In contrast to other reports [ 10, 11] which have identified ectodermal and mesodermal components as predominant structures of head and retrobulbar teratomas, in our case ectodermal and endodermal components were mostly identified.
Since important characters are not preserved in several specimens, eg. Tarwinia without preserved detailed structures of head and mouthparts [ 1, 13], P. tanlan without mouthparts and with only partial mid- and hind legs, more Mesozoic materials are needed to fine tune the proposed phylogeny.
To separate the errors due to the diffusion approximation, finite geometry, and curvature from the errors due to the layered structure of the head, we first treated the head as a homogeneous medium by setting equal the superficial and brain absorptions, i.e. μ a,superf = μ a,brain = [0.05,0.06,...,0.29,0.3]cm−1.
This phase includes three sub-phases: establishment of a grid-based virtual structure, election of head nodes in the virtual grid cells, and establishment of the neighbor tables.
Other structural features of taxonomic importance include location of the gonopores, structure of the head, and adaptations of the respiratory and excretory systems.
Phrenology, the study of the bony structure of the head, was based on the belief that character could be read from the skull's formation.
The class Insecta is divided into orders on the basis of the structure of the head, including eyes, mouthparts, and antennae; the thorax, including legs and wings; and the abdomen, including segmentation, spiracles, and appendages (cerci, styli, furcula).
A matching layer structure of polishing head was calculated and designed.
In neuroimaging of rhesus macaques, this complex field pattern is compounded by the heterogeneous structure of the head.
The structure of cavity head has a symmetrical three side configuration for uniform pumping of active medium.
