Nerve

differences and the relationships of the isolated sciatic nerve in regards to the compound action potential and the neuromuscular junction stimulations of the Rana pipens gastrocnemius. A total of five exercises were used to identify the effects on the stimulation of the sciatic nerve and the gastrocnemius. A dissection for both labs were performed to isolate the nerve and to isolate the gastrocnemius. Both experiments used LabChart to perform various stimulations on the sciatic nerve and the gastrocnemius muscle to observe the level of intensity, contraction, and voltage threshold caused by different stimulation pulses. Introduction When a neuron produces an action potential it could be due to chemical…

Cranial Nerves [Your Name] [Mentor’s Name] [Course Code and Course Name] [The date] Cranial Nerves Introduction The cranial nerves are important nerves in our brain and they are located on the bottom surface of human brain. They are twelve pairs of nerves. Some of the cranial nerves are responsible to control body muscles, some of the cranial nerves are associated with the internal organs or glands such as human heart of lungs and some of the cranial nerves are responsible to take…

THE SEVENTH CRANIAL NERVE Testing the Function of the Facial Nerve VII Anatomy & Physiology 203 November 15, 2014 Introduction: The facial nerve is the seventh cranial nerve of the peripheral nervous system that is the chief motor nerve of the face. It exits the brainstem between the pons and the medulla. The primary motor function is the control of the muscles of facial expressions and conveys impulses of taste sensations from the anterior two-thirds of the tongue and…

of cranial nerve function is an important part of a neurological assessment (Department of Health Sciences, 2014). The brain has twelve main pairs of nerves, called cranial nerves. During a complete neurological assessment, most of the cranial nerves are evaluated to help determine the proper functioning of the brain (Neurological Examination, 2014). Each cranial nerve is paired and is present in each side of the brain. Cranial nerve I (Olfactory) is the sensory nerve of smell. Cranial nerve II…

A nerve cell is also called a motor neuron, which is made from a cell body, an axon and axon terminals. The cell body contains a nucleus and dendrites that receive the signals and send it down the axon that is covered in myelin sheath. The axon terminals are connected to the muscles creating a neuromuscular junction. This is where the signal is relayed to the muscle. There are two groups of motor neurons: upper and lower. Upper motor neurons are those found in the brain and lower motor neurons…

The principal effect that make people continue smoking is that the drug excites neural activity and speed body functions. In other words, it makes the body feel good every time he/she smokes because the drug (cigarettes) helps keep motivated the body and feel energetic throughout the year. That is why it is really difficult a person stops smoking. Although, at the same time the drug is killing nerve cells in the brain because it has strong toxins that it can damage the nerve cells and kill them.…

Polyradiculitis, otherwise known as a variant of Guillain-Barre Syndrome (GBS), is a very rare disease where the immune system attacks the spinal nerve roots. Fewer than 20,000 a year get this disease, and I was one of them. It was one day in the early April of 2001. I was a healthy three year old toddler that went from running around and climbing on furniture to not being able to walk. My mom started to notice that I wasn’t walking; but instead I was pulling myself across the floor. I also had…

executed. External electrical stimulation of the ulnar nerve activated large then small motor units, because large myelinated axons are activated at lower threshold stimulus currents than smaller ones. Thus one would observe summation of the action potentials as the stimulus is increased due to an increase in the frequency of the firing of action potentials across multiple motor units. This is exactly what was observed in the compound action potential recordings in Figure 2, which showed that…

separate functions and organs and also have their own fair share of problems. The muscular system composes of the tissues and organs that are used to exert a force, whether under voluntary or involuntary control. Muscles are composed of long, slender cells called fibers, and these fibers come in bundles with very few or countless amounts per bundle. Muscles move by either contracting or extending, which is directed by nerve impulses sent from the central nervous system. There are three main…

Planarians are triploblastic acoelomates, meaning they have three tissue layers, ectoderm, mesoderm, and endoderm (Newmark and Alvarado, 2001). Their epidermal layer that surrounds the planarian is ciliated on the ventral surface (Newmark and Alvarado, 2001). Underneath the epidermal layer and the basal lamina, followed by a complex wall musculature that surrounds the body. The complex wall muscle is composed of the circular diagonal and muscle fibers (Newmark and Alvarado, 2001). The nervous…