Because refinement of auditory receptive fields could depend on narrowing of the axonal projections from excitatory thalamocortical inputs, the widened auditory tuning in XMAC could result from sprouting of auditory thalamocortical afferents after lesion of the inferior colliculi
. Our data suggest that excitatory input may play a role in constructing auditory properties during recovery from midbrain damage.
Results for IC-inoculated animals showed that PrPd strongly accumulated in a dense synaptic pattern associated with nonamyloid plaques in the striatum, several thalamic nuclei (Figure 2, panel E), the external cortex of the colliculi
, and the tegmental area.
To do this, axons in the fascicular portion of the 4th nerve first travel in a posterior direction (ie opposite to the location of the orbit) around the edge of the PAG to emerge from the brainstem further posteriorly behind the inferior colliculi
, having crossed the midline within the superior medullary velum, a thin sheet of tissue forming the superior border of the 4th ventricle between the upper pons and cerebellum.
Crippa et al.'s  data, along with our own experience, indicate that probabilistic fiber tracking can accurately identify known auditory pathways (e.g., from the inferior colliculi
via the medial geniculate nuclei to primary auditory cortex) if sufficiently constrained by the researcher based on prior knowledge.
It is a short, thick ligament that originates from a wide area between the anterior and posterior colliculi
. The strongest fibers insert on the medial surface of the talus, under the tail of the comma-shaped articular surface.
The face of the giant panda sign is produced as a result of high signal intensity in the tegmentum with preserved normal signal intensity in the red nuclei and lateral portion of the pars reticulata of the substantia nigra as well as hypointensity of the superior colliculi
Several small, pitted lesions with dark rims were noted in the neuropil of the thalami, superior colliculi
, and hippocampus.
The tectum is formed by the superior colliculi
which is related to the visual system and the inferior colliculi
which are part of the auditory system. The crus cerebri and the tegmentum, also known as the cerebral peduncles, are composed of the corticospinal and corticopontine descending motor tracts.
The omega1 subtype is located on the pars reticulata; the molecular layer of the cerebellar cortex; the Lamina IV fibers in the spinal cord; the ventral thalamic complex; the pons; the inferior colliculi
; and the globus pallidus.
This dissection, which follows the natural planes of the fetal and neonatal rat brain, includes the corpus striatum, hippocampal formation, and neocortex within the area designated as "forebrain." The region designated as "brainstem" includes the midbrain, colliculi
, pons, and medulla oblongata (but not cervical spinal cord), as well as the thalamus.
Because the colliculi
, unlike the cortex, have heavily monocular input, Posner and Rafal suggested that humans with left spatial neglect might recover contralesional orienting while wearing a right eye patch, thus decreasing input to the left colliculus.
Collothalamus: The set of dorsal thalamic nuclei that receive their predominant input via a relay through the midbrain roof, referred to as the colliculi