A scabbard
The plural of sheath is sheaths. As in "the knight sheaths his sword".
People collect medieval swords for a variety of reasons. One reason is for their uniqueness.
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In a typical neuron, sheaths of fatty tissue are called the Myelin sheath. The myelin sheath surrounds parts of the axon of a nerve cell which speeds up neurotransmitters.
A blacksmith is a person who creates objects (such as swords) from steel or iron by forging the metal.
Myelin sheaths are located around the nerve cells. In central as well as peripheral nervous system.
Yes, tendon sheaths do act as friction reducing structures within the body. Tendon sheaths generally are found in areas where the tendons are constantly under pressure do to motion.
swords
bursae are flattened fibrous sacs, while tendon sheaths are elongated fibrous sacs.
Yes there are people who are swordsmiths. Some very fine swords are made and they can be expensive for a really good handmade sword.