Nervous System Flashcards
connective tissue coverings that run continuously arount spinal cord and brain
meninges
3 layers in order
dura mater, arachnoid mater, pia mater
found in sub-arachnoid area
cerebral spinal fluid (CSF)
inflammation of the meninges, caused by infection (bacterial, viral, fungal), weakened immune system, life threatening, very young (teens-20s)
meningitus
symptoms of meningitus
flu symptoms, fever, light sensitivity, neck hurts/feels stiff, hemmoraging under the skin
spinal cord length
42-45 cm (16-18 in)
how many spinal segments give rise to how many pairs of spinal nerves
31, 31
T/F the spinal cord runs the entire length of the vertebral column
false
where does the spinal cord run
foramen magnum to L2
what happens to the spinal cord after L2
it branches into couda aquina (horses tail)
T/F the spinal cord is not straight and narrow
true
what enlargements are on the spinal cord
cervical and lumbar
can you recover from a break of the vertabre that puts pressure on the spinal cord
yes
if a broken vertabre pierces the spinal cord, what does it cause
perminent paralysis
how do we divide the spinal cord
right and left halves
how is the anterior side of the spinal cord distinguished
the anterior fissure (deep groove)
how is the posterior side of the spinal cord distinguished
the posterior sulcus (shallow groove)
what are the “horns”
centrally located H-shaped mass of gray matter
what is in the central canal
CSF
3 different horns
anterior, posterior, and lateral
what types of neurons are in the spinal cord
association/intregrative (sensory) and motor neurons
what do ascending tracts do
take impulses to the brain (sensory neuron)
what do descending tracts do
take impulses away from the brain (motor neuron)
what does the spinal cord do?
conduct sensory and motor impulses to and from the brain from ascending and descending pathway
