Intro Lec 1 Flashcards
Subventricular zone
Supports olfactory fxn in rodents supports striatal (basal ganglia) fxn in humans
Subgranular zone within the hippocampus
Supports memory fxn
Gray matter
increases with learning
Ex: london taxi driver
Who has profound influences on other scientists, artists, and philosophers
Galen
da Vinci
Vesalius
Three basic fans of NS
Senstation
Perception
Action
The gain in the brain…
came mainly from the stain
Large dendritic cells
Pyramidal cells in cerebral cortex/Purkinje cells
collect and/or integrate info, then send to target
Bipolar cells
Relay stations
Astrocytes
-Glial cell in CNS
-bridge neurons and capillary endothelial cells
-Mechanical and metabolic support to neurons
-contribute to BBB and control transport from blood to neural tissue
from ectoderm
Oligodendocyte
Glial cell in CNS
Forms part of myelin sheath
From ectoderm
Microglia
Glial cell in CNS
from hematopoetic sources
provide protection to nerve tissue
Free nerve endings
Little to no myelin
most sensitive to pain and temp
thicker myelinated axons Pacinian and meissner corpuscles
Light touch and vibration
thicker myelinated axons ruffini corpuscles and merkel disks
sustained pressure
Steps of knee jerk reflex- Hammer tap
1st step
Stretches tendon which stretches sensory receptors in leg extensor muscle
Steps of knee jerk reflex- 2nd steps
- Sensory neuron synapses and excites motor neuron in spinal cord
- Sensory neuron also excites interneuron
- interneuron synapse inhibits motor neuron to flexor muscles
Steps of knee jerk reflex- 3rd steps
- Motor neuron conducts AP to synapses on extensor muscle fibers, causing contraction
- flexer muscle relaxes b/c the activity of it motor neurons has been inhibited
Steps of knee jerk reflex- 4th step
leg extends
Sensory neurons
Afferent
long dendrite
short axons
carry info from sensory receptors to CNS
Motor Neurons
efferent
long axon
short dendrites
CNS to muscles or glands
Interneurons
found only in CNS
interconnect other neurons
Size in somatosensory cortex
directly proportional to the # and density of sensory fibers
-NOT surface area or size of the body part
