noun which may take the genitive case particle 'no'
dorsal; dorsal side
Anatomical term referring to the back side of a body or organ. Often used in medical or biological contexts. Contrasts with 腹側 (ventral).
See also: 腹側
背側の筋肉を鍛えるトレーニングをしています。
I'm doing exercises to strengthen the muscles on the dorsal side.
この魚の背側は青く、腹側は白い。
The dorsal side of this fish is blue, and the ventral side is white.