Like most other arthropods, insects have a relatively simple central nervous system with a
dorsal brain linked
to a ventral nerve cord that consists of paired segmental ganglia running along the ventral midline of the thorax and abdomen.
What animal has a ventral nerve cord?
Ventral nerve cords are found in some phyla of the bilaterians, particularly within the
nematodes, annelids and the arthropods
. VNCs are well-studied within insects, and they have been described in over 300 species covering all the major orders.
Do flatworms have a ventral nerve cord?
Flatworms of the phylum Platyhelminthes have both a central nervous system (CNS), made up of a small “brain” and
two nerve cords
, and a peripheral nervous system (PNS) containing a system of nerves that extend throughout the body.
What type of nervous system does the flatworm exhibit?
Flatworms have
a cephalized nervous system
that consists of head ganglion, usually attached to longitudinal nerve cords
Do leeches have a ventral nerve cord?
The leech CNS consists of
a ventral nerve cord
with a brain at each end (Fig. 1A). Each segment contains a single ganglion, which communicates with the adjacent anterior and posterior ganglia via three connectives (a pair of large lateral connectives and a smaller medial connective, known as Faivre’s Nerve).
Do bugs feel pain?
Over 15 years ago, researchers found that insects, and fruit flies in particular, feel something akin to acute pain called “nociception.” When they encounter extreme heat, cold or physically harmful stimuli, they react, much in the same way humans react to pain.
Is nerve cord and spinal 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.
Do flatworms have a muscular system?
The well-developed muscular system present in flatworms is comprised of a
subcuticular musculature
consisting of layers of circular, longitudinal, and diagonal muscles close to the epidermis, and a mesenchymal musculature consisting of dorsoventral, transverse, and longitudinal fibres passing through the mesenchyme.
Do sea anemones have a nervous system?
The sea anemone, a cnidarian
Do flatworms have a body?
Flatworms have no body cavity other than the gut
(and the smallest free-living forms may even lack that!) and lack an anus; the same pharyngeal opening both takes in food and expels waste.
Does annelida have ventral nerve cord?
Annelids and all the more complex invertebrates share another characteristic feature, a
ventral nerve cord
with a pair of ganglia (or a single fused ganglion) in each segment, and longitudinal axon bundles between ganglia in adjacent segments (Fig.
Do Earthworms feel pain?
But a team of Swedish researchers has uncovered evidence that
worms do indeed feel pain
, and that worms have developed a chemical system similar to that of human beings to protect themselves from it.
Does a leech have a brain?
The leech is not a slug. … The leeches that I have driven several hundred miles to encounter are freshwater, bloodsucking, multi-segmented annelid worms with 10 stomachs,
32 brains
, nine pairs of testicles, and several hundred teeth that leave a distinctive bite mark.
Do bugs feel love?
“Even insects express anger, terror,
jealousy and love
, by their stridulation.”
Do bugs fart?
“The most common gases in insect farts are hydrogen and methane, which are odorless,” Youngsteadt says. “Some insects may produce gases that would stink, but there wouldn’t be much to smell, given the tiny volumes of gas that we’re talking about.”
Do All Bugs Fart? Nope.
Do bugs feel pain when you squish them?
As far as entomologists are concerned, insects do not have pain receptors the way vertebrates do.
They don’t feel ‘pain’
, but may feel irritation and probably can sense if they are damaged. Even so, they certainly cannot suffer because they don’t have emotions.
