Motor neurons travel in the anterior root out of spinal cord c. Interneuron (association): located in between sensory & motor neurons; multipolar neuron; enhances communication between the two neurons vi. Myelinization a. Myelin: protective coating neuronal axons b. Neurofibril node: areas on an axon without myelin c. Saltatory conduction: electricity travels through axon by jumping from node to node (increases speed) d. Multiple sclerosis (MS): disease in which the myelin is destroyed vii. Nerve Structure a. Nerve i. Epineurium b. Fascicle i. Perineurium c. Neuron i. Endoneurium viii. Synapse: communication location between a neuron and another structure a. Neuron to muscle fiber b. Neuron to neuron c. Neuron to gland ix. Main Regions of the Brain a. Cerebrum i. Left & Right Hemisphere 1. 5 lobes a. Parietal b. Frontal c. Occipital d. Temporal e. Insula b. Diencephalon i. Made up of epithalamus, hypothalamus, and thalamus c. Brainstem i. Made up of midbrain (mesencephalon), pons, and medulla oblongata x. Cranial Meninges Superficial to Deep a. Cranium b. Epidural space c. Dura Mater i. Splits into: 1. Periosteal layer: stays attached to cranium 2. Meningeal layer: branches into “V” shape to form the venous sinus d. Subdural space e. Arachnoid Mater f. Subarachnoid space
i. Filled with CSF g. Pia Mater h. Brain xi. Ventricles a. Right & left lateral ventricles i. Location where CSF is produced b. Third ventricle c. Fourth ventricle xii. CSF is made by choroid plexus (ependymal cells) in lateral ventricles xiii. Cerebral Hemispheres a. Frontal: motor, personality, judgment b. Parietal: sensory perception, emotions c. Occipital: vision perception d.
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- Fall '19