Osteons are arranged in parallel to the long axis of the bone. The Haversian canals surround blood vessels and nerve cells throughout the bone and communicate withosteocytes in lacunae (spaces within the dense bone matrix that contain the living bone cells) through canaliculi.
Any donation to a political party, campaign, or action committee is not tax deductible. 1  According to the Internal Revenue Service, âYou cannot deduct contributions made to a political candidate, a campaign committee, or a newsletter fund. 2  Limits On Contributions To Political Campaigns.
Deductible Contribution. A contribution that one may place into an IRA, 401(k), or other retirement plan each year that can reduce one's taxable income by the same amount. That is, the deductible contribution is the portion of one's retirement contribution that is tax deductible. The IRS generally sets the limits on deductible contributions.