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[26] [31] The mouth of an octopus, located underneath the arms, ... The ink sac of an octopus is located under the digestive gland. ... Aside from humans, ...
In humans (a deuterostome), the development proceeds differently. The buccopharyngeal membrane is created in the foregut and is perforated during the fourth week of human development, creating the primitive mouth, whereas the cloacal membrane is created in the hindgut and is perforated during the eighth week of human development, creating the ...
A typical radula comprises a number of bilaterally-symmetrical self-similar rows of teeth rooted in a radular membrane in the floor of their mouth cavity. Some species have teeth that bend with the membrane as it moves over the odontophore, whereas in other species, the teeth are firmly rooted in place, and the entire radular structure moves as one entity.
Cephalization is an evolutionary trend in animals that, over many generations, the special sense organs and nerve ganglia become concentrated towards the front of the body where the mouth is located, often producing an enlarged head. This is associated with the animal's movement direction and bilateral symmetry.
During gastrulation, deuterostome embryos' anus is given first by the blastopore while the mouth is formed secondarily, and vice versa for the protostomes In deuterostomes, the developing embryo's first opening, the blastopore , becomes the anus , while the gut eventually tunnels through the embryo until it reaches the other side, forming an ...
Researchers have identified an extinct vampire squid-like creature that is the first of its kind with 10 functional arms. The earliest known relative of octopuses and vampire squid has been named ...
The common octopus (Octopus vulgaris) is a mollusk belonging to the class Cephalopoda. Octopus vulgaris is one of the most studied of all octopus species, and also one of the most intelligent. It ranges from the eastern Atlantic, extends from the Mediterranean Sea and the southern coast of England , to the southern coast of South Africa.
In a typical mammalian body such as the human body, the external body orifices are: The nostrils, for breathing and the associated sense of smell; The mouth, for eating, drinking, breathing, and vocalizations such as speech; The ear canals, for the sense of hearing; The nasolacrimal ducts, to carry tears from the lacrimal sac into the nasal cavity