Brain

Contralateral

reflex crosses an interneuron to a motor neuron on other side of brain

ipsilateral

reflex all on same side of brain

major descending tracts - cross in medulla oblongata

corticospinal - lateral and ant.
reticulospinal - lat. ant., medial
rubrospinal

major ascending tracts - cross in spinal cord

fasciculus gracilis,fasciculus cuneatus
spinothalamic - lat. and ant.
spinocerebellar - post. and ant.

CNS Neuroglial Cells

Astrocytes - blood brain barrier
Oligodendrocytes - myelinating
Microglia - phagocytic

astrocyte

CNS neuroglial cell
mops up excess ions etc.
forms blood brain barrier
connects neurons/blood vessels

oligodendrocytes

myelinating cell in CNS

PNS Neuroglial cells

Schwann cells
Satellite cells

Schwann cells

produle myelin for peripheral myelinated neurons
only on axon

Satellite cells

support clusters of neuron cell bodies (ganglia)
only on cell body

Filum Terminale

extension of the pia mater
means "delicate mother"
anchors the spinal cord