Chapter 16 & 17 - Nerve Tracts & Autonomic Nervous System Flashcards
Types of sensory & motor pathways?
Ascending and decsending.
What does the ascending pathway conduct?
Sensory impulses to brain.
What does the descending pathway conduct?
Motor impulses from brain.
Divisions of sensory and motor pathways based on complexity?
Sensory, somatic motor, and autonomic motor pathways.
Divisions of sensory pathway?
First order neuron, second order, and third order.
First order neuron function?
Sensory info to CNS.
Second order function?
Receives impulse from first; spinal cord or brain stem.
Third order function?
Carries signal from thalamus to cerebral cortex.
Divisions of somatic motor pathway?
Upper motor neuron and lower motor neuron.
Upper motor neuron location?
In CNS.
Lower motor neuron location?
From CNS to effector.
Divisions of autonomic pathways?
Upper motor neuron, preganglionic neuron, and postganglionic neuron.
Upper motor neuron location?
In CNS.
Preganglionic neuron location?
From CNS to peripheral ganglion.
Postganglionic neuron location?
From ganglion to effector.
What are the ascending pathways?
Posterior column pathway, spinothalamic pathway, and spinocerebellar pathway.
Where do the posterior column pathways cross?
In medulla.
Functions of posterior column pathway?
Receive sensory impulses from skin, muscles, tendons & ligaments.
What does the posterior column pathway detect?
Fine touch, pressure & body position.
Where do the spinothalamic pathways cross?
In spinal cord.
What are the tracts of the spinothalamic pathway?
Lateral tract and anterior tract.
Lateral tract senses?
Pain & pressure.
Anterior tract senses?
Crude touch & pressure.
What are the tracts of the spinocerebellar pathway?
Anterior tract and posterior tract.
Where does the anterior tract cross?
In spinal cord.
Where does the posterior tract cross?
IT DOES NOT CROSS.
What is the function of the spinocerebellar pathways?
Propriorception for fine coordination.
Do the spinocerebellar pathways synapse in thalamus?
No.
Spinocerebellar pathway characteristics?
Never make it to cortex and subconscious processing.
What are the descending pathways?
Corticospinal pathway, medial pathway, and lateral pathway.
What does the corticospinal pathway do?
Controls voluntary movements.
What do corticospinal pathways generally direct?
Upper motor neurons synapse onto lower motor neurons.
What are the tracts of the corticospinal pathway?
Corticobulbar tract, lateral corticospinal tracts, and anterior corticospinal tracts?
Is the corticobulbar tract motor cranial or motor spinal nerves?
Motor cranial nerves.
Is the corticospinal tract motor cranial or motor spinal nerves?
Motor spinal nerves.
Is the anterior corticospinal tract motor cranial or spinal nerves?
Motor spinal nerves.
Where does the lateral corticospinal tract cross?
In medulla.
Where does the anterior corticospinal tract cross?
IT DOES NOT CROSS.
Medial pathway function?
Stimulat & inhibit same lower motor neurons as corticospinal.
Medial pathway tracts?
Vestibulospinal tract, tectospinal tract, reticulospinal tract.