Annelida - Annelida species are most commonly known as ring worms and they can be found on land environments along with marine environments. They are somewhere in the middle of the amount of species per phylum as they can classify around 17,000 species. Their nervous system is mostly focused on their movement according to their surrounding. They move using Peristalsis, which in use is the rapid contraction and release of muscles that help these species propel forward. Species that belong to the phylum Annelida are able to survive despite being cut many times because each segment that they are made up of contains identical organs, which are the organs necessary for survival.
Leeches - The nervous system is organized into a head ganglion, 21 body ganglia and 7 fused tail ganglia. These ganglia form a chain that lies along the ventral part of the leech. The ganglia are joined by connectives that consists of two large lateral bundles of nerve fibers and a thin medial connective fiber. The entire nerve cord is enclosed in a network of vessels referred to as the ventral blood sinus. From each side of the body ganglion, a pair of nerve roots arise and branch to innervate segmental structures in that region. Each segmental ganglion contains about 400 nerve cell bodies
Earth Worms - The nervous system of the earthworm is "segmented" just like the rest of the body. The "brain" is located above the pharynx and is connected to the first ventral ganglion. The brain is important for movement because without a brain the earthworm would not know when to stop moving Each segmented ganglion gets sensory information from only a local region of its body and controls muscles only in this local region. Earthworms have touch, light, vibration and chemical receptors all along the entire body surface.
Proboscis worms - the strings lie inside the skin, yet in most they are deeper, inside the muscle layers. The centermost anxious framework is frequently red or pink on the grounds that it holds hemogoblin. This stores oxygen for topaction or when the creature encounters anoxia, for instance while tunneling in without oxygen residue. The midway apprehensive framework comprises of a mind and combined ventral nerve ropes that unite with the mind and run along the length of the figure. The mind is a ring of four ganglia, masses of nerve cells positioned adjust the rhynchocoel close its front end – while the brains of most protosome spineless creatures enclose the foregut.
Leeches - The nervous system is organized into a head ganglion, 21 body ganglia and 7 fused tail ganglia. These ganglia form a chain that lies along the ventral part of the leech. The ganglia are joined by connectives that consists of two large lateral bundles of nerve fibers and a thin medial connective fiber. The entire nerve cord is enclosed in a network of vessels referred to as the ventral blood sinus. From each side of the body ganglion, a pair of nerve roots arise and branch to innervate segmental structures in that region. Each segmental ganglion contains about 400 nerve cell bodies
Earth Worms - The nervous system of the earthworm is "segmented" just like the rest of the body. The "brain" is located above the pharynx and is connected to the first ventral ganglion. The brain is important for movement because without a brain the earthworm would not know when to stop moving Each segmented ganglion gets sensory information from only a local region of its body and controls muscles only in this local region. Earthworms have touch, light, vibration and chemical receptors all along the entire body surface.
Proboscis worms - the strings lie inside the skin, yet in most they are deeper, inside the muscle layers. The centermost anxious framework is frequently red or pink on the grounds that it holds hemogoblin. This stores oxygen for topaction or when the creature encounters anoxia, for instance while tunneling in without oxygen residue. The midway apprehensive framework comprises of a mind and combined ventral nerve ropes that unite with the mind and run along the length of the figure. The mind is a ring of four ganglia, masses of nerve cells positioned adjust the rhynchocoel close its front end – while the brains of most protosome spineless creatures enclose the foregut.