Exam 3 Pathways And Integrative Function Flashcards
Sensation comes into the
Spinal cord and send motor outflow to muscles
The sensory information coming into the spinal cord is
Relayed by several neurons in series
The motor outflow from the _ descends into motor neurons in the _
Cerebrum (UMN), ventral horn of the spinal cord (LMN)
The white matter of the spinal cord can be divided into functionally distinct regions called
Funiculi
Motor pathways _ into funiculi of the spinal cord
Descend
Sensory pathways _ into the funiculi of the spinal cord
Ascend
In sensory pathways, what are the series to transmit information to the brain
First neuron is primary, second is secondary, and third is tertiary
What does the posterior funiculus-medial lemnisal pathway carry?
Sensation regarding precise touch and pressure from the skin
The thalamus relays…
Somatosensory information
The primary neurons are multipolar or unipolar
Unipolar
The first step of the posterior funiculus pathway….
- The primary neurons enter the spinal cord and ascend into the posterior funiculus
In the posterior funiculus medial Lemniscal pathway the primary neurons relay the info to
Secondary neurons in the medulla
In step 2 of the posterior funiculus medial pathway….
The axons of secondary neurons cross to the opposite side and ascend into the thalamus
A bundle of secondary neuron axons that cross over in the posterior funiculus medial pathway are called?
Medial lemniscus
Step 3 of the posterior funiculus medial pathway….
The tertiary neurons in thalamus receive info and send it to the primary somatosensory cortex (post central gyrus)
The primary somatosensory cortex is also known as the
Postcentral gyrus
If there is damage to the posterior funiculus medial pathway..
You lose precise touch and pressure for a certain spinal cord level and below.
Central processes in the posterior funiculus medial pathway….
Ascend into the posterior funiculus