The diploe is the most porous, the softest, and most cavernous part. From Wordnik.com. [On Injuries Of The Head] Reference
The bone at the middle of the head is double, the hardest and most compact part being the upper portion, where it is connected with the skin, and the lowest, where it is connected with the meninx (dura mater); and from the uppermost and lowermost parts the bone gradually becomes softer and less compact, till you come to the diploe. From Wordnik.com. [On Injuries Of The Head] Reference
In many old skulls, however, the diploe is wanting altogether, and the two tables are amalgamated, and often very thin. From Wordnik.com. [A Manual of the Operations of Surgery For the Use of Senior Students, House Surgeons, and Junior Practitioners] Reference
The spongy middle plate must, like the diploe of the skull, have served to deaden the vibrations of a blow dealt from the outside. From Wordnik.com. [The Testimony of the Rocks or, Geology in Its Bearings on the Two Theologies, Natural and Revealed] Reference
The tough outer table is more difficult to cut than the softer and more vascular diploe, and the inner table is denser than either, but more brittle. From Wordnik.com. [A Manual of the Operations of Surgery For the Use of Senior Students, House Surgeons, and Junior Practitioners] Reference
The division of the diploe can be readily recognized by the ease with which the instrument penetrates its substance and the bloody detritus which escapes. From Wordnik.com. [An Epitome of Practical Surgery, for Field and Hospital.] Reference
(granulations) grows below, and it grows from the diploe of the bone, and from the sound portion, provided the upper table alone be in a state of necrosis. From Wordnik.com. [On Injuries Of The Head] Reference
In adults, it is found in flat bones (sternum, ribs, clavicle), bones of pelvis, diploe of skull bones, in vertebrae and in proximal epiphysis of femur and humerus. From Wordnik.com. [Recently Uploaded Slideshows] Reference
Classification as to Structure: a. Spongy - made up of bony processes called trabeculae giving it a porous appearance; found in the epiphysis and metaphysic of long bones, diploe of flat bones and in the medullary cavities b. From Wordnik.com. [Recently Uploaded Slideshows] Reference
Now retract the pyramid, lest it injure the dura-mater; continue the rotary motion, holding the instrument perpendicularly to the bone, withdrawing from time to time, to clean its teeth with the brush and to enable the Surgeon to sound the depth of the groove; -- and penetrate both the diploe and the internal table. From Wordnik.com. [An Epitome of Practical Surgery, for Field and Hospital.] Reference
Thus (1.) it may be performed through the uninjured cranium in the hope of evacuating an abscess of the diploe or dura mater, or of relieving pressure caused by suppuration in the brain itself, or by extravasation into the brain or membranes; or (2.) it may be required in cases of punctured and depressed fracture for the purpose of removing projecting corners of bone and allowing elevation of the depressed portions; or (3.) it is sometimes used to remove a circular portion of bone in cases of epilepsy in which pain or tenderness is felt at some limited portion of the cranium. From Wordnik.com. [A Manual of the Operations of Surgery For the Use of Senior Students, House Surgeons, and Junior Practitioners] Reference
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