IB Biology Topic C3.1.6 Input to the Spinal Cord and Cerebral Hemispheres Through Sensory Neurons Revision Notes (SL/HL)

IB Biology Topic C3.1.6 Input to the Spinal Cord and Cerebral Hemispheres Through Sensory Neurons Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Sensory Neurons Carry Input to the Spinal Cord and Brain for Rapid Responses

Touch a hot stove and you pull your hand away almost instantly.
That speed comes from sensory neurons, which carry information from receptors to the central nervous system.

Definition

Sensory neuron

Sensory neurons are specialized cells that transmit information from the environment to the central nervous system (CNS), enabling the body to respond to stimuli.

Sensory Neurons Turn a Stimulus Into an Impulse for the CNS

Detection: receptors in the skin, eyes, ears, and other organs detect changes such as temperature, light, sound, or pressure.
Transmission: the receptor generates a nerve impulse that travels along the axon toward the central nervous system.
Integration: the impulse enters the spinal cord or reaches the brain via cranial nerves, where it is processed into a response.

How the Cerebral Hemispheres Handle Conscious Sensation

The cerebral hemispheres contain specialised regions such as the visual cortex, auditory cortex, and somatosensory cortex.
Sensory neurons carry signals to these regions, where the brain interprets them and coordinates a conscious response.

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Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Sensory Neurons Carry Input to the Spinal Cord and Brain for Rapid Responses

Touch a hot stove and you pull your hand away almost instantly.
That speed comes from sensory neurons, which carry information from receptors to the central nervous system.

Definition

Sensory neuron

Sensory neurons are specialized cells that transmit information from the environment to the central nervous system (CNS), enabling the body to respond to stimuli.

Sensory Neurons Turn a Stimulus Into an Impulse for the CNS

Detection: receptors in the skin, eyes, ears, and other organs detect changes such as temperature, light, sound, or pressure.
Transmission: the receptor generates a nerve impulse that travels along the axon toward the central nervous system.
Integration: the impulse enters the spinal cord or reaches the brain via cranial nerves, where it is processed into a response.

How the Cerebral Hemispheres Handle Conscious Sensation

The cerebral hemispheres contain specialised regions such as the visual cortex, auditory cortex, and somatosensory cortex.
Sensory neurons carry signals to these regions, where the brain interprets them and coordinates a conscious response.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C3.1.6: Input to the Spinal Cord and Cerebral Hemispheres Through Sensory Neurons Notes

Sensory Neurons Carry Input to the Spinal Cord and Brain for Rapid Responses

Sensory Neurons Turn a Stimulus Into an Impulse for the CNS

How the Cerebral Hemispheres Handle Conscious Sensation

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Sensory Neurons Carry Input to the Spinal Cord and Brain for Rapid Responses

Sensory Neurons Turn a Stimulus Into an Impulse for the CNS

How the Cerebral Hemispheres Handle Conscious Sensation

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics