Mindblown: a blog about philosophy.
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Spherical aberration
Aberration or distortion of an image due to rays entering the peripheral portion of a spherical mirror or lens being refracted differently from those closer to the center. Thus the peripheral rays are focused on the optical axis at a different point from the central rays.
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Longitudinal aberration
Deviation of a ray from the direction parallel to the optic axis.
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Lateral aberration
Deviation of a ray from the focus measured on a line perpendicular to the axis.
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Chromatic aberration
Unequal refraction of different wavelengths of light through a lens, producing a colored image.
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Abernethy’s fascia
A layer of areolar tissue separating the external iliac artery from the iliac fascia over the psoas muscle.
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Abducens oculi
Musculus rectus lateralis bulbi, the lateral rectus muscle, one of the extraocular muscles,
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Abdominal ring
The apertures in the abdominal wall. External inguinal or superficial: An interval in the aponeurosis of the external oblique muscle, just above and to the outer side of the crest of the pubic bone.
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Abdominal region
The abdomen and its external surface, divided into nine regions by four imaginary planes: two horizontal, one at the level of the ninth costal cartilage (or the lowest point of the costal arch) and the other at the level of the highest point of the iliac crest; two vertical, through the centers of the inguinal…
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Abdominal reflexes
Contraction of the muscles of the abdominal wall on stimulation of the overlying skin. Absence of these reflexes indicates damage to the pyramidal tract. The tightening of the abdominal muscles, triggered by gently running one’s fingernails along the corresponding side of the abdominal wall.
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Abdominal quadrants
Four parts or divisions of the abdomen determined by drawing imaginary vertical and horizontal lines through the umbilicus.
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