Neural - Thalamus Development
|Embryology - 25 Nov 2020 Expand to Translate|
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Neural development is one of the earliest systems to begin and the last to be completed after birth. This development generates the most complex structure within the embryo and the long time period of development means in utero insult during pregnancy may have consequences to development of the nervous system.
The early central nervous system begins as a simple neural plate that folds to form a groove then tube, open initially at each end. Failure of these opening to close contributes a major class of neural abnormalities (neural tube defects).
Within the neural tube stem cells generate the 2 major classes of cells that make the majority of the nervous system : neurons and glia. Both these classes of cells differentiate into many different types generated with highly specialized functions and shapes. This section covers the establishment of neural populations, the inductive influences of surrounding tissues and the sequential generation of neurons establishing the layered structure seen in the brain and spinal cord.
- Neural development beginnings quite early, therefore also look at notes covering Week 3- neural tube and Week 4-early nervous system.
- Development of the neural crest and sensory systems (hearing/vision/smell) are only introduced in these notes and are covered in other notes sections.
Some Recent Findings
|More recent papers|
This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
Search term: Thalamus Embryology
<pubmed limit=5>Thalamus Embryology</pubmed>
Human Stage 22 brain.
The basal part of the telencephalon forms the basal ganglia, a solid mass. Posteromedially these basal ganglia are in contact with the diencephalon. The large masses in either side of the diencephalon form the thalami.
Brain lateral view 13, 15, and 19 weeks the developing thalamus is shown in yellow.
Neuralation begins at the trilaminar embryo with formation of the notochord and somites, both of which underly the ectoderm and do not contribute to the nervous system, but are involved with patterning its initial formation. The central portion of the ectoderm then forms the neural plate that folds to form the neural tube, that will eventually form the entire central nervous system.
- Early developmental sequence: Epiblast - Ectoderm - Neural Plate - Neural groove and Neural Crest - Neural Tube and Neural Crest
|Neural Tube||Primary Vesicles||Secondary Vesicles||Adult Structures|
|week 3||week 4||week 5||adult|
|prosencephalon (forebrain)||telencephalon||Rhinencephalon, Amygdala, hippocampus, cerebrum (cortex), hypothalamus, pituitary | Basal Ganglia, lateral ventricles|
|diencephalon||epithalamus, thalamus, Subthalamus, pineal, posterior commissure, pretectum, third ventricle|
|mesencephalon (midbrain)||mesencephalon||tectum, Cerebral peduncle, cerebral aqueduct, pons|
|myelencephalon||medulla oblongata, isthmus|
|spinal cord, pyramidal decussation, central canal|
Early Brain Vesicles
- Nakagawa Y. (2019). Development of the thalamus: From early patterning to regulation of cortical functions. Wiley Interdiscip Rev Dev Biol , 8, e345. PMID: 31034163 DOI.
- Murata Y & Colonnese MT. (2018). Thalamus Controls Development and Expression of Arousal States in Visual Cortex. J. Neurosci. , 38, 8772-8786. PMID: 30150360 DOI.
- Mattes B, Weber S, Peres J, Chen Q, Davidson G, Houart C & Scholpp S. (2012). Wnt3 and Wnt3a are required for induction of the mid-diencephalic organizer in the caudal forebrain. Neural Dev , 7, 12. PMID: 22475147 DOI.
- Pyrgaki C, Trainor P, Hadjantonakis AK & Niswander L. (2010). Dynamic imaging of mammalian neural tube closure. Dev. Biol. , 344, 941-7. PMID: 20558153 DOI.
- Huang H, Xue R, Zhang J, Ren T, Richards LJ, Yarowsky P, Miller MI & Mori S. (2009). Anatomical characterization of human fetal brain development with diffusion tensor magnetic resonance imaging. J. Neurosci. , 29, 4263-73. PMID: 19339620 DOI.
Saitsu H & Shiota K. (2008). Involvement of the axially condensed tail bud mesenchyme in normal and abnormal human posterior neural tube development. Congenit Anom (Kyoto) , 48, 1-6. PMID: 18230116 DOI.
|"Wnt4 expression in the thalamus is repressed by Shh from the ZLI we reveal an additional level of interaction between these two pathways and provide an example for the cross-regulation between patterning centres during forebrain regionalisation."|
Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.
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Cite this page: Hill, M.A. (2020, November 25) Embryology Neural - Thalamus Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Neural_-_Thalamus_Development
- © Dr Mark Hill 2020, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G