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See the crazy way octopus and cuttlefish get spiky

A new study clarifies an amazing defense tactic of octopus and cuttlefish: the ability to erect 3D spikes out of their skin, hold them for an hour, then quickly retract them and swim away.

New information about the neural and muscular mechanisms that underlie this extraordinary defense tactic appears in the journal iScience.

“The biggest surprise for us was to see that these skin spikes, called papillae, can hold their shape in the extended position for more than an hour, without neural signals controlling them,” says Paloma Gonzalez-Bellido, a lecturer in neuroscience at University of Cambridge and a former staff scientist at the University of Chicago’s Marine Biological Laboratory.

This sustained tension, the team found, arises from specialized musculature in papillae that is similar to the “catch” mechanism in clams and other bivalves.

“The catch mechanism allows a bivalve to snap its shell shut and keep it shut, should a predator come along and try to nudge it open,” says corresponding author Trevor Wardill, a research fellow at the University of Cambridge and a former staff scientist at the MBL. Rather than using energy to keep the shell shut, the tension is maintained by smooth muscles that fit like a lock-and-key, until a chemical signal (neurotransmitter) releases them. A similar mechanism may be at work in cuttlefish papillae, the scientists found.

Gonzalez-Bellido and Wardill began this study in 2013 in the laboratory of Roger Hanlon, an MBL senior scientist and the leading expert on cephalopod camouflage. Hanlon’s lab had been the first to describe the structure, function, and biomechanics of skin-morphing papillae in cuttlefish (Sepia officinalis), but their neurological control was unknown.

Hanlon suggested the team look for the “wiring” that controls papillae action in the cuttlefish. As reported here, they discovered a motor nerve dedicated exclusively to papillary and skin tension control that originates not in the brain, but in a peripheral nerve center called the stellate ganglion.

Surprisingly, they also found that the neural circuit for papillae action is remarkably similar to the neural circuit in squid that controls skin iridescence. Since cuttlefish don’t have tunable iridescence, and squid don’t have papillae, this finding raises interesting questions about the evolution and function of the neural circuit in different species.

“We hypothesize that the neural circuit for iridescence and for papillae control originates from a common ancestor to squid and cuttlefish, but we don’t know that yet. This is for future work,” Gonzalez-Bellido says.


“This research on neural control of flexible skin, combined with anatomical studies of the novel muscle groups that enable such shape-shifting skin, has applications for the development of new classes of soft materials that can be engineered for a wide array of uses in industry, society, and medicine,” Hanlon says.

Source: University of Chicago

The post See the crazy way octopus and cuttlefish get spiky appeared first on Futurity.

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The rise of the internet and byproducts like Kickstarter has facilitated a spread of ideas like never before, some fun, some world-changing and a whole lot that can only be described as weird. The realm of transport is a particularly good place to see oddball creations in action, and while the seven presented here might not be the most effective in getting you where you need to go, they would certainly turn some heads along the way.

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general design discussion • Re: Machines v. Humans

Well…A handmade boat will have more human spirit, but you will also need more spirit not crashing it into the rocks when storm hits.
You can also turn your attention to a superhuman god-like perfection, but that doesn’t mean you won’t drown.
Therefore you need experts that can integrate form, function and human interaction – the industrial designer.

general design discussion • Re: 3D printer for my home

What we are really all waiting for is desktop SLS machines with a decent build volume.

Meanwhile, the Prusa i3 is fantastic! It is fast and can work with many different materials including Filaflex. The quality is awesome.
I also recommend Wanhao, am still very happily running a 5s Mini.
The CR-10 is less reliable.

The most important thing is that you buy a trusted brand.
Check out the discussions on as well.