Vastus muscles

Human thigh muscles

Vastus muscles

Muscles of lower extremity

Details
Origin| Femur
Insertion| Quadriceps tendon
Artery| Femoral artery
Nerve| Femoral nerve
Actions| Extension of knee joint
Anatomical terms of muscle

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The vastus muscles are three of the four muscles that make up the quadriceps femoris muscle of the thigh. The three muscles are the vastus intermedius, the vastus lateralis, and the vastus medialis located in the middle, on the outside, and inside of the thigh, respectively. The fourth muscle is the rectus femoris muscle a large fleshy muscle which covers the front and sides of the femur.

## Vastus intermedius[edit]

Main article: Vastus intermedius

The vastus intermedius arises from the front and lateral surfaces of the body of the femur in its upper two-thirds, sitting under the rectus femoris muscle and from the lower part of the lateral intermuscular septum. Its fibers end in a superficial aponeurosis, which forms the deep part of the quadriceps tendon.

The vastus medialis and vastus intermedius appear to be inseparably united, but when the rectus femoris has been reflected[when defined as?] a narrow interval will be observed extending upward from the medial border of the patella between the two muscles, and the separation may be continued as far as the lower part of the intertrochanteric line, where, however, the two muscles are frequently continuous.

## Vastus lateralis[edit]

Main article: Vastus lateralis

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. These form an aponeurosis, a broad flat tendon which covers the upper three-quarters of the muscle. From the inner surface of the aponeurosis, many muscle fibres originate. Some additional fibres arise from the tendon of the gluteus maximus muscle, and from the septum between the vastus lateralis and short head of the biceps femoris.

The fibers form a large fleshy mass, attached to a second strong aponeurosis, placed on the deep surface of the lower part of the muscle. This lower aponeurosis becomes contracted and thickened into a flat tendon that attaches to the outer border of the patella, and subsequently joins with the quadriceps femoris tendon, expanding the capsule of the knee joint.

## Vastus medialis[edit]

Main article: Vastus medialis

The vastus medialis arises medially along the entire length of the femur, and attaches with the other muscles of the quadriceps in the quadriceps tendon.[1] The vastus medialis muscle originates from a continuous line of attachment on the femur, which begins on the front and middle side (anteromedially) on the intertrochanteric line of the femur. It continues down and back (posteroinferiorly) along the pectineal line and then descends along the inner lip of the linea aspera and onto the medial supracondylar line of the femur. The fibers converge onto the medial part of the quadriceps tendon and the medial border of the patella.[1] The obliquus genus muscle is the most distal segment of the vastus medialis muscle. Its specific training plays an important role in maintaining patella position and limiting injuries to the knee. With no clear delineation, it is simply the most distal group of fibers of the vastus medialis.

## Additional images[edit]

* Right femur. Anterior surface.

* Right femur. Posterior surface.

* Muscles of the iliac and anterior femoral regions.

* Cross-section through the middle of the thigh.

* Vastus intermedius muscle

* Vastus intermedius muscle

* Muscles of thigh. Cross section.

* Muscles of Thigh. Anterior views.

## References[edit]

1. ^ a b Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students. Philadelphia: Elsevier/Churchill Livingstone. pp. 518–519. ISBN 978-0-8089-2306-0.

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Muscles of the hip and human leg

Iliac region|

* Iliopsoas
* Psoas major/Psoas minor
* Iliacus

Buttocks|

* Gluteal muscles
* Maximus
* Medius
* Minimus
* 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 canal
* 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
* Fibularis (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|

* Fibularis (peroneus) muscles
* Longus
* Brevis

Fascia|

* Pes anserinus

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
* Foexor hallucis brevis
* Adductor hallucis
* Flexor digiti minimi brevis
* 4th layer
* Dorsal interossei
* Plantar interossei

Fascia|

* Plantar fascia
* retinacula
* Peroneal
* Inferior extensor
* Superior extensor
* Flexor

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