Lecture 8 Flashcards
(47 cards)
Ganglion
Collection of cell bodies located in the PNS that have similar function
Nucleus
collection of cell bodies located in the CNS that have similar function
CNS
brain, spinal cord , cranium nerves
PNS
Motor ( efferent ) Sensory ( afferent )
Afferent
Approach the CNS
Efferent
Evades the CNS
Tract
bundle of CNS axons
Nerve
bundle of axons only in the PNS
Motor unit
lower motoneuron and its associated set of muscle fibres
Lower motoneuron
Cell body in the ventral horm of the spinal cord and axon that innervates skeletal muscle
Upper motoneuron
have their cell bodies in the
forebrain/brainstem and
send their axons to activate lower motoneurons
Somatic
of the body / part of the body / things you control
Visceral
deep organs, guts inner organs
Grey matter
Neuronal cell bodies
White matter
neuronal cell axons
Sensory function
Sensory function: receptors detect internal and external
stimuli, carrying this info to your brain.
Integrative function
NS processes sensory info by
analysing, storing and making decisions.
Motor function
Upon integration, the NS elicits an
appropriate motor response, activating effectors
(muscles/glands)
Neurons are the parenchymal cell
- Electrically excitable.
- Use action potentials (impulse).
- Stimulate/activate other neurons or target cells (muscle/gland).
Action potential
Resting membrane potential -70 mV
the synapse
Electrical vs Chemical Synapse
Neuroglia CNS - Astrocyte
Astrocyte :
anchor neurons and blood vessels
regulate the Extracellular environment
Repair damaged tissue
facilitate the formation of the blood-brain barrier
feed neurons
Blood-brain barrier
The wall between the brain and the blood cells ( facilitated by astrocytes )
Neurogilia CNS - Oligodendrocyte
Myelianate ( myelin sheath insulating ) specific axons in the CNS
makes signals faster
ie stubbing toe at night takes a while to feel pain