Paper - Development of the interfore-brain commissures in the human embryo

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Streeter GL. The cortex of the brain in the human embryo during the fourth month with special reference to the so-called Papilla of Retzius (1907) Amer. J Anat.

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This historic 1907 paper by Streeter described central nervous system neural development. The "papilla of Retzius" was first described by Gustaf Retzius (1842–1919) in Das Menschenhirn. (1895) Stockholm, one of the first photographic atlases of the brain. Retzius was also a supporter of the "neuron theory" of Embryology History - Santiago Ramón y CajalRamón y Cajal.

See also: Triarhou LC. (2011). A review of Edward Flatau's 1894 Atlas of the Human Brain by the neurologist Sigmund Freud. Eur. Neurol. , 65, 10-5. PMID: 21109741 DOI.

Squier W & Jansen A. (2010). Abnormal development of the human cerebral cortex. J. Anat. , 217, 312-23. PMID: 20979584 DOI.

"The fetal cortex consists of a densely packed band of cells in which only the superficial marginal zone (layer 1) is readily distinguished. In fetuses of 16–24 weeks gestation it is not uncommon to see irregularity of the cells of layer 1 and 2 of the cortex with projections of layer 2 cells into the relatively acellular layer 1 or molecular layer (Fig. 1). These are called ‘Papillae of Retzius’ and are commonly seen in the absence of any other abnormality. "

  Streeter Links: George Streeter | 1905 Cranial and Spinal Nerves | 1906 Membranous Labyrinth | 1908 Peripheral Nervous System 10mm Human | 1908 Cranial Nerves 10mm Human | 1912 Nervous System | 1917 Scala Tympani Scala Vestibuli and Perioticular Cistern | 1917 Ear Cartilaginous Capsule | 1918 Otic Capsule | 1919 Filum Terminale | 1920 Presomite Embryo | 1920 Human Embryo Growth | 1921 Brain Vascular | 1938 Early Primate Stages | 1941 Macaque embryo | 1945 Stage 13-14 | 1948 Stages 15-18 | 1949 Cartilage and Bone | 1951 Stages 19-23 | Contributions to Embryology | Historic Embryology Papers | Carnegie Stages | Category:George Streeter George Linius Streeter (1873-1948)

Modern Notes:

Neural Links: ectoderm | neural | neural crest | ventricular | sensory | Stage 22 | gliogenesis | neural fetal | Medicine Lecture - Neural | Lecture - Ectoderm | Lecture - Neural Crest | Lab - Early Neural | neural abnormalities | folic acid | iodine deficiency | Fetal Alcohol Syndrome | neural postnatal | neural examination | Histology | Historic Neural | Category:Neural
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Development of the Interfore-brain Commissures in the Human Embryo

Embryology History George Streeter
George Linius Streeter (1873-1948)

By George L. Streeter. Wistar Institute of Anatomy, Philadelphia.

A morphological study of the corpus callosum and the commissure of the hippocampus, based on a series of wax-plate reconstructions of human embryos varying from 80 to 150 mm. in length. All three structures cross the median line in that portion of the brain wall developed from the lamina terminalis.

In 80 mm. embryos the corpus callosum consists of a round bundle of fibers lying directly on the commissure of the hippocampus, representing the condition found in non-placental animals. The succeeding growth consists in the lengthening of the fornix and caudal migration of the hippocampal commissure, the latter remaining in close relation to the caudal end of the corpus callosum, which in the meantime, by increase in number of fibers, has extended anterior to the anterior commissure and posterior so as to deck over the region of the third ventricle.

The formation of a cavity in the septum lucidum occurs in embryos of about 95 mm. The anterior or olfactory division of the anterior commissure does not enter the olfactory bulb, but is traced to the cortex dorsal to the bulb.

Cite this page: Hill, M.A. (2020, April 9) Embryology Paper - Development of the interfore-brain commissures in the human embryo. Retrieved from

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