innervation for sensation that stems from the superior gluteal nerve. The superior gluteal artery also supplies the TFL.
The TFL works in synergy with the gluteus medius and gluteus minimus muscles to abduct and medially rotate the femur. It also works with the gluteus maximus via the iliotibial (IT) band to abduct the hip. The TFL acts by assisting in knee flexion and lateral rotation through the attachment of the IT band to the tibia. The IT band, also called the 'band of Maissiat', was originally studied in 1843 and was perceived to be a ligament that connected the ilium with the knee.
The TFL is important for aiding in pelvis stability during standing and walking. It assists in keeping the balance of the pelvis while standing, walking, or running. The basic functional movement of the TFL is walking. The muscle is heavily utilized in horse riding, hurdling, and water skiing.
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Quadratus femoris: a deep gluteal muscle with a quadrilateral shape
The quadratus femoris is a short, flat, quadrilateral skeletal muscle located in the deep gluteal region. It is one of the smaller deep gluteal muscles and is covered by the gluteus maximus muscle. The quadratus femoris muscle is responsible for the lateral rotation of the thigh at the hip joint. It is a powerful rotator of the hip, working in synergy with other external rotators such as the gluteus maximus, piriformis, superior gemellus, and obturator internus muscles.
The quadratus femoris muscle originates from the upper part of the lateral border of the ischial tuberosity, below the lower rim of the acetabulum. It then runs laterally to insert onto the quadrate tubercle on the intertrochanteric crest of the femur. The muscle is innervated by the nerve to quadratus femoris, which arises from the spinal nerves L4 to S1 of the sacral plexus.
The blood supply to the quadratus femoris primarily comes from the inferior gluteal artery, a large branch of the internal iliac artery. Additionally, a smaller part of the muscle receives its blood supply from the descending branch of the medial circumflex femoral artery. The venous blood is drained by the inferior gluteal vein, a tributary of the internal iliac vein.
The quadratus femoris is unique in its ability to assist in both abduction and adduction movements of the leg. When the leg is in the anatomical position, the quadratus femoris works with other muscles to adduct the thigh at the hip joint. Conversely, when the hip is flexed, the quadratus femoris, along with muscles like the piriformis and obturator internus, acts to abduct the thigh. Due to its location inside the hip joint, the quadratus femoris plays a crucial role in stabilizing the joint and preventing injuries.
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Frequently asked questions
The gluteus maximus is the largest muscle of the gluteal region.
Tensor fascia latae is the most anterior of the superficial gluteal muscles.
Piriformis is the most superior muscle of the deep gluteal group.
The gluteus maximus, gluteus medius, and gluteus minimus are all part of the buttocks.
