Presentation on theme: "1/9/2015 Entry Task: What did you learn from our hand holding/impulse activity while you acted like neurons?"— Presentation transcript:
1/9/2015 Entry Task: What did you learn from our hand holding/impulse activity while you acted like neurons?
I can draw a neuron and label at least 5 different parts I can outline the differences in loss of sensation and motor function with CNS and PNS conditions
Directs functions of the human body 100 billion nerve cells throughout the body Telephone exchange between brain, spinal cord, and nerves Spinal cord is like the switching center Nerves are cables for carrying messages to and from the centers Nerve cells = Neurons (highly specialized) EXCITEABILITY (ability to respond to a stimulus) CONDUCTIVITY (ability to transmit a signal)
Cell Body Dendrites Thin branching extensions off the cell body Conduct nerve impulses TOWARD cell body Axon Conducts nerve impulses AWAY from cell body Myelin Sheath Fatty tissue covering axon that speeds up impulse
Neurolemma Tubes that cover axon and contain myelin sheath Multiple neurolemmas cover one axon Axon Terminals Where impulse leaves neuron Nerve impulse then jumps from one neuron to the next over a space called a synapse Stimulated to jump by neurotransmitter
Afferent (sensory) neurons Carry information from sensory receptors TO the CNS Efferent (motor) neurons Carry information to the muscles and glands FROM the CNS Interneurons Carry and process sensory information within the spinal cord Reflexes! What happens if there is a C5 fracture that severs the spinal cord? L4?
Central Nervous System Peripheral Nervous System
Parts of the brain Neuron Afferent and efferent Paralysis, stroke (varying severities, but for this class: complete; black and white) Both are CNS injuries. Follow dermatome and myotome patterns! CNS vs PNS Reaction vs reflex C5 biceps C6 BR