The Mammalian Nervous System (CNS and PNS)

The essence of the mammalian nervous system lies in its contribution to the general wellbeing and coordination of the body. Human beings tend to be the most notable beneficiary of this system because of the tasks that they have to accomplish daily. The peripheral nervous system (PNS) is known to control the volitional and non-volitional behaviours through the assistance of spinal and cranial nerves. In this category, the somatic and autonomic nervous system are involved by virtue of the zones that are covered. The CNS is known to control most functions of the body. Since the brain and the spinal cord are incorporated, it manipulates thoughts, body movement, and even the conceptualization of the external environment. Both the CNS and the PNS aid in ensuring that an organism can make a proper judgement based on the prevailing conditions. The CNS collects sensory input from different parts of the body and sends the appropriate signal or mode of action that should be undertaken at any given time.

Advantages of MRI

MRI has a number of benefits that individuals can accrue from its application. First, it tends to be almost free from any form of allergic reactions because its contrast agents are tolerated. Secondly, patient acceptability is high since it requires little time for preparation. Additionally, its non-invasive nature aids to this effect. Thirdly, it should be noted that an MR image does not require ionizing radiation unlike in other techniques. The fourth benefit is that MRI acquisitions can be programmed to aid in the encoding of physiological phenomena such as diffusion of water (when detecting stroke) and the velocity of the blood.

How Information is Collected using MRI (Diffusion Tensor Imaging)

Magnetic Resonance Imaging (MRI) is a medical test that is non-invasive that is used by physicians in the diagnosis of different medical conditions. The process incorporates a powerful magnetic field, and radio frequency pulses. Further, there is a computer that is used in the production of organ and tissue pictures. The images then aid in the evaluation of various body parts. An examination can then be done from a computer monitor. Diffusion tensor imaging involves the utilization of specific MRI sequences and software in the generation of images from the resultant data. It uses water molecules diffusion to improve the MR images contrast.

Advantages of PET and fMRI over MRI and CT Scans

FMRI is known to produce high-resolution images as compared to MRI. This aspect is aided by the type of technology that is used. PET's advantage lies on its ability to aid in the study of body functions through the application of biochemical functions (Oehr, Biersack& Coleman, 2004). Therefore, early detection of diseases can be attained. Further, it ought to be noted that fMRI is non-invasive and does not use X-rays as in the case of CT scans. People need to be careful about the choice that they make according to the intention of the physician.

Limitations of PET compared to FMRI

The first limitation of PET in comparison to fMRI is that its scans have a lower resolution as compared to FMRI. Therefore, a medical practitioner will have to struggle to figure out the fine details (Alavi& Lin, 2009).  Additionally, there is an element of cost that is also evident. PET scanning needs a special machine. Hence, it tends to be more expensive than FMRI. Several trials have to be conducted to get an appropriate scan. PET also need radioactive isotopes for everything to work. The use of this approach has been discovered to be unsafe.




Alavi, A., & Lin, E. (2009). PET and PET/CT: A clinical guide. New York: Thieme.

Oehr, P., Biersack, H.-J., & Coleman, R. E. (2004). PET and PET-CT in Oncology.

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