Unit 2 Flashcards
What can the CNS be split into?
- Brain
- Spinal cord
What can the PNS be split into?
- Afferrent
- Efferent (Somatic and Autonomic)
What is a neuron?
Type of cell in the nervous system that is responsible for chemical signals.
- soma, dentrites, axon, axon terminal
What is a glia?
Type of cell in the nervous system that is responsible for support/structure
What are neurotransmitters?
Send signals from one neuron to the target cell
What is the cell body (soma)?
- It is the main organization center of the neuron
- Has the nucleus
What is a group of cell bodies called in the CNS and PNS?
CNS: nulcei
PNS: ganglia
What are dendrites?
Branch-like attachment of the cell body that captures signals form the outside environment and send it into the cell body.
What is an axon?
Part of the neuron that carries signals away from the cell body
What is the axon terminal?
The end of the axon that binds to target cell
What is the initial segment? (trigger zone)
The segment between the cell body and the axon. It is the integration center. The trigger zone activates ion channels to open and neurotransmitters to pass.
What is Myelin?
Myelin is able to create layers inside the neuron in order to act as an insulator
What are Schwann cells?
They are glial cells found in the PNS which have myelin that help insulate.
What is a node de ranvier?
Separate each Schwann cell from each other. Has a lot of NA+
What is an afferent neuron?
Neuron found outside the CNS that receives a signal and sends it to integration center.
