Summary
Relays signals between brain and body and manages simple reflexes independently.
In depth
It carries ascending sensory tracts and descending motor tracts, with 31 pairs of spinal nerves. Central pattern generators produce rhythmic walking movements. Injury level determines paralysis: cervical injuries can affect all four limbs.
The spinal cord gives rise to 31 pairs of nerves. It also coordinates locomotion patterns. Damage leads to loss of sensation and movement below the injury.
Key idea: the spinal cord is a relay and a processor.
The spinal cord is about 45 cm long, ending at L1 to L2 (the cauda equina below). Ascending tracts: dorsal columns (fine touch, proprioception), spinothalamic (pain, temperature). Descending tracts: corticospinal (voluntary movement, crossing at the medulla), reticulospinal and vestibulospinal (posture). Dermatomes map skin areas to spinal nerves, and myotomes the muscles. Central pattern generators produce rhythmic walking even without brain input, shown in cats with transected cords.
Injuries: complete transection causes paralysis (paraplegia or tetraplegia, depending on level) and loss of sensation, spinal shock initially, and problems with bladder and autonomic function. Brown-Sequard syndrome results from half-cord damage. Epidural stimulation has helped some paralysed patients stand and step.
Example: C3 to C5 injuries affect the diaphragm, via the phrenic nerve, so ventilator support may be needed.
Frequently asked questions
What is Spinal Cord Functions?
Relays signals between brain and body and manages simple reflexes independently.
Which area of biology covers Spinal Cord Functions, and how advanced is it?
Spinal Cord Functions is one of the 54 topics in Neuroscience. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Brain-Machine Interfaces, Sensory and Motor Neurons, Cerebellum and Motor Learning.
Can you give an example of Spinal Cord Functions?
Dorsal roots are sensory and ventral roots are motor (Bell-Magendie law).
What should I learn before Spinal Cord Functions?
Work through the Beginner topics in Neuroscience first, such as Nervous System, Neuron, Central and Peripheral Nervous Systems, then return to Spinal Cord Functions. Intermediate topics assume the Beginner vocabulary.
What topics are related to Spinal Cord Functions?
The closest topics to Spinal Cord Functions are Brain-Machine Interfaces, Sensory and Motor Neurons, Cerebellum and Motor Learning, Reflex Arc. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Spinal Cord Functions?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Spinal Cord Functions. To practise the whole of Neuroscience, use the Neuroscience quiz.
How is Spinal Cord Functions different from Brain-Machine Interfaces?
Spinal Cord Functions: Relays signals between brain and body and manages simple reflexes independently. Brain-Machine Interfaces: Devices that decode neural signals to control computers or prosthetics, restoring function after injury. Read both side by side and note what each one explains.
How should I study Spinal Cord Functions step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Brain-Machine Interfaces and explain the difference aloud. Finally, take the Neuroscience quiz and come back to this page for any question you miss.