In a few cases, amber has preserved spiders' egg sacs and webs, occasionally with prey attached; the oldest fossil web found so far is 100 million years old. Earlier spider fossils come from a few lagerstÃ¤tten, places where conditions were exceptionally suited to preserving fairly soft tissues.
Definition of METATARSAL. : of, relating to, or being the part of the human foot or of the hind foot in quadrupeds between the tarsus and the phalanges that in humans comprises five elongated bones which form the front of the instep and ball of the foot. See metatarsal defined for kids.ADVERTISEMENT. of, relating to, or being the part of the human foot or of the hind foot in quadrupeds between the tarsus and the phalanges that in humans comprises five elongated bones which form the front of the instep and ball of the foot. See metatarsal defined for kids. ADVERTISEMENT.
A metatarsal osteotomy is a surgical procedure performed to treat a foot deformity called a bunion. This surgery involves cutting the metatarsal bone of the big toe and realigning the bone to correct the deformity.ild toe deformity is often treated with a procedure called a chevron metatarsal osteotomy. In this procedure, the metatarsal cut is made at the end of the bone closest to the tip of the toe, which is sufficient when the degree of toe bending is small.