Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Platyhelminthes - Nervous Systems
Among Platyhelminthes, you will observe that turbellarians have a brain and three to five pairs of longitudinal nerve cords extending from the brain to the posterior end. They are positioned along dorsal, lateral and ventral aspects. The cords are connected together through means of commissures. The commissures are in turn connected to a sub-muscular nerve plexus.
Figure: Planarian flatworms have a ladder-type nervous system. Cerebral ganglia in the head region serve as a simple brain and, to some extent, control the rest of the nervous system.
So, the system is not only sunk deeper into the sub-muscular position, but it does not correspond to the real primitive plexus at all. The motor and association neurons are mainly confined to the brain and the cords all along their periphery surrounding the central neuropile. One pair of these longitudinal cords becomes conspicuous, the others tending to become weaker finally disappearing thus giving rise to the typical ladder such as nervous system. With the development of the central nervous system, movements become more co- ordinate. Parts of the animal can keep spontaneous movements and show co- ordination of responses in most species of this group, just only if it contains portion of the nerve cord. The brain appears to have started exerting a dominating affect in this group.
importance of biodevercity
Explain Procedure for Gram Staining of Bacterial Cultures? Now carry out the exercise following the steps enumerated herewith. 1. Prepare bacterial smear on a clean, non-gre
Q. What is the valve that separates the duodenum from the stomach called? What is its function? The valve that separates the stomach from the duodenum is the pylorus it has the
Process of Memory: There are three stages of memory Encoding process: It is the process of receiving sensory input and transforming it into a form or code, which can be stored.
Physiological Regeneration This type of regeneration is a regular physiological function including the continuous replacements of cells and tissues, and thus is indispensible
Q. Function of Adenosine in consciousness? The adenosine plays a major role in inducing sleep. Injections of adenosine promote sleep and decrease wakefulness. Conversely, adeno
PHYSIOLOGY OF EXCRETION - 1 . FORMATION OF UREA - It takes place in liver. (i) Deamination (ii) Ornithine cycle or urea cycle - Explained by H.
Define the Feeding and Nutritional Management of spinal trauma? The main objectives of nutritional management are to meet the nutritional needs of the initial acute phase and
Pharynx: Pharynx is a funnel shaped tube about 13cm long that starts at the internal nares and extends to the level of the cricoid cartilage. It lies posterior to the n
Explain Microbiological Apparatus and Equipments? It provides an orientation to the various basic equipments, i.e., instruments, tools, glassware and miscellaneous items used i
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd