The claustrum is a thin sheet of grey matter that is parallel to and below part of the cortex, as illustrated by images from Crick's paper here.    From Wordnik.com.  [Mind Hacks: Francis Crick has left the building] Reference

Rintherout’s precaution of leaving the door open when she went down to the fisher’s cottage, will probably acquit poor Juno of that aggravation of guilt which the lawyers call a claustrum fregit, and which makes the distinction between burglary and privately stealing.    From Wordnik.com.  [The Antiquary] Reference

Bethleem in Austrum duabus leucis habetur claustrum Sanctæ.    From Wordnik.com.  [The Voyages and Travels of Sir John Mandeville] Reference

Bethleem in Austrum duabus leucis habetur claustrum Sanct�.    From Wordnik.com.  [The Principal Navigations, Voyages, Traffiques and Discoveries of the English Nation] Reference

PDF of paper 'What is the function of the claustrum?' by Crick and Koch.    From Wordnik.com.  [Mind Hacks: Francis Crick has left the building] Reference

Written with his collaborator Christof Koch, it concerns a little known part of the brain called the claustrum.    From Wordnik.com.  [Mind Hacks: Francis Crick has left the building] Reference

The co-ordination of this distributed neural activity is something that Crick and Koch aim to explain in their paper, proposing that the claustrum may be the mesh that connects disparate brain areas.    From Wordnik.com.  [Mind Hacks: Francis Crick has left the building] Reference

Crick and Koch argue that the claustrum is probably connected to all of the cortex, and has a significant role in emotion, suggesting it may be involved in the 'binding' of emotion and the senses into a single conscious experience.    From Wordnik.com.  [Mind Hacks: Francis Crick has left the building] Reference

I think the most recent time was when activity in certain areas of my brain (the claustrum, left caudate and putamen, right middle occipital/middle temporal gyri and bilateral cingulate gyrus) caused me, quite against my will, to become attracted to Susan from Narnia Episode IV (who turns out to be 17, so it's OK anyway).    From Wordnik.com.  [You can'ta fool me] Reference

Studies in patients with fibromyalgia show that pain catastrophizing is associated with increased activity in brain areas related to anticipation of pain (medial frontal cortex, cerebellum), attention to pain (dorsal ACC, dorsolateral prefrontal cortex), emotional aspects of pain (claustrum, closely connected to amygdala) and motor control.    From Wordnik.com.  [Dr. Sharma’s Obesity Notes » Blog Archive » Pain Catastrophizing in Severe Obesity] Reference

De Bethleem in Austrum duabus leucis habetur claustrum Sanctæ Charitatis, ibidem suo tempore Abbatissæ.    From Wordnik.com.  [The Principal Navigations, Voyages, Traffiques and Discoveries of the English Nation — Volume 08 Asia, Part I] Reference

The claustrum (Figs. 742, 744) is a thin layer of gray substance, situated on the lateral surface of the external capsule.    From Wordnik.com.  [IX. Neurology. 4c. The Fore-brain or Prosencephalon] Reference

It is bounded laterally by a lamina of white substance called the external capsule, and lateral to this is a thin layer of gray substance termed the claustrum.    From Wordnik.com.  [IX. Neurology. 4c. The Fore-brain or Prosencephalon] Reference

The gray substance of the hemisphere is divided into: (1) that of the cerebral cortex, and (2) that of the caudate nucleus, the lentiform nucleus, the claustrum, and the nucleus amygdalæ.    From Wordnik.com.  [IX. Neurology. 4c. The Fore-brain or Prosencephalon] Reference

Similarly it was a common proverb in religious houses, which meets us as early as 1170, that claustrum sine armario est quasi castrum sine armamentario (a monastery without a library is like a fortress without an arsenal).    From Wordnik.com.  [The Catholic Encyclopedia, Volume 2: Assizes-Browne] Reference

"claustrum sine armario, quasi castrum sine armentario.".    From Wordnik.com.  [Bibliomania; or Book-Madness A Bibliographical Romance] Reference

The part of the brain that caught the two researchers’ interest is the claustrum, a thin sheet of grey matter that lies concealed beneath part of the cortex the outer covering of the brain that carries out the computations involved in seeing, hearing and language.    From Wordnik.com.  [Did Crick Find the Seat of the Soul? « Gerry Canavan] Reference

Image via a Google Image search for “claustrum.”.    From Wordnik.com.  [Did Crick Find the Seat of the Soul? « Gerry Canavan] Reference