Skull Comparisons refers to a series of image macros that parody diagrams that compare skulls of the different stages of human evolution.
The twist is that they all look the same except one. Add your less evolved skull description to complete the meme. Click above to edit this template directly in your browser. Easily remix this template with your own text, images, and videos.
The final cranial bone is the sphenoid bone shown in light purple/pink below. It is the only cranial bone that articulates with all of the other cranial bones. The sphenoid bone is difficult to see on the side view of the skull, but it is actually shaped like a butterfly Let’s look at other slices of the skull to better understand the shape.
Diagram Skull Comparison Image Diagram - Chart - diagrams and charts with labels. This diagram depicts Diagram Skull Comparison Image
About Translations ) Carnegie stages are named after the famous US Institute which began collecting and classifying embryos in the early 1900’s. Stages are based on the external and/or internal morphological development of the embryo, and are not directly dependent on either age or size.
There are only two stage 3 embryos in the Carnegie collection. There are four characteristic processes that CS3 embryos go through cavitation, collapse and expansion, hatching, and discarding of cells. The initiation of cavitation indicates the start of CS3.
Carnegie stage 1 is the unicellular embryo. This stage is divided into three substages. Primordial embryo. All the genetic material necessary for a new individual, along with some redundant chromosomes, are present within a single plasmalemma. Penetration of the fertilising sperm allows the oocyte to resume meiosis and the polar body is extruded.
Carnegie Stages Species Comparison Image Diagram - Chart - diagrams and charts with labels. This diagram depicts Carnegie Stages Species Comparison Image