Chapter 14 Flashcards
major functions of spinal cord
provides structural/functional link between the brain and the rest of the body
sensory input is from where?
from the body
motor commands are from where?
from the brain
sensory input _____ the cord
ascends
motor commands ____ the cord
descend
spinal reflex properties
does not involve the brain; has a very fast reaction to a stimulus
(note: not all reflexes are spinal reflexes!)
what part of the neural tube does the spinal cord develop?
caudal end of the neural tube; “tail” end
what happens to the neural canal during spinal cord development?
becomes the central canal of the cord
sulcus limitans forms at what week of development?
6th week
sulcus limitans
horizontal grooves
where does the spinal cord extend from?
the medulla oblongata
where does the spinal cord travel through?
the vertebral canal
end of the spinal cord
conus medullaris
where can you find the conus medullaris? (in other words, where does the spinal cord end?)
around the L1 vertebra
roots of remaining spinal nerves that extend down from the conus medullaris; “horse tail”
cauda equina
4 sections of the cord
cervical, thoracic, lumbar, sacral
cervical enlargement
widened region of cord that provides neurons for upper limbs
lumbar enlargement
widened region of cord that provides neurons for lower limbs
review!!!
epineurium, perineurium, and endoneurium
epi - whole nerve
peri - fascicle
endo - each axon
how many cervical nerve pairs?
8
how many thoracic nerve pairs?
12
how many lumbar nerve pairs?
5
how many sacral nerve pairs?
5
how many coccygeal nerve pairs?
1
