Paddywhack

Paddywhack (also spelt Paddywack) or Nuchal ligament (Latin: Ligamentum nuchae), is a strong elastic ligament in the midline of the neck of sheep or cattle which relieves the animal of the weight of its head. It is pale yellow in colour. (The yellow colour is the elastin on the ligaments.) The name is derived from the corruption of paxwax (originally faxwax Old English hair + to grow).