Neuroanatomy of Peripheral Nerves - Mr. Kingsley Akpang Flashcards
Axons constitute of _______
Nerve Fibres
The bundles of nerve fibres are referred to as _______ in the CNS
Tracts
The bundles of nerve fibers are referred to as ______ in the PNS
Peripheral nerve
What are peripheral nerves ?
They are simply bundles of neurite processes found outside the CNS
_______ and _______ are responsible for the transmission of sensory and motor impulses to and from the CNS
Cranial nerve and Spinal nerve
Where is the myelinated and unmyelinated fibers found
In the peripheral nerves
The bundles of fibers are referred to as tracts in _______ system
The Central Nervous System (CNS)
Layers of the schawn cell forms _____
The myelin sheath
Unmyelinated fibers exist when ______
Single schwan cell encloses two multiple axons
Myelinated fibers exist when _______
Single axon encloses a single schawn cells
What is nerve degeneration
It is the series of destructive changes that occur when a nerve is crushed
What is regeneration
It is a proliferative chance that occurs after an injury to return it to normal
Degeneration occurs in _______ _______ and _________
Soma (cell body)
Proximal axon
Distal axon
Neuron degeneration occurs ____ hour after injury
Few hour
Regeneration starts in ______ week after the injury
In 2weeks
Highlight the types of degeneration
Anterograde degeneration
Retrograde degeneration
Transnational degeneration
______ refers to change in the proximal anxon and soma (cell body)
Retrograde degeneration
_______ refers to the change in distal axon
Antero grade degeneration
What are synapses?
They are site of junctions between neurons
Site of junction between neurons and muscles are called ______
Neuromuscular junction
