Lecture 16- Sensory and Motor Tracts

sensory neurons

sensory neurons

Millions of _____________ are delivering information to the CNS all the time

motor neurons

Millions of ____________ are causing the body to respond in a variety of ways

tracts

Sensory and motor neurons travel by different _____ within the spinal cord

ascending

sensory tracts

descending

motor tracts

spinal cord, brain

All tracts involve the _________ and the __________

origin and destination

Naming a tract often involves its _________ and ___________

posterior column, spinothalamic tract, spinocerebellar tract

what are the 3 major sensory tracts?

gracile fasciculus

part of the posterior column, Transmits information to the cerebrum coming from areas inferior to T6

cuneate facciculus

part of the posterior column, Transmits information to the cerebrum coming from areas superior to T6

sensory homonculus

a sensory map located in the posterior column

first-order neurons

neurons that make up the dorsal root ganglion

second-order neurons

connect to first order neurons and end in the brainstem

third order neurons

connect second-order neurons to the cortex

Lateral spinothalamic tracts

Pain/temperature sensations

Anterior spinothalamic tracts

Crude touch and pressure sensations

proprioception

what is the function of the Spinocerebellar Tracts

somatic nervous system

Directs contraction of skeletal muscles

autonomic nervous system

Directs the activity of glands, smooth muscles, and cardiac muscle

the motor homunculus

A diagrammatic representation of control over the primary motor cortex

The Vestibulospinal Tracts

send information from the inner ear to monitor position of the head/vestibular nuclei respond by altering muscle tone, neck muscle contraction, and limbs for posture and balance

• posterior column

The fasciculus cuneatus and fasciculus gracilis are part of the _____.
• posterior column
• anterior column
• spinothalamic tract
• spinocerebellar tract

• second-order neuron

The cell body of which sensory neuron may be located in either the spinal cord or the brainstem?
• first-order neuron
• second-order neuron
• third-order neuron
• fourth-order neuron

The Tectospinal Tracts

send information to the head, neck, and upper limbs in response to bright lights and sudden movements and loud noises

The Medial Reticulospinal Tracts

send information to cause eye movements and activate respiratory muscles

The Rubrospinal Tracts

send information to the flexor and extensor muscles