How Big is Russia Compared to Other Countries. Russia, also known as the Russian Federation is a country located in Northern Eurasia. This country occupies 17,075,200 square kilometers or 10,610,037 square miles of land easily making it the biggest country in the world. However this is a very basic measure that doesnât help us understand or describe how big Russia is compared to other countries, such as Canada, US or Australia.
Dorsal muscles of the head and trunk include the serratus  posterior, the serratus posterior superior, the splenius capitis,  the spinalis, the latissimus dorsi, the multifi â¦ dus, and the  sphincter ani internus.
The dorsal nerve cord is later modified in vertebrates into the central nervous system which is composed of the brain and spinal cord. Dorsal nerve cord is mainly found in subphylum Vertebrata. Dorsal means the back side, as opposed to Ventral which is the front side of an organism. In organisms with Bipedalism dorsal is the back and ventral is the front. In organisms which walk on four limbs the dorsal surface is the top (back) and the ventral surface is the bottom (belly).