Schwann cell

Oligodendrocyte or Schwann cell

Dendrites

Axon hillock

Myelin sheath

Myelination by Schwann cells or olgiodendrocytes

Opening of Voltage-gated sodium channels

Leakage of potassium from the cell

Axonal insulation by Schwann cells

The relative refractory period

The membrane can produce another action potential however it does not reach full size

Voltage-gated Na+ channels recover from inactivated state to the closed state

The membrane can produce another action potential however only in response to a very strong stimulus

All voltage-gated Na+ channels are active

The membrane cannot produce another action potential

Nerves broadcast signals in the FM band

Nerve APs have a particular filter shape which can be modelled by amplification

Nerve APs are small in size and therefore can be filtered on the basis of size

Nerves broadcast audio signals

Nerve APs have a particular shape which can be modelled by sinewaves over a narrrow range of frequencies

current spread from the recording electrodes to your stimulating electrodes

the compound muscle action potential

the summed activity of all slow-conductin nerves in the Ulnar N

the compound nerve APs

the summed activity of all sensory nerves in the Ulnar N

Control the internal organs of the cockroach

Control the leg muscles of the cockroach

Receive motor input from the air as your breath near them

Receive sensory input from spines on the cockroach leg

Receive sensory input from the air acting directly on them

causing a flow of current that makes the inside of the axon ahead more negative.

means of current flow across the myelin sheath between the nodes of Ranvier.

releasing acetylcholine to stimulate the membrane ahead.

means of a flow of current that depolarises the membrane ahead of the action potential to threshold.

the activity of the Na-K pump.

Cause deflection of the spines on the leg

Electrically stimulate the neurons

Move the leg

Electrically stimulate the spines

Electrically stimulate the leg

Recording the difference in electrical activity between the two pins, as APs travel along neurons and arrive first at a point below one pin and then a little later at the point below the other pin 

Recording the APs at the first pin

Recording the APs between the two pins

Recording the APs at the first pin and then, a little later, the APs at the other pin

Recording the difference in size of APs between the two pins, as APs travel along neurons and arrive first at a point below one pin and then, a little later, at the point below the other pin 

Na+/K+ pump

voltage gated Cl- channels

voltage gated Na+ channels

voltage gated K+ channels

mechanically gated Na+ channels