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.
The medical term for foot pain, metatarsalgia, comes from the name of the bones that are in this part of the foot: the metatarsals. The metatarsals are long bones at the base of each toe. Sometimes pressure on the ends of the metatarsal bones causes symptoms in the ball of the foot. There are many other causes of foot pain in other parts of the foot. Some other areas of the foot that can be sources of pain include: Toe pain and bunions.