The Nervous System V Review
Today’s Lesson Attendance & Housekeeping Review Workbook
Housekeeping “Quest” on Nervous System: Thursday March 16th
Study for Test Review the note packages I gave you Review pages 121-128 in the workbook Know the components of the CNS and their definitions Know the 3 parts of the brain and what they’re responsible for Know how to label the neuron (motor and sensory) Know how neurons send signals Know the pathway reflexes take Be able to identify stimulus, reaction and whether reaction is voluntary/involuntary
Review
Nervous System What is it? 2 components: The system that receives, processes, stores and transmits information that comes from various parts of the body and the external world. 2 components: The Central Nervous System (CNS) The Peripheral Nervous System (PNS)
The Brain The parts of the central nervous system located in the cranium
Parts of the Brain 3 main parts: Cerebrum Cerebellum Brain stem
Sensory & Motor Parts of the Cerebrum Frontal lobe: reasoning, speech, muscle control Parietal Lobe: sensing, feeling Occipital Lobe: vision Temporal Lobe: hearing, language
Nerve Cells Information is transmitted through nerve tissue which is made up of nerve cells Also called Neurons
What do motor neurons look like?
Sending a signal Travel from one neuron to another via neurotransmitters These are chemical substances secreted by the axon terminal that travel across the transmission zone between neurons to the next dendrite Transmission zone is called a synapse
Sending a signal Synapse Axon terminal Dendrite
Types of nerves From last class! There are three types of neurons: Sensory neurons Transmit information from the sensory receptors to the CNS Motor neurons Transmit impulses from CNS to the muscles in order to produce movement (voluntary or involuntary) Interneurons Neurons that form connections between other neurons Neither sensory nor motor
Reflex Pathway The sensory receptors pick up a stimulus and change it into electrical impulses. The sensory or afferent nerve carries the message to the CNS. The interneuron (found in the grey matter of the spinal cord) received the information and interprets it. It then sends out a response signal. The motor or efferent nerve transmits the signal to the muscles Muscles react This reaction can be voluntary or involuntary
Motor Neurons
What do motor neurons look like?
Sensory Neurons
Sensory Neuron dendrite Nerve Impulse
Remember: you can always come see me if you have questions Workbook Complete pages 121-128 in your workbook If you’re done: study for quest! Remember: you can always come see me if you have questions