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Talus bone
 
 
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See talus
Talus

Talus may refer to* Talus , a sloped portion of a fortified wall* Talus bone, the ankle bone, connecting the leg to the foot* List of Star Wars planets #Talus, a planet in the Star Wars universe...
 for other meanings of the word
The talus bone or astragalus is a bone in the tarsus
Tarsus (skeleton)

In tetrapods, the tarsus are the cluster of bones in the foot between the tibia and fibula and the metatarsus. The bones of the tarsus do not belong to individual toes, whereas those of the metatarsus do....
 of the foot
Foot

The foot is an anatomical structure found in many animals. It is the terminal portion of a limb which bears weight and allows locomotion. In many animals with feet, the foot is a separate organ at the terminal part of the leg made up of one or more segments or bones, generally including claws or nails....
 that forms the lower part of the ankle joint through its articulations with the lateral and medial malleoli of the two bones of the lower leg, the tibia
Tibia

The tibia, shinbone, or shankbone is the larger and stronger of the two bones in the leg below the knee in vertebrates and connects the knee with the ankle bones....
 and fibula
Fibula

The fibula or calf bone is a bone located on the lateral side of the tibia, with which it is connected above and below. It is the smaller of the two bones, and, in proportion to its length, the most slender of all the long bones....
. Within the tarsus, it articulates with the calcaneus
Calcaneus

In humans, the calcaneus or heel bone is a bone of the Tarsus of the foot which constitute the heel. In some other animals, it is the point of the hock ....
 below and navicular in front. Through these articulations, it transmits the entire weight of the body to the foot.

The second largest of the tarsal bones, it is also one of the bones in the human body with the highest percentage of its surface area covered by articular cartilage
Cartilage

Cartilage is a type of dense connective tissue. It is composed of specialized cells called chondrocyte that produce a large amount of extracellular matrix composed of collagen fibers, abundant ground substance rich in proteoglycan, and elastin fibers....
.






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See talus
Talus

Talus may refer to* Talus , a sloped portion of a fortified wall* Talus bone, the ankle bone, connecting the leg to the foot* List of Star Wars planets #Talus, a planet in the Star Wars universe...
 for other meanings of the word
The talus bone or astragalus is a bone in the tarsus
Tarsus (skeleton)

In tetrapods, the tarsus are the cluster of bones in the foot between the tibia and fibula and the metatarsus. The bones of the tarsus do not belong to individual toes, whereas those of the metatarsus do....
 of the foot
Foot

The foot is an anatomical structure found in many animals. It is the terminal portion of a limb which bears weight and allows locomotion. In many animals with feet, the foot is a separate organ at the terminal part of the leg made up of one or more segments or bones, generally including claws or nails....
 that forms the lower part of the ankle joint through its articulations with the lateral and medial malleoli of the two bones of the lower leg, the tibia
Tibia

The tibia, shinbone, or shankbone is the larger and stronger of the two bones in the leg below the knee in vertebrates and connects the knee with the ankle bones....
 and fibula
Fibula

The fibula or calf bone is a bone located on the lateral side of the tibia, with which it is connected above and below. It is the smaller of the two bones, and, in proportion to its length, the most slender of all the long bones....
. Within the tarsus, it articulates with the calcaneus
Calcaneus

In humans, the calcaneus or heel bone is a bone of the Tarsus of the foot which constitute the heel. In some other animals, it is the point of the hock ....
 below and navicular in front. Through these articulations, it transmits the entire weight of the body to the foot.

The second largest of the tarsal bones, it is also one of the bones in the human body with the highest percentage of its surface area covered by articular cartilage
Cartilage

Cartilage is a type of dense connective tissue. It is composed of specialized cells called chondrocyte that produce a large amount of extracellular matrix composed of collagen fibers, abundant ground substance rich in proteoglycan, and elastin fibers....
. Additionally, it is also unique in that it has a retrograde
Retrograde

Retrograde may refer to:* Retrograde signaling, in neuroscience* Retrograde, a type of Permutation * Retrograde and direct motion, the movement of an astronomical object...
 blood supply, i.e. arterial blood enters the bone at the distal end.

Structure

Though irregular in shape, the talus can be subdivided into three parts.

Facing anteriorly, the head
Head of talus

The talus bone of the ankle joint connects the leg to the foot.For descriptive purposes the talus bone is divided into three sections, Neck of talus, body of talus and head of talus....
 carries the articulate surface of the navicular bone, and the neck
Neck of talus

The neck of talus is directed forward and medialward, and comprises the constricted portion of the bone between the body and the oval head.Its upper and medial surfaces are rough, for the attachment of ligaments; its lateral surface is concave and is continuous below with the deep groove for the interosseous talocalcaneal ligament....
, the roughened area between the body and the head, has small vascular channels.

The body
Body of talus

The body of the talus comprises most of the volume of the talus bone. It presents with five surfaces....
 features several prominent articulate surfaces: On its superior side is the trochlea tali flanked by the articulate facets for the two malleoli. The ankle mortise, the fork-like structure of the malleoli, holds these three articulate surfaces in a steady grip, which guarantees the stability of the ankle joint. However, because the trochlea is wider in front than at the back (approximately 5-6 mm) the stability in the joint vary with the position of the foot: with the foot dorsiflexed (toes pulled upward) the ligaments of the joint are kept stretched, which guarantees the stability of the joint; but with the foot plantarflexed (as when standing on the toes) the narrower width of the trochlea causes the stability to decrease. Behind the trochlea is a posterior process with a medial and a lateral tubercle separated by a groove for the tendon of the flexor hallucis longus
Flexor hallucis longus muscle

The Flexor hallucis longus muscle is a muscle of the leg.It is one of the deep muscles of the posterior compartment of the leg. The other deep muscles of the leg are flexor digitorum longus and tibialis posterior....
. Exceptionally, the lateral of these tubercles forms an independent bone called os trigonum or "accesory talus". On the bone's inferior side, three articular surfaces serve for the articulation with the calcaneus, and several variously developed articular surfaces exist for the articulation with ligaments.

During the 7-8th intrauterine
Uterus

The uterus is a major female hormone-responsive reproductive sex organ of most mammals, including humans. It is within the uterus that the fetus develops during gestation....
 month an ossification center is formed in the talus.

Use as dice

Due to the way that the talus bone of a hoofed animal is shaped, it can land in one of four positions. This fact led to the bone assuming a role as a form of die
Dice

A die is a small polyhedron object, usually cubic, used for generating Statistical randomnesss or other symbols. This makes dice suitable as gambling devices, especially for craps or sic bo, or for use in non-gambling tabletop games....
 in games of chance and gambling
Gambling

Gambling is the wikt:wager#Verb of money or something of material Value on an event with an uncertain outcome with the primary intent of winning additional money and/or material goods....
, such as Knucklebones
Knucklebones

Knucklebones also known as hucklebones, dibs, dibstones, jackstones, chuckstones or five-stones, is a game of very ancient origin, played with five small objects, originally the knucklebones of a sheep, which are thrown up and caught in various ways....
.

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