T2: Nervous System Definitions Flashcards
1
Q
ganglion
A
knot-like swelling where huron cell bodies are concentrated
2
Q
grey matter
A
neuron cell bodies + glia
3
Q
white matter
A
myelinated axons + glia
4
Q
somatic
A
voluntary
5
Q
visceral
A
involuntary
6
Q
Action potential
A
momentary reversal of membrane potential
7
Q
Hyperpolarisation
A
membrane more negative on inside than RMP = refractory period
8
Q
Define myelin sheath
A
insulation around nerve fibre (ologeodendrocytes in CNS and schwann cells in PNS
9
Q
Neural crest
A
column on each side of neural tube formed by ectoderm
