The following image from NASA's Hubble Space Telescope shows the large design spiral NGC 3631, which is located about 53million light-years away in the direction of the constellation Ursa Major. The "arms" of the large design spiral seem to surround and enter the galactic core.
Access:
Compared with multi arm and flocculent spiral, large design spiral galaxies have obvious and definite spiral arms, and the latter has softer structural elements. The spiral arms of a large design Galaxy clearly extend many radians throughout the galaxy and can be seen over a considerable range of Galaxy radius.
A close examination of the large spiral arm of NGC 3631 reveals dark dust channels and bright star forming regions along the interior of the spiral arm. The formation of stars in the spiral is similar to the traffic jam on the interstate. Like cars on the highway, the slower moving material in the spiral disk forms a bottleneck that concentrates the star forming gas and dust in the inner part of its spiral arm. This traffic jam becomes so dense that it collapses under gravity to form new stars (bright blue and white seen here).
It is understood that this picture uses data collected from Hubble's third-generation wide area camera and advanced observation camera. Blue represents blue light of visible wavelength, and orange represents infrared light.