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.
Metatarsalgia is a condition involving pain of your metatarsals; it can be caused by high-impact activities and improper footwear. Repetitive stress on your metatarsals from activities such as running can lead to a metatarsal stress fracture or crack. An avulsion fracture can also occur to your fifth metatarsal, which is located on the outside of your foot. An avulsion fracture is when a forceful movement causes a piece of your bone to break.