对于人类而言，视网膜由密集的光感棒体以及视椎体细胞组成。 棒体细胞在弱光条件下比椎体细胞更容易发挥作用，并且这些细胞也是在鲨鱼视网膜内发现的最常见的细胞类型。
Rods are able to function in much lower light than cones - and these were the most common cell types found in all of the sharks.
电镜观察到单核细胞内有微丝体、微棒状小体和空泡状发育期寄生物；
Under electron microscopy, microfilament bodies, microrhoptryand vacuolar parasitic organisms at developmental stage were observed in monocytes.
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