BIOL4260 Study Guide - Midterm Guide: Epicondyle, Direct Air, Hyaline Cartilage
Document Summary
If straight, the stress would go to the discs of fibrocartilage and get flattened: fetus spine displays on primary curves (c shaped, that"s the (cid:449)ay fish de(cid:448)elop (cid:894)a(cid:374)terior to posterior(cid:895, somites are added in that fashion. Leads to impaired function: general structure of vertebrae, body to two paired pedicles, to two paired facets (superior side), to two paired lamina which meet at spine, all have this general structure. Inside the concavity of the body is the intervertebral discs which are a remnant of the notochord, a mesodermal derivative that gets broken up and inserted between vertebrae: herniated discs, mechanical (trauma) or aging. Loss of cushioning properties (sponginess: when pulp of disc slips through ligaments, ligaments can cut disc into different pieces. Insert prosthetic or fuse vertebrae together: or ligaments connecting vertebrae tear and disc can escape when gap is created by motion, painful because disc puts pressure on surrounding spinal nerves.
