Despite the general plan of the external and internal structure and the presence of similarities with terrestrial mammals, especially with primates, humans have a number of significant differences.
The most important human difference is true upright posture.
As a result, the human skeleton has the following features:
- S-shaped spine with 4 sharp bends;
- wide pelvis;
- flat chest;
- arched foot;
- the thumb of the lower extremities is close to the rest.
In this case, the upper limbs are freed, which leads to their greater mobility.
The flexible brush performs a variety of high-precision movements.
The cerebral section of the skull prevails over the facial one. This is due to the large volume of the human brain compared to primates.
The complexly arranged human brain provides consciousness, abstract thinking, articulate speech, which are not inherent in other animals.
In connection with speech activity and the development of the muscles of the tongue, a person has a horseshoe-shaped lower jaw and a protruding chin.