How is the flatworm nervous system more advanced than that of cnidarians?
Members of the phylum Platyhelminthes are considered more advanced than members of the phylum Cnidaria due to their number of germ layers and their nervous system. The members of phylum Platyhelminthes have three germ layers of tissue, compared to the two layers of the cnidarians.
How is the nervous system of the flatworm different from that of a human?
The nervous system of the flatworm has an organization different from the invertebrates describe above. It does have a nerve net, but these are connected by long nerve cords. These cords are connected to cerebral ganglia located in the head region. Generally, the flatworm avoids light.
Do chordates have a nervous system?
As chordates, vertebrates have the same common features: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. Vertebrates are the only chordates that have a brain as part of their central nervous system.
What controls the nervous system in sea stars?
The nervous system of a sea star is characterized by a nerve ring that surrounds its mouth and connects to each individual arm through a radial nerve. The muscles of each tube foot are stimulated by neurons connected to the radial and ring nerves. The neural network and its physical distribution in a sea star.
Do arthropods have a nervous system?
The central nervous system of arthropods is segmented and can be roughly divided into the brain, located in the head at the anterior end, and the ventral nerve cord spanning from the head to the caudal end, the abdomen (Figure 1).
What cells do arthropods have?
All arthropods have segmented bodies and possess jointed limbs at all or many of their body segments. An additional common feature of arthropods is their exoskeleton, made mainly of chitin and/ or sclerotin. As in a vertebrate, the nervous system of an arthropod consists of specialized cells, the neurons.
What organ systems do arthropods have?
The arthropod nervous system consists of a dorsal brain and a ventral, ganglionated longitudinal nerve cord (primitively paired) from which lateral nerves extend in each segment. The system is similar to that of annelid worms, from which arthropods may have evolved.
What are the major organ systems in arthropods?
In this section we will examine these characteristics in more detail. Then we will analyze the internal organ systems of arthropods, including their digestive system, circulatory system, respiratory system, and nervous system….The general body plan of arthropods is divided into three main regions:
- Head.
- Thorax.
- Abdomen.
Do grasshoppers have a nervous system?
The central nervous system (CNS) of the grasshopper consists of a brain and a set of segmental ganglia that together make up the ventral nerve cord. Each ventral nerve cord ganglion develops very similarly during early embryogenesis.
How does the grasshopper nervous system work?
The ventral nerve cord Grasshoppers are segmented animals, and each segment is controlled by its own ganglion. The ganglia do the “thinking” of the nervous system, while the job of the interganglionic connectives is to coordinate the segments, so that the various bits of the animal all act together.
What makes CNS?
The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.