### Some articles on *paraxial*:

**Paraxial**Mesoderm - Formation and Somitogenesis

... The

**paraxial**and other regions of the mesoderm are thought to be specified by bone morphogenetic proteins, or BMPs, along an axis spanning from the center to the sides of the body ... these pathways provide the initial specification of the

**paraxial**mesoderm and maintain this identity ... extends from the base of the head to the tail with it extend thick bands of

**paraxial**mesoderm ...

Somites and Their Derivatives

... mesoderm that is lateral to (at the side of) the neural tube is called

... mesoderm that is lateral to (at the side of) the neural tube is called

**paraxial**mesoderm ... The**paraxial**mesoderm is initially called the “segmental plate” in the chick embryo or the “unsegmented mesoderm” in other vertebrates ... (to eventually become the neural tube), the**paraxial**mesoderm separates into blocks called somites ...**Paraxial**Approximation

... In geometric optics, the

**paraxial**approximation is a small-angle approximation used in Gaussian optics and ray tracing of light through an optical system (such as a lens) ... A

**paraxial**ray is a ray which makes a small angle (θ) to the optical axis of the system, and lies close to the axis throughout the system ... (for θ in radians) for calculation of the ray's path and The

**paraxial**approximation is used in Gaussian optics and first-order raytracing ...

Helmholtz Equation -

... Further information Slowly varying envelope approximation The

**Paraxial**Approximation... Further information Slowly varying envelope approximation The

**paraxial**approximation of the Helmholtz equation is where is the transverse part of the Laplacian ... In the**paraxial**approximation, the complex magnitude of the electric field E becomes where A represents the complex-valued amplitude of the electric field, which modulates the sinusoidal plane ... The**paraxial**approximation places certain upper limits on the variation of the amplitude function A with respect to longitudinal distance z ...**Paraxial**Mesoderm - Derived Tissues - Head Mesoderm

... A particular kind of tissue deriving from the

**paraxial**mesoderm is the head mesoderm ... This tissue derives from the unsegmented

**paraxial**mesoderm and prechordal mesoderm ... The head mesoderm forms through a separate signaling circuit than the segmented

**paraxial**mesoderm, though also involving BMP and FGF signaling ...

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