somatic motor pathways and extra stuff for chapter 11 quiz

Two motor nuerons of the somatic motor pathways

• Upper motor nueron

• Lower motor nueron

Upper motor nueron location

CNS processing center

Function of upper motor Neuron

Synapses on the lower motor nueron which controls it and innervates a single motor unit in a skeltal muscle

Lower motor nueron location

brain stem or spinal cord

Function of lower motor nueron

Triggers a contraction in innervated muscle

Origin of concious somatic motor control

Primary motor complex

Pathway of the consious motor control

corticospinal tracts

Origin of subconcious motor control

Upper motor nuerons in the brain stem

Pathway of subconsious motor control

Extrapyramidal tracts

Corticospinal pathways function

Provides voluntary control over skeletal muscles

The majority of the cerebral cortex is:

Gray Matter

What is located in the postcentral gyrus of the parietal lobe

primary somatosensory cortex

The thalamus doesn’t receive information from

Smell

Todd was startled when the door slammed shut. What part of the brainstem is responsible for this reflex?

The midbrain

What portion of the brainstem blends with the spinal cord after passing through the foramen magnum?

The medulla

What type of fiber carries information from the frontal lobe of the right cerebral hemisphere

to the occipital lobe of the same cerebral hemisphere?

Association fibers

What part of the brain is responsible for cognition?

Cerebral cortex

In what dura mater fold is the superior sagittal sinus located?

Falx cerebri

An injury to the spinal cord is not possible below the:

second lumbar vertebra

What is situated inferior to the conus medullaris of the spinal cord?

cauda equina

Heidi sustained damage to her spinal cord in a car accident. She has no difficulty moving her arm, but has lost some sensation in her arm. What part of her spinal cord must have been injured?

Posterior horn of spinal gray matter

Detection of stimuli is a responsibility of the ________ while perception of the stimuli is a

responsibility of the ________.

CNS; PNS

While cell bodies of somatic motor neurons can be found in the _________ gray horns of the spinal cord, cell bodies of autonomic (visceral) motor neuron can be found in the

_____________ gray horns

anterior; lateral

An ipsilateral, intersegmental reflex that causes rapid withdrawal of a body part from a

painful stimulus is the

Flexor reflex

Where are the cell bodies of lower motor neurons located?

anterior horn of spinal gray matter