thalamus consists of a large collection of relatively
distinct subdivisions or cellular clusters, or nuclei,
all aggregated deep within the telencephon. The thalamus
contains nuclei that receive sensory input from spinal
and brainstem circuits. It processes information from
visual, auditory, somatic sensory, taste, pain and thermal
modalities. The thalamus makes numerous interconnections
with different areas of the neocortex as well as with
other nuclei of the telencephalon. It receives most
of its downstream inputs from a variety of neuronal
clusters lying in the medulla and brainstem. The thalamus
relays and translates streams of impulses arriving from
all its inputs and regulates and transmits processed
information to different layers of the cerebral cortex.
thalamus lies above the hypothalamus with which it makes
some connections. The thalamus is symmetrically mirrored
on the two sides of the brain and the two thalamic groupings
abut along the midline. Some thalamic nuclei may interconnect
between homologous nuclei on the two sides
we display coronal sections stained for cell bodies.
These cross sections are arranged from front (rostral)
to back (caudal). The sequentially arranged sections
are to scanned as one does in reading lines of text
in a book.