Cells and tissues of the NS Flashcards
CNS consists of
brain and spinal cord
PNS consists of
cranial and spinal nerves
what are the two divisions of the PNS?
sensory (afferent) division
motor (efferent) division
what are the two sections of the motor (efferent) division?
somatic motor
autonomic
what are the two parts of the autonomic NS?
sympathetic
parasympathetic
what are glial cells?
non-excitable supporting cells
axons
conduct nerve impulses (APs) toward synaptic terminals
myelin sheath
increases conduction speed in axons
myelin sheath is formed by ……… …….. in the PNS
shwann cells
myelin sheath is formed by ……….. in the CNS
oligodendrocytes
depending on the presence of the myelin sheath - neurons will be ….
myelinated or non-myelinated neurons
demyelination (the patchy scarring/loss of myelin sheath) is implicated in what disease?
multiple sclerosis
nerve conduction across the affected terminals is abnormal
myelination in the PNS is by
schwann cells
myelination in the CNS is by
oligodendrocytes
what is the blood brain barrier?
protective barrier that helps maintain stable environment for the brain and prevents harmful AAs and ions in the bloodstream entering the brain
what ventricles lie in the cerebral hemispheres?
lateral ventricles
what ventricle lies in the diencephalon?
3rd ventricle
where does the 4th ventricle lie?
hindbrain
between pons and medulla and cerebellum
the subdural space is between which 2 layers?
dura
arachnoid
what does the sub arachnoid space contain?
CSF
the sub arachnoid space is between which 2 layers?
arachnoid
pia
what order do the meningeal layers go in from spinal cord outwards?
P A D
pia, arachnoid, dura
what lies in the ventricles in the brain and between the pia and arachnoid mater?
CSF
