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Dictionary » S » Sheathe

Sheathe

sheathe

1. To put into a sheath, case, or scabbard; to inclose or cover with, or as with, a sheath or case. The leopard . . . Keeps the claws of his fore feet turned up from the ground, and sheathed in the skin of his toes. (Grew) 'T is in my breast she sheathes her dagger now. (Dryden)

2. To fit or furnish, as with a sheath.

3. To case or cover with something which protects, as thin boards, sheets of metal, and the like; as, to sheathe a ship with copper.

4. To obtund or blunt, as acrimonious substances, or sharp particles. To sheathe the sword, to make peace.

Origin: Sheathed; Sheating

Alternative forms: sheath.


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Re: The Physics of how the Myelin Sheath actually works.

Think of the myelin sheathe as a dense wrapping - this leaves a tiny space between the outside of the axon and the inside of the sheathe. Ions pumped into the space during the recovery phase are trapped there, right next to the membrane, ...

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by Nebulae
Tue Feb 26, 2008 8:18 am
 
Forum: Human Biology
Topic: The Physics of how the Myelin Sheath actually works.
Replies: 17
Views: 2986

Re: The Physics of how the Myelin Sheath actually works.

Think of the myelin sheathe as a dense wrapping - this leaves a tiny space between the outside of the axon and the inside of the sheathe. Ions pumped into the space during the recovery phase are trapped there, right next to the membrane, ...

See entire post
by Darby
Mon Feb 25, 2008 8:59 pm
 
Forum: Human Biology
Topic: The Physics of how the Myelin Sheath actually works.
Replies: 17
Views: 2986

The Physics of how the Myelin Sheath actually works.

Ahh, that makes a lot more sense now guys. Thanks for all the replies. Also, how does the sheathe confine the ions? Why is there higher potential energy?

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by Nebulae
Mon Feb 25, 2008 7:59 am
 
Forum: Human Biology
Topic: The Physics of how the Myelin Sheath actually works.
Replies: 17
Views: 2986

Re: The Physics of how the Myelin Sheath actually works.

I've always assumed that the sheathe confines the resting potential ions right next to the membrane, so when the gates open they flood through much faster (higher concentration leads to higher flux). The fact that the impulse travels faster ...

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by Darby
Sun Feb 24, 2008 10:01 pm
 
Forum: Human Biology
Topic: The Physics of how the Myelin Sheath actually works.
Replies: 17
Views: 2986


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