Structure present above the thalamus

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Epithalamus - The Structure Above the Thalamus

The structure present above (dorsal to) the thalamus is the Epithalamus.

Position Within the Diencephalon

The diencephalon is divided into four regions based on their position relative to the third ventricle:

Region	Position relative to thalamus
Epithalamus	Dorsal (above)
Thalamus	Central / lateral walls
Subthalamus	Ventrolateral
Hypothalamus	Ventral (below)

The diagram below from embryology clearly illustrates this arrangement - note panel E (transverse section) showing the epithalamus dorsally, the thalamus laterally, and the hypothalamus ventrally:

Diencephalon cross-section showing epithalamus above thalamus

(The Developing Human: Clinically Oriented Embryology, Fig. 17.22E)

Components of the Epithalamus

The epithalamus consists of several small nuclei and structures:

Pineal gland (pineal body)
- An endocrine gland that secretes melatonin, which regulates circadian rhythms and sleep-wake cycles
- It projects posteriorly from the roof of the diencephalon
Habenula (habenular nuclei)
- A bilateral nuclear complex involved in limbic-motor integration
- Plays a role in regulating reward, aversion, and stress responses
- Connected to other limbic structures via the stria medullaris thalami
Parts of the pretectum
- Involved in the pupillary light reflex and other visual reflexes
Posterior commissure
- A white matter bundle crossing the midline just above the pineal gland

Development

Embryologically, the epithalamus develops from the roof and dorsal portion of the lateral wall of the diencephalon. The thalamus is separated from the epithalamus by the epithalamic sulcus (visible in panel E of the figure above).

In a nutshell: The structure above the thalamus is the epithalamus, part of the diencephalon, consisting mainly of the pineal gland, habenular nuclei, and parts of the pretectum.

Neuroanatomy through Clinical Cases, 3rd Ed., p. 306-307
The Developing Human: Clinically Oriented Embryology, p. 1059-1060

Show the sagital section brain having all the structures abive the mid brain

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Here are the best sagittal/schematic brain diagrams from the textbooks showing all structures above and around the midbrain:

Sagittal Brain - Structures Above the Midbrain

Diagram A - Major Brain Subdivisions (sagittal schematic)

Major brain subdivisions - Telencephalon, Diencephalon, Mesencephalon, Rhombencephalon

(Neuroscience: Exploring the Brain, 5th Ed. - Fig. 7.23A & C)

This shows the rostral-caudal arrangement:

Telencephalon (forebrain) - cerebral cortex + basal telencephalon
Diencephalon - thalamus region (above the midbrain)
Mesencephalon (midbrain) - the reference landmark (shown in red)
Below: Rhombencephalon (hindbrain) - pons, medulla, cerebellum
Ventricular system shown in panel C - lateral ventricles → 3rd ventricle → cerebral aqueduct → 4th ventricle

Diagram B - Detailed Structures in Each Division

Labelled brain structures - cortex, thalamus, hypothalamus, tectum, tegmentum, cerebellum, medulla, pons

(Neuroscience: Exploring the Brain, 5th Ed. - Fig. 7.23B)

Structures Above the Midbrain (Rostral to it)

Division	Structures
Telencephalon	Cerebral cortex, basal ganglia (caudate, putamen, globus pallidus), olfactory bulb, hippocampus, amygdala
Diencephalon	Thalamus, hypothalamus, epithalamus (pineal gland, habenula), subthalamus
Midbrain (reference)	Tectum (superior & inferior colliculi), tegmentum, cerebral aqueduct, cerebral peduncles

Diagram C - Embryological Sagittal View (with epithalamus)

Embryological sagittal section showing epithalamus, thalamus, hypothalamus, pineal gland

(The Developing Human: Clinically Oriented Embryology - Fig. 17.22)

Panels C and D clearly show the medial/sagittal view with the pineal gland, epithalamus, thalamus, hypothalamus, optic chiasm, and mammillary bodies labeled on the developing brain. Panel E (transverse) confirms the dorsal-ventral stacking: Epithalamus (top) → Thalamus (middle) → Hypothalamus (bottom).

Key takeaway: All structures above the midbrain belong to the diencephalon (thalamus, hypothalamus, epithalamus, subthalamus) and the telencephalon (cerebral cortex, basal ganglia, limbic structures). The midbrain (mesencephalon) sits at the junction, connecting the forebrain to the hindbrain, with the cerebral aqueduct running through it.

Neuroscience: Exploring the Brain, 5th Ed., pp. 628-630
The Developing Human: Clinically Oriented Embryology, pp. 1059-1060

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