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.
If neither you nor your spouse is covered by a retirement plan at work, your deduction is allowed in full. For contributions to a traditional IRA, the amount you can deduct may be limited if you or your spouse is covered by a retirement plan at work and your income exceeds certain levels.Roth IRA contributions arenât deductible.es, you can contribute to a traditional and/or Roth IRA even if you participate in an employer-sponsored retirement plan (including a SEP or SIMPLE IRA plan). See the discussion of IRA Contribution Limits.