The semitendinosus is a muscle Muscle is the contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to produce force and cause motion. Muscles can cause in the back of the thigh In humans the thigh is the area between the pelvis and the knee. Anatomically, it is part of the lower limb; it is one of the hamstrings In human anatomy, the hamstring refers to one of the three posterior thigh muscles, or to the tendons that make up the borders of the space behind the knee. In modern anatomical contexts, however, they usually refer to the posterior thigh muscles, or the tendons of the semitendinosus, the semimembranosus and the biceps femoris. In quadrupeds, it.

Contents

Structure

The semitendinosus, remarkable for the great length of its tendon A tendon is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension. Tendons are similar to ligaments and fascia as they are all made of collagen except that ligaments join one bone to another bone, and fascia connect muscles to other muscles. Tendons and muscles work together and can of insertion, is situated at the posterior and medial aspect of the thigh In humans the thigh is the area between the pelvis and the knee. Anatomically, it is part of the lower limb .

It arises from the lower and medial impression on the tuberosity of the ischium, by a tendon common to it and the long head of the biceps femoris The biceps femoris is a muscle of the posterior thigh. As its name implies, it has two parts, one of which (the long head) forms part of the hamstrings muscle group; it also arises from an aponeurosis Aponeuroses are layers of flat broad tendons. They have a shiny, whitish-silvery color, and are histologically similar to tendons, but are very sparingly supplied with blood vessels and nerves. When dissected, aponeuroses are papery, and peel off by sections. The primary regions with thick aponeurosis is in the ventral abdominal region, the dorsal which connects the adjacent surfaces of the two muscles to the extent of about 7.5 cm. from their origin.

The muscle is fusiform and ends a little below the middle of the thigh in a long round tendon which lies along the medial side of the popliteal fossa The popliteal fossa is a space or shallow depression located at the back of the knee-joint. The bones of the popliteal fossa are the femur and the tibia. Colloquially, it is referred to as a "knee pit."; it then curves around the medial condyle of the tibia and passes over the tibial collateral ligament of the knee-joint The knee joint joins the thigh with the leg and consists of two articulations: one between the femur and tibia, and one between the femur and patella. It is the largest joint in the human body and is very complicated. The knee is a mobile trocho-ginglymus , which permits flexion and extension as well as a slight medial and lateral rotation. Since, from which it is separated by a bursa, and is inserted into the upper part of the medial surface of the body of the tibia, nearly as far forward as its anterior crest.

At its insertion it gives off from its lower border a prolongation to the deep fascia of the leg and lies behind the tendon of the sartorius The Sartorius muscle is a long thin muscle that runs down the length of the thigh. It is the longest muscle in the human body. Its upper portion forms the lateral border of the femoral triangle, and below that of the gracilis The Gracilis is the most superficial muscle on the medial side of the thigh. It is thin and flattened, broad above, narrow and tapering below. It arises by a thin aponeurosis from the anterior margins of the lower half of the symphysis pubis and the upper half of the pubic arch, to which it is united. These three tendons form what is known as the pes anserinus, so named because it looks like the foot of a goose.

A tendinous intersection is usually observed about the middle of the muscle.

Innervation

The semitendinosus is innervated by the tibial part of the sciatic nerve The sciatic nerve is a large nerve fiber in humans and other animals. It begins in the lower back and runs through the buttock and down the lower limb. It is the longest and widest single nerve in the human body.

Actions

The semitendinosus helps to extend Extension is a movement of a joint that results in increased angle between two bones or body surfaces at a joint. Extension usually results in straightening of the bones or body surfaces involved. For example, extension is produced by extending the flexed elbow. Straightening of the arm would require extension at the elbow joint. If the head is (straighten) the hip joint In human anatomy, hip refer to either an anatomical region or a joint and flex In anatomy, flexion is a position that is made possible by the joint angle decreasing. The skeletal and muscular (muscles and tendons) systems work together to move the joint into a "flexed" position. For example the elbow is flexed when the hand is brought closer to the shoulder. The trunk may be flexed toward the legs or the neck to (bend) the knee joint The knee joint joins the thigh with the leg and consists of two articulations: one between the femur and tibia, and one between the femur and patella. It is the largest joint in the human body and is very complicated. The knee is a mobile trocho-ginglymus , which permits flexion and extension as well as a slight medial and lateral rotation. Since. It also helps medially rotate the knee.

Additional images

Right hip bone. External surface.

The popliteal, posterior tibial, and peroneal arteries.

Back of left lower extremity.

See also

External links

This article was originally based on an entry from a public domain Works are in the public domain if they are not covered by intellectual property rights at all, if the intellectual property rights have expired, and/or if the intellectual property rights are forfeited. Examples include the English language, the formulae of Newtonian physics, as well as the works of Shakespeare and the patents over powered flight edition of Gray's Anatomy Henry Gray's Anatomy of the Human Body, commonly shortened to Gray's Anatomy, by Henry Gray, is an English-language human anatomy textbook widely regarded as a classic work on the subject. As such, some of the information contained within it may be outdated.

