How does the location of the nerve cord of arthropods compare with that of vertebrates?

How does the location of the nerve cord of arthropods compare with that of vertebrates?

One of the major differences between arthropods and vertebrates is the position of the nerve cord. In arthropods, the neuronal cord is located ventrally, in vertebrates dorsally. But it seems like this is not such a big difference because ventral in arthropods seems to be equivalent to dorsal in vertebrates.

What type of nerve cord does a crayfish have?

ventral nerve cord
The ventral nerve cord of the crayfish has good longevity even when isolated; it has been utilized for neurophysiological experiments. The central nervous system of crayfish is ladder-like (Fig. 1). The anterior-most ganglion is called the cerebral ganglion.

Where is the nerve cord of an earthworm located?

Wigglyworld.org states that “The earthworm’s nervous system is controlled by its cerebral ganglion, which functions as a simple brain. The ventral nerve cord is attached to the ganglion in the anterior segments, and it runs through the length of the body.

What are the swollen portions of the nerve cord on a crayfish called?

A ganglionic swelling of the cord is found in each body segment, with the most anterior ganglion, the subpharyngeal ganglion, being the most prominent. Two to five pairs of lateral nerves leave each ganglion to innervate the body wall of that segment.

What is the location of the nerve cords in Sea Star?

The starfish nervous system comprises radial nerve cords located in each of the five arms and linked by a circumoral nerve ring located in the central disk region.

How is the location of the earthworm’s ventral nerve cord different from the location of your vertebrate spinal cord?

One interesting difference between the nervous systems of invertebrates and vertebrates is that the nerve cords of many invertebrates are located ventrally whereas the vertebrate spinal cords are located dorsally.

Why is it an advantage for the crayfish to have its nerve cord on the ventral side rather than on the dorsal side?

the ventral side is under the crayfish exoskeleton, as opposed to the dorsal side where the exoskeloten is, when attacked it would be from the dorsal side snaping it. it has a stomach that helps digest food.

What does the nerve cord do in an earthworm?

The earthworm’s ‘brain’. Earthworms have a simple nervous system. The cerebral ganglion is connected to a ventral nerve cord that runs the length of the body. Each segment is connected to this cord, allowing earthworms to move and respond to light, touch, chemicals, vibrations and more.

Is spinal cord and nerve cord same?

a single hollow tract of nervous tissue that constitutes the central nervous system of chordates and develops into the spinal cord and brain in vertebrates.

What is the location of the nerve cords in Sea Star flatworm octopus and human?

These cords are connected to cerebral ganglia located in the head region. The central nervous system has been described as “ladder-like” because of the nerves connecting the nerve cords. Flatworms have “auricles” that project from the side of the head.

Where is the ventral nerve cord located in a crayfish?

The ventral nerve cord extends along the belly of the crayfish and runs to the rear end of the body (to the telson). It also has small nerve clusters at the end of each segment (walking legs, swimmerets, etc.). Every segment is like semi-independent and provides motor nerve to the appendages.

How does the nervous system of a crayfish work?

Basically, the nervous system of the crayfish is not completely centralized. It means that even if the cerebral ganglia is disabled, some parts of the crayfish would still move and react in a purposeful way while responding to external stimuli. You can also read the article “Do Crabs, Crayfish or Shrimp Feel Pain?”.

Where are the organs of a crayfish located?

Basically, crayfish internal anatomy includes the following systems: the circulatory system, the respiratory system, the digestive system, the nervous system, and the reproductive system. The majority of the internal organs are located in the Cephalothorax of the crayfish (the so-called head-chest area).

How many pairs of legs does a crayfish have?

They have five pairs of walking legs including a large pincer, the cheliped (ped = foot). Subphylum Atelocerata (formerly Mandibulata) includes insects, centipedes (centi = 100), and millipedes (milli = 1000). Centipedes and millipedes don’t really have 100 or 1000 legs, but they do have lots.