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anka

Which of the following terms best describes a nerve injury in which structures within the perineum and endoneurial tubes are disrupted and regeneration is disorderly?

A. neurotmesis
B. neurapraxia
C. axonotmesis
D. axesis
E. dermatofibrosis

kalamazoo

Tak z glowy to dalbym B, ale zaraz poszukam.

kalamazoo

No nie do konca Embarassed

C

Seddon's classification is a scheme for describing nerve injury.

Neurapraxia -- pressure on the affected nerve with no loss of continuity.
Axonotmesis -- neural tube intact, but axons are disrupted. These nerves are likely to recovery.
Neurotmesis -- the neural tube is severed. These injuries are likely permanent without repair, and will likely only achieve partial recovery at best.

Axesis to chyba zmyslone pojecie.

anka

Qurcze... wg Lange to ma być A Confused

Neurapraxia involves loss of conduction across a damages segment. The axons are not disrupted, and wallerian degeneration does not occur. Recovery is spontaneous and complete. Axonotmesis involves axonal disruption and wallerian degeneration of the axon distal to the injury site. The Schwann cell sheath is not disrupted and serves as a guide for the regenerating axon. In neurotmesis, regeneration is disorderly, and reinnervation occurs at a speed of 1 mm per day. The more distal the injury, the better the result. Any injury greater thn this requires surgical repair.

Axesis faktycznie musieli zmyslić Confused

anka

wiesz może Kalamazoo co to jest wallerian degeneration?

kalamazoo

Wallerian Degenation:
If a nerve fiber is cut or crushed, the part distal to the injury (i.e. the part of the axon separated from the neuron's cell nucleus) will degenerate, in a process known as Wallerian degeneration.

The axons and surrounding myelin sheath are digested by macrophages and Schwann cells. The target tissue of the nerve (typically an innervated muscle) atrophies as a result.

The nerve fiber's neurolemma does not degenerate and remains as a hollow tube. Within 96 hours of the injury, the proximal end of the nerve fiber sends out sprouts towards those tubes and these sprouts are attracted by growth factors produced by Schwann cells in the tubes. If the separation is not too severe, the sprouts grow into the tubes and eventually reach and reinnervate the target tissue. If the sprouts cannot reach the tubes, surgical closing the gap between sprouts and tubes can help. This regeneration however happens only in peripheral nerves, not in the spinal cord.

A jakbys chciala wniknac bardzo gleboko to polecam Wink

[link widoczny dla zalogowanych]

To pytanie jest troche dwuznaczne. Wydawalo mi sie ze chodzi o uszkodzenie z zachowaniem ciaglosci perineurium/within/. Ale jesli 'disorderly' to faktycznie A. Confused

anka

Dzięki! Fajna ta strona Very Happy