Anatomic.us > Skeletal System > Skeletal System of the Foot

Talus

Os trigonum, Astragalus; is the Latin word for talus or ankle bone. There is a cluster of seven articulating bones in each foot joining the lower end of tibia and fibula to the meta-tarsal bone. These bones are called tarsal bone and among these tarsal bones is an irregular shaped bone called talus Bone or ankle Bone.

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Talus

SUBDIVISION

The talus can be subdivided into three parts; Head, Neck and Body.

  1. The head forms a joint with the Navicular bone.

  2. Neck is a roughened area in between body and head having small vascular channels.

  3. Body has several visible joint surfaces. Its superior surface is semi-cylindrical with joint facets for two Malleoli and under surface of tibia. Malleoli are fork like structures that help keep ankle bone in place resulting in the stability of ankle joint

The ankle joint

Talus is one of the most important bones when it comes to ankle joints. Superiorly, laterally and medially this bone is attached to the distal end, lateral and medial malleolus of tibia respectively. Inferiorly, this bone is attached to Calcaneous bone and anteriorly Talus is attached to Navicular bone.

MUSCLES ATTACHMENT

Talus bone, unlike any other bone, has no muscle attachments. Thus it is dependent on neighboring bones for maintaining its position and stability.

BLOOD SUPPLY

The blood supply of talus bone is not very efficient. Because of this fact broken talus bone takes longer to heal than any other bone. Thus a fracture of it bounds the person to walk with crutches for few weeks and afterwards walking with a cast or a boot.

EVOLUTION

Talus is apparently derived from fusion of three separate bone of Amphibians; Tibiale (articulating with tibia), Intermedium (between bases of tibia and fibula) and Centrale (in mid-part of tarsus). The talus joint in mammals is flexible than reptiles.


SUBDIVISION

The talus can be subdivided into three parts; Head, Neck and Body.

  1. The head forms a joint with the Navicular bone.

  2. Neck is a roughened area in between body and head having small vascular channels.

  3. Body has several visible joint surfaces. Its superior surface is semi-cylindrical with joint facets for two Malleoli and under surface of tibia. Malleoli are fork like structures that help keep ankle bone in place resulting in the stability of ankle joint

The ankle joint

Talus is one of the most important bones when it comes to ankle joints. Superiorly, laterally and medially this bone is attached to the distal end, lateral and medial malleolus of tibia respectively. Inferiorly, this bone is attached to Calcaneous bone and anteriorly Talus is attached to Navicular bone.

MUSCLES ATTACHMENT

Talus bone, unlike any other bone, has no muscle attachments. Thus it is dependent on neighboring bones for maintaining its position and stability.

BLOOD SUPPLY

The blood supply of talus bone is not very efficient. Because of this fact broken talus bone takes longer to heal than any other bone. Thus a fracture of it bounds the person to walk with crutches for few weeks and afterwards walking with a cast or a boot.

EVOLUTION

Talus is apparently derived from fusion of three separate bone of Amphibians; Tibiale (articulating with tibia), Intermedium (between bases of tibia and fibula) and Centrale (in mid-part of tarsus). The talus joint in mammals is flexible than reptiles.

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