823982 diencephalon
Transcript of 823982 diencephalon
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DIENCEPHALON
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CEREBRUM Largest part of the
brain Situated in the
anterior and middle cranial fossa
Divided into two parts:
1. Telencephalon2. Diencephalon
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DiencephalonDiencephalon
Sits on top of the brain stem Enclosed by the cerebral
hemispheres Made of four parts:
Thalamus Hypothalamus Epithalamus Subthalamus
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DiencephalonDiencephalon
Consists of the 3rd ventricle and the structures that form its boundaries, most rostral part of the brainstem.
Ant.: Intervent. fora. Post.: where the 3rd
vent. Forms the cerebral aqueduct.
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CHARACTERISTICS OF THE MIDBRAIN-DIENCEPHALIC JUNCTION
Addition of several masses of neurons surrounding the rostral part of the post. and lat. Mesencephalon.
Medial and lateral geniculate body fiber. Cerebral aqueduct expands into 3rd vent. Sup. Colliculi replaced by pre-tectal region Fasc. Retroflexor – vertical fibers traversing
the medial portion of the red nucleus.
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Inferior surface of the Diencephalon Only exposed area to
the surface in the intact brain.
Hypothalamus and other structures:
Optic chiasma Infundibulum with the
tuber cinerium Mamillary body
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Superior surface of the Diencephalon Concealed by the
fornix : thick bundle of nerve fibers from the hippocampus of temp. lobe and arches posteriorly over the thalamus to join the mamillary body
Roof of 3rd vent.
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Lateral surface of the Dierncephalon
Bounded by the internal capsule
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Medial surface of the Diencephalon Superior part by the
medial surface of the thalamus
Inferior part by the hypothalamus
These 2 areas are separated by a shallow sulcus the Hypothalamic sulcus.
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Diencephalon
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Diencephalon
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Diencephalon
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Diencephalon: Thalamus “Gateway to cerebral cortex” Most sensory stimuli project
to the thalamus, which in turn projects to the cerebrum.
Thalamus also influences moods and activities associated with strong emotion.
(Two concepts: Sensory integration and Mood)
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Diencephalon:Thalamus Large ovoid mass of
gray matter forming a greater part of the Diencephalon.
Cell station to all main sensory system except the olfactory pathway.
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Diencephalon
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HYPOTHALAMUS
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HYPOTHALAMUS
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