Corpus: Quadriceps femoris muscle: Unterschied zwischen den Versionen

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Synonym: quadriceps muscle of thigh

Definition

The quadriceps femoris muscle is located on the ventral side of the thigh, above the articularis genus muscle. It consists of four parts: the rectus femoris, vastus intermedius, vastus medialis, and vastus lateralis muscles.

Course

Rectus femoris muscle

from Latin: rectus - right, upright

The rectus femoris muscle has two heads: the straight head which originates from the anterior inferior iliac spine, and the reflected head, a highly variable structure that originates from the upper edge of the acetabulum. The muscle’s tendon begins approximately ten centimeters above the patella. As a bi-articular muscle, the rectus femoris contributes to both knee extension and hip flexion.

Vastus intermedius muscle

from Latin: vastus - wide

The vastus intermedius originates from the front and lateral surfaces of the upper two-thirds of the femur. About halfway down the femur, the muscle fibers converge into a tendon. This muscle is generally located beneath the rectus femoris.

Vastus lateralis muscle

The vastus lateralis muscle, the largest of the quadriceps heads, originates mainly from a broad aponeurosis attached to the upper part of the intertrochanteric line, the greater trochanter, and the linea aspera of the femur. Some fibers also originate from the lateral intermuscular septum.

Vastus medialis muscle

The vastus medialis muscle originates on the medial side of the femur, from the intertrochanteric line and extending along the medial lip of the linea aspera down to the supracondylar line.

The common tendon of the quadriceps muscles attaches to the upper part of the patella. Some fibers extend over the patella, enclosing it as a sesamoid bone. Force is transmitted to the lower leg through the patellar ligament, which inserts at the tibial tuberosity.

Innervation

The quadriceps femoris muscle is innervated by the femoral nerve (L2-L4 segments) from the lumbar plexus.

Function

The quadriceps femoris muscle is the primary extensor of the knee joint, essential for straightening the body (e.g., from a squatting position). It works against gravity and is significantly stronger than the hamstrings. The rectus femoris also flexes the hip joint, though its effect is relatively weak. Full knee extension by the quadriceps is only achieved when the hip is extended, as the rectus femoris becomes insufficiently effective when the hip is flexed.

The quadriceps also stabilize the patella within its groove. Uneven muscle development in this group can lead to patellar dislocation.

