Variables describing the soma | |
Somatic perimeter (μm) | Perimeter of the soma |
Somatic area (μm2) | Area of the soma |
Somatic aspect ratio | Max. diameter of soma/min. diameter of soma |
Somatic compactness | [([4/π] * area)1/2]/max. diameter |
Somatic form factor | (4π * area)/(perimeter 2) |
Somatic roundness | (4 * area)/(π * max. diameter 2) |
Variables describing the axon | |
Axonal node total | Total number of axonal nodes (branching points) |
Total axonal length (μm) | Sum of lengths of all axon segments, measured along tracing (not straight line distance) |
Total surface area of axon (μm2) | 2πr2 + 2πrh, surface area calculated by modeling axon as a cylinder with diameter defined by thickness of segment in reconstruction |
Ratio of axonal length to surface area (1/μm) | Total axonal length/total surface area of axon |
Highest-order axon segment | Maximum number obtained after each segment is numbered by how many nodes it is removed from the initial segment |
Axonal torsion ratio | Total axonal length/total axonal length of fan in diagram where the fan in diagram is 2D projection of the neuron constructed by compiling traces swept around a vertical axis; torsion ratio = 1 corresponds to no loss of length; values larger than 1 correspond to the factor by which the processes have decreased in the fan in diagram |
K-dim of axon | Fractal dimension of the axon calculated using linear regression and the nested cubes method |
Axonal polar angle average | Average of polar angles of all axonal nodes; the polar angle is the angle between the two lines passing through the node and the endpoints of the next segments |
Axonal polar angle SD | SD of axonal polar angles |
Axonal local angle average | Average of local angles of all axonal nodes; the local angle is the angle between the two lines passing through the node and points adjacent to the node on the two following segments |
Axonal local angle SD | SD of axonal local angles |
Axonal spline angle average | Average of spline angles of all axonal nodes; the spline angle is the angle between the two lines passing through the node and smoothed points adjacent to the node when the following two segments are approximated by a cubic spline |
Axonal spline angle standard | SD of axonal spline angles |