List of muscles There are approximately 640 skeletal muscles within the typical human, and almost every muscle constitutes one part of a pair of identical bilateral muscles, found on both sides, resulting in approximately 320 pairs of muscles, as presented in this article. Nevertheless, the exact number is difficult to define because different sources group of lower limbs Although in common usage, the human leg or leg can refer to the entire lower extremity or limb of the human body, including the foot, thigh and even the hip or gluteal region, the precise definition in human anatomy refers to the section of the lower limb extending between the knee and the ankle (TA A04.7 Terminologia Anatomica is the international standard on human anatomic terminology. It was developed by the Federative Committee on Anatomical Terminology (FCAT) and the International Federation of Associations of Anatomists (IFAA) and was released in 1998. It supersedes the previous standard, Nomina Anatomica. Terminologia Anatomica contains, GA 4.465 masseter · temporalis · pterygoid (lateral, medial))
ILIAC Region The ilium is the uppermost and largest bone of the pelvis, and appears in most vertebrates including mammals and birds, but not bony fish. All reptiles have an ilium except snakes, although some snake species have a tiny bone which is considered to be an ilium / ILIOPSOAS These muscles are distinct in the abdomen, but usually indistinguishable in the thigh. As such, they are usually given a common name and are referred to as the "dorsal hip muscles" or "inner hip muscles" psoas major The psoas major is a long fusiform muscle placed on the side of the thoracic region of the vertebral column and brim of the lesser pelvis. It joins the iliacus muscle to form the iliopsoas. In less than 50 percent of subjects the psoas major is accompanied by the psoas minor/psoas minor The psoas minor is a long, slender skeletal muscle which, when present, is located in front of the psoas major muscle. This muscle does not exist in about half the population · iliacus The iliacus arises from the iliac fossa on the interior side of the hip bone, and also from the region of the anterior inferior iliac spine . It joins the psoas major to form the Iliopsoas as which it proceeds across the iliopubic eminence through the muscular lacuna to its insertion on the lesser trochanter of the femur. Its fibers are often
BUTTOCKS

gluteals The gluteal muscles are the three muscles that make up the buttocks: the gluteus maximus muscle, gluteus medius muscle and gluteus minimus muscle: (maximus 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 buttocks, medius The gluteus medius , one of the three gluteal muscles, is a broad, thick, radiating muscle, situated on the outer surface of the pelvis, minimus The gluteus minimus , the smallest of the three gluteal muscles, is situated immediately beneath the gluteus medius) · tensor fasciae latae It arises from the anterior part of the outer lip of the iliac crest; from the outer surface of the anterior superior iliac spine, and part of the outer border of the notch below it, between the gluteus medius and sartorius; and from the deep surface of the fascia lata

lateral rotator group gluteals: · tensor fasciae latae: quadratus femoris The quadratus femoris is, as its name implies, a flat, quadrilateral skeletal muscle. Located on the posterior side of the hip joint, it is a strong lateral rotator and adductor of the thigh, but also acts to stabilize the femoral head in the Acetabulum · inferior gemellus The inferior gemellus muscle is a muscle of the human body. The Gemelli are two small muscular fasciculi, accessories to the tendon of the Obturator internus which is received into a groove between them · obturator internus The obturator internus muscle originates on the medial surface of the obturator membrane, the ischium near the membrane, and the rim of the pubis · superior gemellus The Gemelli are two small muscular fasciculi, accessories to the tendon of the Obturator internus which is received into a groove between them · piriformis The piriformis is a muscle in the gluteal region of the lower limb
THIGH In humans the thigh is the area between the pelvis and the knee. Anatomically, it is part of the lower limb / compartments
Anterior The anterior fascial compartment of thigh contains the knee extensors and hip flexors sartorius The Sartorius muscle is a long thin muscle that runs down the length of the thigh. It is the longest muscle in the human body. Its upper portion forms the lateral border of the femoral triangle · quadriceps The quadriceps femoris , also called simply the quadriceps, quadriceps extensor, quads, is a large muscle group that includes the four prevailing muscles on the front of the thigh. It is the great extensor muscle of the knee, forming a large fleshy mass which covers the front and sides of the femur. It is the strongest and leanest muscle in the (rectus femoris, vastus lateralis The Vastus lateralis is the largest part of the Quadriceps femoris. It arises by a broad aponeurosis, which is attached to the upper part of the intertrochanteric line, to the anterior and inferior borders of the greater trochanter, to the lateral lip of the gluteal tuberosity, and to the upper half of the lateral lip of the linea aspera; this, 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 Rectus Femoris 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 femoris tendon, vastus medialis) · articularis genu
Posterior/hamstring biceps femoris · semitendinosus · semimembranosus
Medial pectineus · obturator externus · gracilis · adductor (longus, brevis, magnus)
Fascia

Femoral sheath (Femoral canal) · Femoral ring

Adductor canal · Adductor hiatus

fascia lata (Iliotibial tract, Lateral intermuscular septum of thigh, Medial intermuscular septum of thigh, Fascia cribrosa/Saphenous opening) · Muscular lacuna
LEG/ Crus/ 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 peroneus muscles (longus, brevis)
Fascia

Pes anserinus

crural fascia (Anterior crural intermuscular septum, Posterior crural intermuscular septum, Transverse intermuscular septum)
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)

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