Cartilage is a connective tissue consisting of a dense matrix of collagen fibres and elastic fibres embedded in a rubbery ground substance. The matrix is produced by cells called chondroblasts, which become embedded in the matrix as chondrocytes.
The Brass Armillary Sundial is a beautiful accent in a courtyard or garden, and also functions as a timepiece. Artisan crafted of solid brass with accents and raised Roman numerals, the sundial has a two-tone verdigris and polished brass finish the will further develop its beautiful patina over time. Heirloom quality garden art with hand buffed and polished finish
An armillary sphere is a tool that can be used to solve various astronomical problems or as an educational tool to represent movements in the heavens.ime Frame. It's unclear exactly when armillary spheres were first invented. Some believe that they were invented by Eratosthenes, a Greek astronomer, around 255 BC, but the lack of detail in the writings of various Greek and Roman commentators and historians casts some doubt on this assertion.