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EXPERIMENTAL OBSERVATIONS ON THE ECHOGRAMS OF THE OPTIC NERVE AND ON THE EFFECTS OF SOME TISSUES UPON THEM
Author(s) -
OKSALA ARVO,
HADIDI MOHAMMED ALI,
JÄÄSLAHTI SIRKKALIISA
Publication year - 1972
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1972.tb05959.x
Subject(s) - optic nerve , homogeneous , anatomy , chemistry , materials science , medicine , physics , thermodynamics
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.