The optic disc is a blind spot because no light receptor cells are present in this area of the retina where the optic nerve and retinal blood vessels leave the back of the eye.
视盘是个盲点，因为视网膜的这个区域没有光感细胞，视神经和视网膜血管从眼睛后面的这个部位伸出去。
2
In this image, stained retinal blood vessels are shown to emerge from the black-coloured optic disc.
这张照片显示的是血管从黑色视盘中伸出。
3
Result: After the tissue of intervertebral disc entered the epidural space, it would contact the blood system and be absorbed by the T-cell and monocytes in the blood system gradually.