physio lab 4 (2).docx - Lab 4: Nervous Tissue, The Brain...

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Lab 4: Nervous Tissue, The Brain and Reaction ExperimentsAdvanced Anatomy & Physiology LabNia Grant2/24/20IntroductionThe purpose of this experiment was to view the histology of nervous tissue slides in order tobetter understand the functions and to correctly be able to identify the different brain views andparts of the brain. In addition, parts 3 and 4 of this experiment allowed us to to viewphysiological responses and reactions to different stimuli, such as noise or taps on particulartendons. Nervous tissue is one of the four main classes of tissue, along with epithelial,connective and muscular (“Nervous Tissue”). It is composed of neurons and neuroglia cells andfound in both the central and peripheral nervous systems. The sheep and human brain are verysimilar, one of the main differences between the two being size and proportion. There aredifferent views to examine the brain and be able to view different structures. Some of thesedifferent views include dorsal, which looks at the upper surface of the brain, ventral, which looksat the lower surface of the brain, lateral, which shows a side perspective and the sagittal view,which uses a longitudinal plane to divide the brain into left and right sections. The brain is part ofthe central nervous system and plays a major role in almost every body function. The brain hasmany different functions, some of which include processing sensory information, regulatingblood pressure and breathing and releasing hormones (Seladi). The brain is divided into threemain parts, the forebrain, midbrain and hindbrain. Different structures of the brain are found inthe different parts of the brain and all serve different purposes and functions. The patellar tendonis a ligament that attaches to the bottom of the knee cap, or patella, and to the top of theshinbone, or tibia. The patellar reflex is a simple reflex that causes the quadriceps muscle tocontract, this occurs when the patellar tendon is stretched (“Knee-Jerk Reflex”). A change thatelicits a response is a stimulus.A reflex is an involuntary or automatic programmed response toa sensory stimulus (Biopac). In the last portion of the experiment we tested reaction times to astimulus. The latent period or reaction time is defined as the interval between the stimulusdelivery and the response to the stimulus. The response time can change depending on thecircumstance or situation going on.Materials and MethodsMaterialsMicroscopeNervous tissue slidesSheep brainDissecting toolsReflex hammerLaptop with Biopac programHeadphones and reaction time setup
MethodsPart 1- HistologyCollect 3 nervous tissue slides and view under a microscope. Take pictures.

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