19.1 Flashcards
The central nervous system includes the ___ and ___ ___.
Brain and spinal cord.
The two cerebral hemispheres are divided by the ___ ___.
Longitudinal fissure.
The frontal and parietal lobes are divided by the ___ ___.
Central sulcus.
There are ___ layers of neurons in the ___.
6 layers of neurons in the cortex.
The cerebellum and basal ganglia are important in ___ control.
Motor
The ___ ___ selects and initiates voluntary movements.
Basal ganglia.
The ___ is the major sensory relay to the cortex.
Thalamus (part of diencephalon).
There are ___ thalami.
2!
Left and right.
Thalamic nuclei project in 3 ways:
It relays ___ ___ to specific areas of cortex.
It relays ___-___ ___ from cortex and basal ganglia to specific areas of cortex.
It projects globally to ___.
Relays sensory information to specific areas of cortex.
Relays non-sensory information from cortex and basal ganglia to specific areas of cortex.
Project globally to cortex e.g. for arousal and sleep.
Cranial nerves may be pure ___ or pure ___, or ___.
Pure motor or pure sensory or mixed.
The spinal cord has an ___ layer of white matter and a ___ of grey matter.
Outer layer of white matter (axons up and down spinal cord, or local circuits in spinal cord only).
Core of grey matter.
The spinal cord is larger at the ___ and ___ levels to supply the ___.
Cervical and lumbar!
More grey matter to supply limbs.
The spinal cord stops at the level of approx L_/L_.
L1/L2!
Therefore, only roots in most of lumbar and all of sacral region.
Dorsal roots of the spinal cord are only ___ axons, from the periphery via ___.
Sensory axons only.
Via the dorsal root ganglia.
Ventral roots of the spinal cord are only ___ axons, to control ___ ___.
Motor axons only.
Ventral root neurons in ventral horn to control skeletal muscle.
