Saccule of a Salmon

This light micrograph shows the saccular and lagenar otolithic endorgans of the ear of a Pacific salmon. Anterior is to the right and dorsal to the top. The saccular chamber (S) and the lagenar chamber (L) are contiguous with one another. The anterior part of the eighth nerve, which innervates the saccule, is VIIIa. The utricle is seen as 'U'. Each of the otolithic endorgans contains a calcareous otolith (the saccular otolith is very apparent in the picture). The otolith closely contacts the sensory epithelium which can, in this picture, be seen outlined by the saccular branch of the eighth nerve. Picture taken by Dr. Jiakun Song.

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