1.2.5 Reflex and reflex arc

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From the course by Peking University

Advanced Neurobiology I

217 оценки

Peking University

Advanced Neurobiology I

217 оценки

Hello everyone! Welcome to advanced neurobiology! Neuroscience is a wonderful branch of science on how our brain perceives the external world, how our brain thinks, how our brain responds to the outside of the world, and how during disease or aging the neuronal connections deteriorate. We’re trying to understand the molecular, cellular nature and the circuitry arrangement of how nervous system works. Through this course, you'll have a comprehensive understanding of basic neuroanatomy, electral signal transduction, movement and several diseases in the nervous system. This advanced neurobiology course is composed of 2 parts (Advanced neurobiology I and Advanced neurobiology II, and the latter will be online later). They are related to each other on the content but separate on scoring and certification, so you can choose either or both. It’s recommended that you take them sequentially and it’s great if you’ve already acquired a basic understanding of biology. Thank you for joining us!

From the lesson

Anatomy of the Nervous System

Let's start with a basic introduction of neuroanatomy.

1.2.1 Brain stem9:30

1.2.2 Cranial nerves13:47

1.2.3 Ascending and descending tracts and reticular formation2:47

1.2.5 Reflex and reflex arc3:46

1.2.6 Concepts in the CNS and PNS2:32

1.2.7 Spinal cord8:14

1.2.8 The visceral nervous system12:04

1.2.9 Several pathways of the nervous system5:27

Meet the Instructors

Yan Zhang
Professor
School of Life Sciences, Peking University
Yulong Li
Research Fellow
School of Life Sciences, Peking University

As we mentioned, we have our central nervous system

as well as our peripheral nervous system.

The central nervous system, as we just went through,

we have brain and in the brain, we have telencephalon.

We have diencephalon, cerebellum, brain stems.

We just study the full details of the brain stems.

This lecture it contains midbrain, pons, and medulla.

Also, we have in the CNS system, we have the spinal cord.

Peripheral system, we have several nerves.

We have cranial nerves, 12 pairs and

we have 31 pairs of spinal nerves.

Also, we have some nerves can sense or

sent the information of our visceral system, so

we have visceral sensory nerves and we have our visceral motor nerves.

And then the biggest system of these two system

is the symphatic parts and the parasymphathic part.

In our spinal chord system, there are two very important concepts.

One is the reflex and then the other is the reflex arc.

The reflex is a reaction of the organism by

the nervous system in response to a stimulus.

There is a stimulation applied to our muscle or

our body and then our nervous system will make

a response according to the stimulation.

Reflex arc, there five basic component in our reflex arc.

One is the receptor and the other is the sensory neuron.

The information from the sensory neuron will get into our CNS system and

from the CNS system, the CNS system will process the information,

the sensory information, will make a decision and

then the decision or response will send it back to the motor neuron.

And then the motor neuron will control the effector, sometimes it's our muscle.

For example, this reflex here, if we hit our

muscle or tendon here and then this [INAUDIBLE] or

this information will ascend into the spinal cord,

the sensory area by the sensory neuron.

And then the sensory neuron will make one relay here at the spinal cord.

And then the spinal cord will know this information and then make a decision,

what kind of things the muscle will do in response to this stimulation.

The information will send out through this blue line through this

red line here by the motor neuron

to the effector is the muscle in the leg, and

then will make the leg either contraction or other response.

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