Exam 3 Nervous System 2 Flashcards
1
Q
what is a mixed nerve/compound nerve?
A
multiple axons of varying diameter
2
Q
what is an example of a mixed nerve/compound nerve?
A
sciatic nerve
3
Q
endoneurium
A
internal connective tissue that wraps around each individual axon
4
Q
perineurium
A
internal connective tissue that bundles groups of axons together
5
Q
epineurium
A
outer connective tissue that holds all the nerves and bundles together
6
Q
what is threshold voltage directly proportional to?
A
axon diameter
7
Q
what is AP velocity (the speed of AP conduction along the axon) directly proportional to?
A
axon diameter
8
Q
what is the diameter and speed of the largest unmyelinated axon in invertebrates?
A
1000 micrometers; 25m/s
9
Q
what is the diameter and speed of the largest myelinated axon in vertebrates?
A
20 micrometers; 125 m/s
