Search results
Results from the WOW.Com Content Network
To do this, distinct ends of an organism are chosen, and the axis is named according to those directions. An organism that is symmetrical on both sides has three main axes that intersect at right angles. [3] An organism that is round or not symmetrical may have different axes. [3] Example axes are: The anteroposterior axis [8] The cephalocaudal ...
For example, blood can be said to flow in a proximal or distal direction, and anteroposterior, mediolateral, and inferosuperior axes are lines along which the body extends, like the X, Y, and Z axes of a Cartesian coordinate system. An axis can be projected to a corresponding plane.
The hypaxial muscle fibers of S. lacertina are obliquely oriented, but have a near zero mediolateral (φ) trajectory and a constant dorsolateral (α) trajectory within each segment. Therefore, the effect of dorsolateral (α) trajectory and the distance between a given hypaxial muscle layer and the neutral axis of bending (z) on muscle fiber ...
Convergent extension (CE), sometimes called convergence and extension (C&E), is the process by which the tissue of an embryo is restructured to converge (narrow) along one axis and extend (elongate) along a perpendicular axis by cellular movement.
An ellipse (red), its evolute (blue), and its medial axis (green). The symmetry set, a super-set of the medial axis, is the green and yellow curves. One bi-tangent circle is shown. (a) A simple 3d object. (b) Its medial axis transform. The colors represent the distance from the medial axis to the object's boundary.
Two parallel rows of domed scutes ran down the top of the neck, along the anteroposterior axis (front to back). On the upper surface of the back and tail, the skin was covered in small, bony nodules (ossicles), which separated larger conical scutes arranged in parallel rows along the mediolateral axis (side to side).
In anatomy, the axis (from Latin axis, "axle") is the second cervical vertebra (C2) of the spine, immediately inferior to the atlas, upon which the head rests. The spinal cord passes through the axis. The defining feature of the axis is its strong bony protrusion known as the dens, which rises from the superior aspect of the bone.
The axial twist theory (a.k.a. axial twist hypothesis) is a scientific theory that has been proposed to explain a range of unusual aspects of the body plan of vertebrates (including humans). [1] It states that the rostral part of the head is "turned around" regarding the rest of the body. [ 2 ]