Nervous system: subdivisions and their neurons
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What are the 2 ways to classify neurons?
Structure and Function
Origin and purpose for sensory (afferent) neurons
Origin: PNS Purpose: send info from sensory receptors in PNS to CNS
Origin and purpose for motor (efferent) neurons
Origin: CNS Purpose: Send info from CNS to effector motor muscle in the PNS
Origin and purpose for interneurons
Origin: Within CNS Purpose: link sensory and motor neurons
Where is the cell body for trunk and limb somatosensory neurons?
Cell body is in the dorsal root ganglion
Where is the cell body for facial somatosensory neurons?
Cell body is in the trigeminal ganglion in the brain stem
Which area of the cerebrum receives the somatosensory information?
Parietal lobe
What is the basic function of the motor system?
Generate movement
What is the basic function of the sensory system?
Sense the body and the environment
What are the 3 key subdivisions of the sensory SYSTEMS?
• somatosensory • vestibular • visual
What is the basic function of the somatosensory subdivision
detect sensations such as touch, proprioception, temperature, and nociception
What is the basic function of the vestibular subdivision?
Detect the position and movement of the head
What is the basic function of the visual subdivision?
See environment and surroundings
What are the 3 subdivisions of the sensory (afferent) NEURONS?
• primary • secondary • tertiary
What types of sensory (afferent) NEURONS comprise the somatosensory and vestibular SYSTEMS?
primary, secondary, and tertiary
What types of sensory NEURONS comprise the visual SYSTEM?
secondary and tertiary
Where does the cell body for upper motor neurons originate?
Cerebrum (brain)
Where does the cell body for lower motor neurons originate?
Brain stem or spinal cord
What muscles are innervated by brain stem LMN?
Muscles of the face
What muscles are innervated by spinal cord LMN?
Trunk and limb
How do axons of the LMN innervate muscle? I.e. what is the path of a LMN axon
Axons of the LMN leave CNS to enter PNS to activate muscle
What are the 3 key pathways of the motor system?
• corticobulbo spinal tract (CBST) • reticulo spinal tract (RST) • vestibulo spinal tract (VST)
What is the function of CBST?
Voluntary motor control - head and neck (CBT) and trunk and limbs (CST)
What is the function of RST and VST?
Postural motor control