I am building a 3 compartment model from a detailed morpholgical recontruction of a pyramidal cell.

The basic idea is to build compartments in typical length with a diam that keeps the membrane total area of the detailed model.

My question is how does the area() function calculate the area of a cylindrical segment?

If I build a single compartment with L=100 and a diam =10 area gives:

Code: Select all

```
area(.5)
3141.5927
```

The nrn help tells me the area fct uses numerical (trapezoidal rule) integration to integrate the

**effective**(?) area of a compartment/segment?

What means

**effective**then?

Either this integration seems to be pretty bad or I missed an essential point?!

Many thanks for a clarifying answer!

UB