(4) The columella, a structure which occupies the centre of the calicle, and may arise from the basal plate, when it is called essential, or may be formed by union of trabecular offsets of the septa, when it is called unessential.
- Colonial branching or palmate perforate corals, with abundant trabecular coenenchyme.
Values can be obtained for whole bones or joints, or bone cortex or trabecular bone alone.
The fluid drains back into the bloodstream through sieve-like channels called the trabecular meshwork.
Some conditions only affect the trabecular meshwork where the water in the eye drains out at the drainage gap.
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