Abstract
The optic nerve of the pig was investigated experimentally with A ‐ and B‐scans in plain water, and surrounded by the retrobulbar tissues and muscles. The effects of some tissues upon the nerve were also studied. In homogeneous medium substance, i. e. water, the optic nerve was acoustically heterogeneous in both A‐ and B‐scan. In B‐scan the centre of the optic nerve was acoustically homogeneous when surrounded by retrobulbar tissues and muscles, while in A‐scan the optic nerve was acoustically heterogeneous. The position, direction and anatomical structure of the optic nerve, as well as the fact that the change in acoustic impedance is only slight between the optic nerve and the surrounding tissues may be some of the reasons why the optic nerve appears as an acoustically empty space in clinical B‐scan examination.
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