Wiktionary
Usage examples of "arrectores".
The movement is effected, as we know from Kölliker's interesting discovery, by the contraction of minute, unstriped, involuntary muscles,[17] often called arrectores pili, which are attached to the capsules of the separate hairs, feathers, &c.
The arrectores pili contract not only under the above emotions, but from the application of cold to the surface.
How can the contraction of the unstriped and involuntary arrectores pili have been coordinated with that of various voluntary muscles for the same special purpose?
If we could believe that the arrectores primordially had been voluntary muscles, and had since lost their stripes and become involuntary, the case would be comparatively simple.
We may admit that originally the arrectores pili were slightly acted on in a direct manner, under the influence of rage and terror, by the disturbance of the nervous system.