Why is the nerve cord of an earthworm ventral instead of dorsal?
The nerve cord of an earthworm is ventral because the nerve cord runs down the ventral, or belly, plane of the organism compared to a dorsal nerve cord, which would run down the dorsal, or back, plane of the organism.
The dorsal side of an earthworm is darker than the ventral side because of the dorsal blood vessal that runs along the top of the digestive track and just under the skin. There is a ventral blood vessal, but it doesn't lie against the skin, but instead in between the ventral nerve cord and the digestive track.
The dorsal side of an earthworm is darker than the ventral side. This is because of the dorsal blood vessal that runs along the top of the digestive track and just under the skin. There is a ventral blood vessel, but it doesn't lie against the skin, but instead in between the ventral nerve cord and the digestive track.
The earthorm has a closed circulatory system with five main blood vessels: Dorsal (above the digestive tract) - it moves blood forward The remaining four all move the blood to the rear of the earthworm: Ventral (beneath the digestive tract) Subneural Vessel (below the nerve cord) Right & Left Lateroneural vessels (either side of nerve cord)
The dorsal nerve cord is one of the embryonic features unique to chordates, along with a notochord, a post-anal tail and pharyngeal slits. It is a hollow cord dorsal to the notochord. It is formed from a part of the ectoderm that rolls, forming the hollow tube, compared to other animal phyla, which have solid, ventral tubes. The dorsal nerve cord is later modified into the brain and spinal cord. Dorsal nerve cord is mainly…
Yes, the ventral root of a spinal nerve is the efferent motor root, consists of axons of motor neurons. It joins the dorsal root to form a mixed spinal nerve, which consists of afferent sensory neurons (from the dorsal root) and efferent motor neurons (from the ventral root). Therefore severing the ventral root will result in a loss of motor function for the myotome supplied by that spinal nerve.
The ventral nerve cord makes up nearly all of the nervous system in the earthworm. It goes from the anterior (front) end to the posterior (back) end. It's function is simple; it's the nerves in the worm! If dissected, the nerve cord looks like a thin white line on the ventral (belly) side on the inside of the skin.
Where do the small nerves go when they branch from a ganglion of the ventral nerve cord on an earthworm?
While humans and other vertebrates have a spinal column that runs down their back, or dorsal side, earthworms possess a nerve cord consisting of two strands that runs down their belly, or ventral side. The nerve cord of an earthworm relays impulses from receptors in the worm's anterior to posterior parts of its body.
Why is it an advantage for they crayfish to have its nerve cord on the ventral side rather than on the dorsal side?
If the ventral root of a spinal nerve were cut what would be the result in the tissue or region that nerve supplies?
Cutting the ventral root of a spinal nerve will denervate all target organs that receive efferent innervation from that spinal nerve. Spinal nerves are made by the joining of dorsal and ventral roots of a spinal cord segment. Dorsal roots generally carry sensory information, while ventral roots generally carry motor innervation. Another way to say this is that dorsal roots carry information from the periphery to the central nervous system (CNS) in an afferent direction…
Like humans, A dorsal nerve cord would be present on the "back" of the person or chordate. Some invertebrates such as arthropods, have a ventral nerve cord on the "belly." This type of cord is usually made up of connected branches or a rope style chain instead of 1 solid cord that runs the length of the body. Therefore, the body would have a better range of movement, because of the ability to have several…
What parts of an earthworm serve as its brain and how are these parts connected to the rest of the body?
The anterior or ventral roots carry motor or efferent information from motoneurons in the anterior horn to muscles. This is as opposed to the dorsal roots that convey sensory or afferent informaiton from the periphery to the dorsal horns of the spinal cord. This is not to be confused with ventral rami that subserve intrinsic muscles of the back and neck. Therefore if a ventral root is severed or cut there would be a loss…
1) Why do nerve impulses need to travel faster in a Human than in an earthworm? 1) Why do nerve impulses need to travel faster in a Human than in an earthworm? 1) Why do nerve impulses need to travel faster in a Human than in an earthworm? 1) Why do nerve impulses need to travel faster in a Human than in an earthworm?