Gross anatomy of Thalamus ( Part 1 ) - Introduction and Relations | Animated Neuroanatomy

📌 𝐅𝐨𝐥𝐥𝐨𝐰 𝐨𝐧 𝐈𝐧𝐬𝐭𝐚𝐠𝐫𝐚𝐦:- / drgbhanuprakash
📌𝗝𝗼𝗶𝗻 𝗢𝘂𝗿 𝗧𝗲𝗹𝗲𝗴𝗿𝗮𝗺 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝗛𝗲𝗿𝗲:- t.me/bhanuprakashdr
📌𝗦𝘂𝗯𝘀𝗰𝗿𝗶𝗯𝗲 𝗧𝗼 𝗠𝘆 𝗠𝗮𝗶𝗹𝗶𝗻𝗴 𝗟𝗶𝘀𝘁:- linktr.ee/DrGBhanuprakash
Thalamus
Characteristics:
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Location: The thalamus is located in the dorsal part of the diencephalon, situated above the midbrain.
Function: It acts as the main relay center for ascending sensory information between subcortical structures and the cerebral cortex, except for the sense of smell.
Composition:
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The thalamus is divided into various nuclear groups and regions, each with distinct functions and connections:
Lateral Nuclear Group:
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Dorsal Subgroup: Includes the lateral dorsal thalamic nucleus involved in spatial learning and memory.
Posterior Subgroup: Consists of the pulvinar nucleus, which contributes to visual perception and regulation of visual attention.
Ventral Subgroup: Comprises the ventral anterior thalamic nucleus involved in planning movement, and the ventral lateral thalamic nucleus responsible for coordinating movement.
Anterior Nuclear Group:
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Contains the anterior thalamic nuclei, which receive input from the mammillary nucleus, hippocampus, and cingulate gyrus. It is involved in memory, spatial navigation, and learning, contributing to the limbic system.
Medial Nuclear Group:
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Includes the dorsomedial thalamic nucleus, which has connections to the temporal cortex, substantia nigra, amygdala, and prefrontal cortex. It plays a role in affect, behavior, and emotions.
Intralaminar Nuclei:
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The intralaminar thalamic nuclei have connections with the reticular formation, thalamic nuclei, trigeminal tract, spinothalamic tract, and cerebral cortex. They contribute to awareness and arousal.
Metathalamus:
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Consists of the lateral geniculate thalamic nucleus, which receives input from the retina and is involved in vision.
Also includes the medial geniculate thalamic nucleus, which receives input from the superior olive and inferior colliculus, contributing to the processing of auditory information.
Blood Supply:
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The blood supply to the thalamus primarily comes from branches of the posterior cerebral artery (P1 and P2 segments). The specific arteries supplying the thalamus include:
Posterior thalamosubthalamic paramedian arteries: Supply the ventral, intralaminar, and medial nuclear groups.
Thalamogeniculate arteries: Supply the ventral nuclear group of the thalamus and medial geniculate thalamic nucleus.
Posterior choroidal arteries: Supply the intralaminar nuclei, pulvinar, and medial and lateral geniculate nuclei.
Thalamic Stroke:
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Thalamic strokes can result in various symptoms depending on the affected blood supply and involved nuclei. These symptoms may include impaired learning, memory loss, visual disturbance, contralateral hemisensory loss, thalamic pain syndrome, and other neurological deficits.
Key Points:
The thalamus is located in the dorsal part of the diencephalon.
It acts as a relay center for sensory information except for olfaction.
The thalamus consists of distinct nuclear groups with specific functions and connections.
The blood supply to the thalamus is mainly derived from branches of the posterior cerebral artery.
Thalamic strokes can lead to various neurological symptoms depending on the affected arteries and nuclei.
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