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Thalamus
Related Subjects: |Medulla Oblongata |Midbrain |Pons |Caudate Nucleus |Putamen and Globus Pallidus |Cerebral Cortex |Internal Capsule |Cavernous sinus |Basal Ganglia |Brainstem Anatomy |Thalamic Anatomy |Caudate Nucleus
- 📍 Location: The thalamus lies in the diencephalon, above the brainstem and between the cerebral cortex and midbrain. It sits on either side of the third ventricle.
- 🏗️ Structure:
- Paired structure ➝ right and left thalami, one in each hemisphere.
- Made of multiple nuclei grouped as:
- Anterior group
- Medial group
- Lateral group (dorsal & ventral tiers)
- Intralaminar group
- Midline group
- Reticular nucleus
- ⚙️ Functions:
- Sensory relay: All sensory input (except smell) passes through thalamus to cortex.
- Motor integration: Links basal ganglia ↔ motor cortex.
- Consciousness & alertness: Regulates sleep–wake cycles and awareness.
- Memory & emotion: Limbic system connections influence affect and recall.
- 🩸 Blood Supply:
- Posterior cerebral artery (PCA): Main source.
- Thalamogeniculate arteries: Supply lateral geniculate body and lateral thalamus.
- Thalamoperforating arteries: Supply anterior thalamus.
- 🚨 Clinical Significance:
- Thalamic stroke: Sensory loss, motor weakness, cognitive/emotional changes.
- Thalamic pain syndrome (Dejerine–Roussy): Chronic post-stroke pain.
- Neurodegeneration: Thalamus affected in Parkinson’s, MS, and others ➝ varied neurological symptoms.
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