| Gluteal muscles |
|
Muscles of the gluteal and posterior femoral regions. Gluteus minimus and the origins and insertions of medius and maximus labeled
|
|
Gluteus maximus
|
| Details |
| Components |
Gluteus maximus, medius and minimus |
| Artery |
Superior and inferior gluteal arteries |
| Vein |
Superior and inferior gluteal veins |
| Nerve |
Superior and inferior gluteal nerves (L4, L5, S1 and S2 nerve roots) |
| Anatomical terminology
[edit on Wikidata]
|
The gluteal muscles are a group of three muscles which make up the buttocks: the gluteus maximus, gluteus medius and gluteus minimus. The three muscles originate from the ilium and sacrum and insert on the femur. The functions of the muscles include extension, abduction, external rotation and internal rotation of the hip joint.
Contents
- 1 Structure
- 1.1 Gluteus maximus
- 1.2 Gluteus medius
- 1.3 Gluteus minimus
- 2 Function
- 3 Clinical significance
- 4 Society and culture
- 4.1 Exercise and stretching
- 5 See also
- 6 Additional images
- 7 References
- 8 External links
Structure
The gluteus maximus is the largest and most superficial of the three gluteal muscles. It makes up a large portion of the shape and appearance of the hips. It is a narrow and thick fleshy mass of a quadrilateral shape, and forms the prominence of the nates. The gluteus medius is a broad, thick, radiating muscle, situated on the outer surface of the pelvis. It lies profund to the gluteus maximus and its posterior third is covered by the gluteus maximus, its anterior two-thirds by the gluteal aponeurosis, which separates it from the superficial fascia and integument. The gluteus minimus is the smallest of the three gluteal muscles and is situated immediately beneath the gluteus medius.
The bulk of the gluteal muscle mass contributes only partially to shape of the buttocks. The other major contributing factor is that of the panniculus adiposus of the buttocks, which is very well developed in this area, and gives the buttock its characteristic rounded shape. Although the gluteal muscle bulk and tone can be improved with exercise, it is the disposition of the overlying panniculus adiposus which may be responsible for the "sagging butt" phenomenon.[citation needed] Exercise in general (not only of the gluteal muscles but of the body in general) which can contribute to fat loss can lead to reduction of mass in subcutaneal fat storage locations on the body which includes the panniculus, so for leaner and more active individuals, the glutes will more predominantly contribute to the shape than someone less active with a fattier composition.[citation needed] The degree of body fat stored in various locations such as the panniculus is dictated by genetic and hormonal profiles.[citation needed]
Gluteus maximus
Main article: gluteus maximus muscle
The gluteus maximus arises from the posterior gluteal line of the inner upper ilium, and the rough portion of bone including the crest, immediately above and behind it; from the posterior surface of the lower part of the sacrum and the side of the coccyx; from the aponeurosis of the erector spinae (lumbodorsal fascia), the sacrotuberous ligament, and the fascia covering the gluteus medius. The fibers are directed obliquely downward and lateralward; The muscle has two insertions: Those forming the upper and larger portion of the muscle, together with the superficial fibers of the lower portion, end in a thick tendinous lamina, which passes across the greater trochanter, and inserts into the iliotibial band of the fascia lata; and the deeper fibers of the lower portion of the muscle are inserted into the gluteal tuberosity between the vastus lateralis and adductor magnus. Its action is to extend and to laterally rotate the hip, and also to extend the trunk.[citation needed]
Gluteus medius
Main article: gluteus medius muscle
The gluteus medius muscle originates on the outer surface of the ilium between the iliac crest and the posterior gluteal line above, and the anterior gluteal line below; the gluteus medius also originates from the gluteal aponeurosis that covers its outer surface. The fibers of the muscle converge into a strong flattened tendon that inserts on the lateral surface of the greater trochanter. More specifically, the muscle's tendon inserts into an oblique ridge that runs downward and forward on the lateral surface of the greater trochanter.