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-{{Raw}}
 ''Synonym: quadriceps muscle of thigh''
 == Definition ==
-The '''quadriceps femoris muscle''' is located on the ventral side of the thigh and lies above the articulatio genus muscle. It consists of four parts: the rectus femoris muscle, the vastus intermedius muscle, the vastus medialis muscle and the vastus lateralis muscle.<dcembed ratio="16x9"><dcEmbedUrl src="https://www.doccheck.com/de/detail/photos/43219-musculus-quadriceps-femoris"></dcEmbedUrl></dcembed>
+The '''quadriceps femoris muscle''' is located on the ventral side of the [[Corpus:Thigh|thigh]], above the [[Corpus:Articularis genus muscle|articularis genus muscle]]. It consists of four parts: the [[Corpus:Rectus femoris muscle|rectus femoris]], [[Corpus:Vastus intermedius muscle|vastus intermedius]], [[Corpus:Vastus medialis muscle|vastus medialis]], and [[Corpus:Vastus lateralis muscle|vastus lateralis muscles]].<dcembed ratio="16x9"><dcEmbedUrl src="https://www.doccheck.com/de/detail/photos/43219-musculus-quadriceps-femoris"></dcEmbedUrl></dcembed>
 == Course ==
-=== Musculus rectus femoris ===
+=== Rectus femoris muscle ===
 ''from Latin: rectus - right, upright''
-The rectus femoris muscle has two muscle heads. Its ''caput rectum'' originates from the anterior inferior iliac spine, the spina iliaca anterior inferior. The ''caput reflexum'', which is highly variable, originates from the upper edge of the acetabulum. The tendon of the muscle begins about ten centimetres cranial to the kneecap. As this part of the muscle is bi-articular, it also provides flexion in the hip joint in addition to extension in the knee joint.
+The rectus femoris muscle has two heads: the straight head which originates from the anterior inferior iliac spine, and the reflected head, a highly variable structure that originates from the upper edge of the [[Corpus:Acetabulum|acetabulum]]. The muscle’s [[Corpus:Tendon|tendon]] begins approximately ten centimeters above the [[Corpus:Patella|patella]]. As a bi-articular muscle, the rectus femoris contributes to both [[Corpus:Knee|knee]] extension and [[Corpus:Hip bone|hip]] flexion.
-=== Musculus vastus intermedius ===
+=== Vastus intermedius muscle ===
 ''from Latin: vastus - wide''
-The vastus intermedius muscle originates from the frontal and lateral surfaces of the upper two thirds of the thigh bone. Approximately in the middle of the bone, the muscle fibres progressively merge into a tendon. As a rule, this part of the muscle is completely covered by the rectus femoris muscle.
+The vastus intermedius originates from the front and lateral surfaces of the upper two-thirds of the [[Corpus:Femur|femur]]. About halfway down the femur, the muscle fibers converge into a tendon. This muscle is generally located beneath the rectus femoris.
-=== The vastus lateralis muscle ===
+=== Vastus lateralis muscle ===
-The vastus lateralis muscle generally has the largest muscle mass of the four heads of the quadriceps femoris. It essentially originates from a broad aponeurosis, which is attached to the cranial part of the linea intertrochanterica, the greater trochanter and the linea aspera of the femur. A smaller part of the fibres originate from the lateral intermuscular femoral septum.
+The vastus lateralis muscle, the largest of the quadriceps heads, originates mainly from a broad [[Corpus:Aponeurosis|aponeurosis]] attached to the upper part of the intertrochanteric line, the greater trochanter, and the linea aspera of the femur. Some fibers also originate from the lateral intermuscular septum.
-=== The vastus medialis muscle ===
+=== Vastus medialis muscle ===
-The vastus medialis muscle originates from the medial side of the femur, the upper part from the linea intertrochanterica. The origin follows the medial lip of the linea aspera caudally to the linea supracondylaris medialis.
+The vastus medialis muscle originates on the medial side of the femur, from the intertrochanteric line and extending along the medial lip of the linea aspera down to the supracondylar line.
-The common tendon of the four muscle parts inserts at the upper pole of the kneecap (patella). Some fibres extend over the kneecap and thus enclose the patella as a sesamoid bone. The force is transmitted to the lower leg via the patellar ligament, which inserts at the tibial tuberosity of the tibia.
+The common tendon of the quadriceps muscles attaches to the upper part of the patella. Some fibers extend over the patella, enclosing it as a [[Corpus:Sesamoid bone|sesamoid bone]]. Force is transmitted to the [[Corpus:Lower leg|lower leg]] through the [[Corpus:Patellar ligament|patellar ligament]], which inserts at the tibial tuberosity.<dcembed><dcembedurlskatchfab src="https://sketchfab.com/3d-models/ec745f7384424b8ba24e719a941bbbd1"></dcembedurlskatchfab><dcembedurlskatchfab src="https://sketchfab.com/3d-models/70befb43868f4e1dab5a916e67101f8a"></dcembedurlskatchfab><dcembedurlskatchfab src="https://sketchfab.com/3d-models/3094c775712e4a7f8c53816bfa6fd60d"></dcembedurlskatchfab><dcembedurlskatchfab src="https://sketchfab.com/3d-models/0751006659d94f8ab7570f244be4a894"></dcembedurlskatchfab><dcembedurlskatchfab src="https://sketchfab.com/3d-models/0f46cee03c784739b4152d940dccf033"></dcembedurlskatchfab></dcembed>
-<dcembed><dcembedurlskatchfab src="https://sketchfab.com/3d-models/ec745f7384424b8ba24e719a941bbbd1"></dcembedurlskatchfab><dcembedurlskatchfab src="https://sketchfab.com/3d-models/70befb43868f4e1dab5a916e67101f8a"></dcembedurlskatchfab><dcembedurlskatchfab src="https://sketchfab.com/3d-models/3094c775712e4a7f8c53816bfa6fd60d"></dcembedurlskatchfab><dcembedurlskatchfab src="https://sketchfab.com/3d-models/0751006659d94f8ab7570f244be4a894"></dcembedurlskatchfab><dcembedurlskatchfab src="https://sketchfab.com/3d-models/0f46cee03c784739b4152d940dccf033"></dcembedurlskatchfab></dcembed>
 == Innervation ==
-Innervation is provided by the femoral nerve (segments L2-L4) from the lumbar plexus.
+The quadriceps femoris muscle is innervated by the [[Corpus:Femoral nerve|femoral nerve]] (L2-L4 segments) from the [[Corpus:Lumbar plexus|lumbar plexus]].
 == Function ==
-The quadriceps femoris muscle is the only extensor of the knee joint and is therefore of immense importance for straightening the body (e.g. from a squatting position). As it works against gravity, it significantly exceeds the strength of the hamstrings. The rectus femoris muscle can also flex in the hip joint, but its effect is relatively weak. The muscle can only achieve its full extension capacity in the knee joint when the hip joint is extended because the rectus femoris muscle becomes insufficient when the hip is flexed.
+The quadriceps femoris muscle is the primary extensor of the [[Corpus:Knee joint|knee joint]], essential for straightening the body (e.g., from a squatting position). It works against gravity and is significantly stronger than the hamstrings. The rectus femoris also flexes the [[Corpus:Hip joint|hip joint]], though its effect is relatively weak. Full knee extension by the quadriceps is only achieved when the hip is extended, as the rectus femoris becomes insufficiently effective when the hip is flexed.
-The four muscles are also responsible for ensuring that the kneecap remains in its gliding groove. If they are unevenly developed, this can lead to dislocation of the kneecap.
-<dcembed ratio="16x9"><dcembedurl src="https://www.doccheck.com/de/detail/videos/3104-musculus-quadriceps"></dcembedurl></dcembed>
+The quadriceps also stabilize the patella within its groove. Uneven muscle development in this group can lead to patellar dislocation.<dcembed ratio="16x9"><dcembedurl src="https://www.doccheck.com/de/detail/videos/3104-musculus-quadriceps"></dcembedurl></dcembed>
 [[Kategorie:Corpus]]
+[[Kategorie:Muscle]]
+[[Kategorie:Leg]]