Most creatures known as sea slugs are actually snails, i.e. they are sea snails (marine gastropod mollusks) that over evolutionary time have lost their shells, or have a greatly reduced shell or an internal shell. sea cucumber also looks slug-like and is sometimes loosely called a sea slug, but it is not a gastropod. Sea slug is a common name which is applied to some marine invertebrates that more or less resemble terrestrial slugs.
Medical Definition of VERTEBRA. : any of the bony or cartilaginous segments that make up the spinal column and that have a short more or less cylindrical body whose ends articulate by pads of elastic or cartilaginous tissue with those of adjacent vertebrae and a bony arch that encloses the spinal cord.ord Root of VERTEBRA. The Latin word vertere, meaning â to turn â or â to change, â and its form versus give us the roots vert and vers. Words from the Latin vertere have something to do with turning or changing.
Cervical Vertebrae Definition. The cervical vertebrae are the seven cylindrical bones, or vertebral bodies (C1-C7), that provide support and structure for the cervical spine. Cervical Spine Anatomy Video. The vertebral body is the large portion of the bone that lies anterior (in front of) the spinal cord.The vertebrae get smaller as they near the base of the skull and only the top two segments allow for rotation in the neck.The top cervical segment, called the atlas, is a ring that does not have a vertebral body.he atlas is attached to the second vertebral body (the axis), which acts as a post that the first vertebral ring rotates around. The segments in the cervical spine contain openings in each vertebral body for arteries to carry blood to the brain(vertebral foramen).