Lecture 11: nerves and spinal cord Flashcards
wat doe stee CNS consist of?
brain and spinal cord
where is the spinal cord located?
spinal cord extends down the back of the body and distributes spinal nerves throughout the body
where do some invertebrates have their nerve cord?
ventral side
what do spinal nerves contain?
contain nerve fibres going to and from certain regions of the body
where do afferent nerves enter from?
Afferent (sensory) nerves enter via the dorsal root
How do effect nerves exit?
Efferent (motor) nerves exit via the ventral root
what does white matter contain?
nerve fibres and cell bodies of neurones.
where are motor nerve cells found?
central gray matter
where are sensory nerve cells found?
dorsal root ganglia
what do the layers covering the spinal chord do?
help protect and provide nutrition
what are the layers of the spinal cord?
dura, arachnoid, and pia matter
dura, arachnoid, and pia matter are made of what?
connective tissue
where is CSFS found ?
subbarachnoid space and spinal canal
what do vertical fibres communicate with?
brain
the spinal cord is _____.
segmented
in what way are the segments symmetrical?
bilaterally symmetrical
what is found in subarachnoid space?
blood vessels
what wraps around the roots?
Arachnoid
what does the left side consist of?
white columns, nerves, organised into tracts called posterior, anterior and lateral funiculus. .
what does the right side consist of?
grey matter, Grey commissure is the bridge between one side to the other.
the dorsal horn is what?
sensory
The spinal cord goes ______ as its going down the body
thinner
why is L2 wider than L1?
L2 is wider then L1 because there’s a sudden influx of nerves because of the legs and arm nerves
discuss motor cortex signals
Motor cortex sends signals down to the spinal cord through spinal tracts called upper motor neurons, which will communicate with lower motor neurons.
what does glia provide to nerve cells?
Glia provides a physical and nutritive framework to support nerve cells
what do oligodendrocytes in terms of repair?
inhibit repair
what do Schwann Cells in terms of repair?
promote repair
can neurones be replaced in humans?
no
what happens at the CNS and PNS border?
The Oligodendrocytes and Schwann cells swap
what collect on the CNS side or the border?
astrocytes.
Schwann cells end at the?
CNS-PNS border
____________ begin at the CNS-PNS border.
oligodendrocytes