Gluteus minimus
Main article: gluteus minimus muscle
The gluteus minimus is fan-shaped, arising from the outer surface of the ilium, between the anterior and inferior gluteal lines, and behind, from the margin of the greater sciatic notch. The fibers converge to the deep surface of a radiated aponeurosis, and this ends in a tendon which is inserted into an impression on the anterior border of the greater trochanter, and gives an expansion to the capsule of the hip joint.
Function
The functions of muscles includes extension, abduction, lateral(external) rotation and medial (internal) rotation of the hip joint. The gluteus maximus also supports the extended knee through the iliotibial tract.
Clinical significance
Sitting for long periods can lead to the gluteal muscles atrophying through constant pressure and disuse. This may be associated with (although not necessarily the cause of) lower back pain, difficulty with some movements that naturally require the gluteal muscles, such as rising from the seated position, and climbing stairs.
Society and culture
Exercise and stretching
Any exercise that works and/or stretches the buttocks is suitable, for example lunges, hip thrusts, climbing stairs, fencing, bicycling, rowing, squats, arabesque, aerobics, and various specific exercises for the bottom. Weight training exercises which are known to significantly strengthen the gluteal muscles include the squat, deadlift, leg press, any other movements involving external hip rotation and hip extension.
See also
This article uses anatomical terminology; for an overview, see Anatomical terminology.
Additional images
-
Position of gluteus maximus muscle
-
Position of gluteus medius muscle
-
Position of gluteus minimus muscle
References
- McMinn, RMH (Ed) (1994) Last's Anatomy: Regional and applied (9th Ed). London: Churchill Livingstone. ISBN 0-443-04662-X
External links
- 8b. The Muscles and Fasciæ of the Thigh Bartleby.com, Henry Gray, Anatomy of the Human Body, 1918.
|
Muscles of the hip and human leg
|
| Iliac region |
- Iliopsoas
- psoas major/psoas minor
- iliacus
|
| Buttocks |
- Gluteal muscles
- tensor fasciae latae
|
| lateral rotator group: |
- quadratus femoris
- inferior gemellus
- superior gemellus
- internal obturator
- external obturator
- piriformis
|
|
Thigh /
compartments |
| Anterior |
- sartorius
- quadriceps
- rectus femoris
- vastus lateralis
- vastus intermedius
- vastus medialis
- articularis genus
|
| Posterior |
- hamstring
- biceps femoris
- semitendinosus
- semimembranosus
|
| Medial |
- pectineus
- external obturator
- gracilis
- adductor
- longus
- brevis
- magnus
- minimus
|
| Fascia |
- Femoral sheath
- Femoral ring
- Adductor canal
- Adductor hiatus
- Muscular lacuna
|
| fascia lata |
-
- Iliotibial tract
- Lateral intermuscular septum of thigh
- Medial intermuscular septum of thigh
- Cribriform fascia
|
|
|
Leg/
compartments |
| Anterior |
- tibialis anterior
- extensor hallucis longus
- extensor digitorum longus
- peroneus tertius
|
| Posterior |
| superficial |
- triceps surae
- gastrocnemius
- soleus
- accessory soleus
- Achilles tendon
- plantaris
|
| deep |
- tarsal tunnel
- flexor hallucis longus
- flexor digitorum longus
- tibialis posterior
- popliteus
|
|
| Lateral |
|
| Fascia |
|
|
| Intermuscular septa |
- anterior
- posterior
- transverse
|
|
|
| Foot |
| Dorsal |
- extensor hallucis brevis
- extensor digitorum brevis
|
| Plantar |
- 1st layer
- abductor hallucis
- flexor digitorum brevis
- abductor digiti minimi
- 2nd layer
- quadratus plantae
- lumbrical muscle
- 3rd layer
- flexor hallucis brevis
- adductor hallucis
- flexor digiti minimi brevis
- 4th layer
- dorsal interossei
- plantar interossei
|
| Fascia |
- Plantar fascia
- retinacula
- Peroneal
- Inferior extensor
- Superior extensor
- Flexor
|
|
