Nervous system pt.2 Flashcards
The CNS communicates with peripheral body structures through
pathways
Pathways can either be _____ or ___
sensory (signals toward CNS) or motor (signals away from CNS)
Sensory pathways are also called
ascending pathways
Sensory pathways relay input from ____ to the ____
receptors to the brain
Sensory pathways use a series of ________ to transmit nerve signals from _____ to ____
2-3 neurons to transmit nerve signals from body to brain
Process stimuli received from receptors within skin, muscles and joints
Somatosensory pathways
Process stimuli from vicera
Viscrosensory pathways
What are the 3 somatosensory pathways
- Dorsal column-medial lemniscal pathway 2. Spinocerebellar pathway 3. Spinothalmic pathway
Which somatosensory pathway detects light touch
Dorsal column-medial lemniscal pathway
Which somatosensory pathway deals with muscle coordination
spinocerebellar pathway
Which somatosensory pathway deals with crude touch
Spinothalamic pathway
Motor pathways are also called
descending pathways
Motor pathways originate from what 3 places
- Cerebral cortex 2. Cerebral nuclei 3. Brainstem
What are the primary effectors of motor pathways
Skeletal muscle
Motor pathways involve a ________ leading from brain to muscle
2- neuron chain
What is an example of a motor pathway
Corticospinal tract
What motor pathway is responsible for most voluntary muscle movement
Corticospinal tract
Involuntary, preprogrammed, rapid responses to specific stimuli
Reflex
Awareness of a reflex occurs
after the action is complete
What are the 5 classifications of reflexes
- Spinal vs. Cranial 2. Somatic vs. Visceral 3. Monosynaptic vs. Polysynaptic 4. Ipsilateral vs. contralateral 5. Innate vs. Acquired
Ipsilateral
same side
contralateral
different sides
What are the 5 components of a reflex arc
- Receptor 2. Sensory neuron 3. Interneuron 4. Motor neuron 5. Effector
What type of reflex involves movement in response to a painful stimulus
Withdrawal reflex
What type of reflex is the withdrawal reflex
Spinal, somatic, ipsilateral reflex
What type of reflex often happens in conjunction with withdrawal reflex
crossed-extensor reflex