Nerve fibres in eye muscle of rat

Nerve fibres in eye muscle of rat

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Caption: Fluorescence light micrograph of nerve fibres (white) in the iris muscle of a rat's eye, showing the envelopment of a blood vessel (running left to right) by nerve fibres. The section is prepared to show the noradrenaline content of the nerve fibres. Noradrenaline & its relative adrenaline (catecholamine hormones) are released by the medulla of the adrenal glands in response to acute physical & psychological stress; the released catecholamines act on adrenergic receptors throughout body, particularly in heart, lungs, blood vessels, and visceral & skeletal muscle. The adrenergic nerve fibres in the iris cause dilation of the pupil. Magnification: X 16 at 35mm size.

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Keywords: adrenaline, anatomy, animal body, blood vessel, catecholamine, contraction, eye, eye (a), fluorescence light micrograph, iris, nerve fibres, neurotransmitter, noradrenaline, sight, vision

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