SPLH 620 test 3 Questions Answered Correctly Latest Update 2025-2026
Spinal Motor Pathway - Answers Cerebral Cortex- through the internal capsule- decussates in
medulla- synapse in anterior horn of spinal cord
What is the lower motor neurons in the spinal motor pathway - Answers cell body in anterior
horn of spinal cord
internal capsule - Answers band of projection fibers that runs through the middle of the brain
bulbar motor pathway - Answers cerebral cortex- descends through internal capsule- synapse
on cranial nerve
bulbar motor pathway lower motor neurons - Answers cell body in cranial nerve nuclei
What is the Reticular Formation - Answers poorly-differentiated are of the brainstem mainly in
the pons that forms a diffuce, multisynaptic net-like meshwork of widely interconnected
neurons
What is the reticular formation invovled in - Answers -control of movement
-modulating transmission of info in pain pathways
-autonomic reflex circuitry: breathing, heart rate, blood pressure
-control of arousal and counsciousness
central pattern generator - Answers neural circuitry that is responsible for generating the
rhythmic pattern of a behavior such as walking
: excitatory-inhibitory circuit
spinal cord segments - Answers 32 segments
-8 cervical
-12 thoracic
-5 lumbar
-5 sacral
-1 coccygeal
Dorsal and ventral roots in the spinal cord do what? What are they called together? - Answers
dorsal= sensory
ventral= motor
, both= spinal nerve
-both afferent and efferent together
grey vs white matter - Answers Grey
- Unmyelinated nerve cell bodies
- Dendrites
- Axon terminals
White:
- Myelinated axons
- Contain very few cell bodies
horns vs funiculi - Answers grey matter= horns
white matter= collumns and funiculi
what neurons are involved in a reflex - Answers -sensory
-motor
-interneuron
motor units are called what else? What happens there - Answers neuromuscular junction
-synapse between motor neuron and muscle fiber
what makes up a motor unit - Answers -motor neuron
-muscle fiber
what activates a motor neuron? - Answers acetylcholine (ACh)
is ACh (acetylcholine) excitatory or inhibitory - Answers excitatory
Small motor unit characteristics - Answers -fine control
-low force
large motor unit characteristics - Answers -gross control
-high force
Spinal Motor Pathway - Answers Cerebral Cortex- through the internal capsule- decussates in
medulla- synapse in anterior horn of spinal cord
What is the lower motor neurons in the spinal motor pathway - Answers cell body in anterior
horn of spinal cord
internal capsule - Answers band of projection fibers that runs through the middle of the brain
bulbar motor pathway - Answers cerebral cortex- descends through internal capsule- synapse
on cranial nerve
bulbar motor pathway lower motor neurons - Answers cell body in cranial nerve nuclei
What is the Reticular Formation - Answers poorly-differentiated are of the brainstem mainly in
the pons that forms a diffuce, multisynaptic net-like meshwork of widely interconnected
neurons
What is the reticular formation invovled in - Answers -control of movement
-modulating transmission of info in pain pathways
-autonomic reflex circuitry: breathing, heart rate, blood pressure
-control of arousal and counsciousness
central pattern generator - Answers neural circuitry that is responsible for generating the
rhythmic pattern of a behavior such as walking
: excitatory-inhibitory circuit
spinal cord segments - Answers 32 segments
-8 cervical
-12 thoracic
-5 lumbar
-5 sacral
-1 coccygeal
Dorsal and ventral roots in the spinal cord do what? What are they called together? - Answers
dorsal= sensory
ventral= motor
, both= spinal nerve
-both afferent and efferent together
grey vs white matter - Answers Grey
- Unmyelinated nerve cell bodies
- Dendrites
- Axon terminals
White:
- Myelinated axons
- Contain very few cell bodies
horns vs funiculi - Answers grey matter= horns
white matter= collumns and funiculi
what neurons are involved in a reflex - Answers -sensory
-motor
-interneuron
motor units are called what else? What happens there - Answers neuromuscular junction
-synapse between motor neuron and muscle fiber
what makes up a motor unit - Answers -motor neuron
-muscle fiber
what activates a motor neuron? - Answers acetylcholine (ACh)
is ACh (acetylcholine) excitatory or inhibitory - Answers excitatory
Small motor unit characteristics - Answers -fine control
-low force
large motor unit characteristics - Answers -gross control
-high force
