The cortex of the brain in the human embryo during the fourth month with special reference to the so-called 'papillae of Retzius' / by George L. Streeter.

  • Streeter, George Linius, 1873-1948.
Date:
[1907]
Catalogue details

Licence: In copyright

Credit: The cortex of the brain in the human embryo during the fourth month with special reference to the so-called 'papillae of Retzius' / by George L. Streeter. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    of that layer, but it was nothing that approched the fungiform arrange- ment seen in the Retzius papilbe. As can be seen in normal specimens at this time, the pyramidal layer is split by a line of scanty nuclei into a Fig. 3. Section from a well-preserved brain of a pig embryo. 11.5 cm. long. This section shows that normally, in the pig brain of this age, the pyramidal zone presents a uniformly smooth outer surface. This brain, while still warm, was preserved in a chrome-acetic mixture. Fig. 4. Section from a macerated brain of a pig embryo, 11.5 cm. long. The brain was kept in normal salt solution 48 hours and then preserved in formalin followed by Muller’s solution. The section shows distinct fungi- form clumping of the cortical cells and characteristic Retzius papillae. The same specimen is shown under higher power in Fig. 6. more superficial thicker subdivision, the pyramidal cells proper, and a deeper subdivision which is to form the layer of polygonal cells. Tins stratification was preserved in the experimental material. Another feature of importance was the absence of the so-called transitory fissures.