Posts tagged ‘Organ’

May 21, 2011


The amygdala [uh-mig-duh-luh] (Latin: ‘almond’) are almond-shaped groups of nuclei (clusters of neurons) located deep within the temporal lobes of the brain in complex vertebrates, including humans. Shown in research to perform a primary role in the processing and memory of emotional reactions, the amygdalae are considered part of the limbic system.

The amygdala sends impulses to the hypothalamus for activation of the sympathetic nervous system to trigger a fight or flight response, to the thalamic reticular nucleus for increased reflexes, to the nuclei of the trigeminal nerve and the facial nerve, and to the ventral tegmental area, locus coeruleus, and laterodorsal tegmental nucleus for activation of dopamine, norepinephrine and epinephrine (adrenalin).

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April 28, 2011

Bony Labyrinth

bony labyrinth

The receptors for the senses of equilibrium (vestibule) and hearing (cochlea) are housed within a collection of fluid filled tubes and chambers known as the membranous labyrinth, which is located within the bony labyrinth, a cavity in an an animal’s skull bones.