Anatomy Flashcards
Nuclei
Bundles of cell bodies in the CNS
Ganglia
Bundles of cell bodies in the PNS
Schwann Cells
Myelinate axons in the PNS
Oligodendrocytes
Myelinate cells in the CNS
White matter
Myelin covered axons
Grey matter
Unmyelinated neuron structures
Nerve
Bundle of axons in the PNS
Tract
Bundle of axons in the CNS
Sensory Neurons
Send info to the CNS
Motor neurons
Carry info from the CNS to glands, organs, and muscles
Somatic nervous system
Part of the PNS that controls the voluntary systems (afferents from skin, muscles, joints)
Autonomic Nervous System
Part of the PNS that controls involuntary muscles such as cardiac and smooth muscle
CNS
Brain and Spinal cord
Brainstem is composed of…
Mesencephalon (midbrain), pons, medulla oblingata
Inside of the cell charge
-70mV
What maintains the resting state in a cell
Sodium/Potassium pump
Activation Threshold
When an action potential is fired -55mV
Axon Hillock
Where the soma and axon meet and summation of of IPSP and EPSPs occur
Efferent signals go towards…
The effector cell
Afferent signals go towards…
The brain
Motor Cortex
Pre central gyrus
Somatosensory cortex
Post central gyrus
Conus Medullaris
Bottom of the spinal cord, typically around T12-L2
Cauda Equina
(Horses Tail) bundle of nerve roots past the conus medullaris that exit out the lumbar vertebrae
Myotomal level
All the muscles innervated by a nerve root
How many arteries provide blood supply to the dorsal column?
2 posterior spinal arteries
How many arteries perfuse the anterior 2/3 of the spinal cord?
1 anterior spinal artery
ACA perfuses what part of the brain?
Medial part of the brain
MCA perfuses what part of the brain?
Lateral parts
3 types of sensory information transmitted by the Dorsal column
Vibration, fine touch, proprioception
