Brain and cranial nerves Flashcards
central nervous system
brain and spinal cord which interpret the incoming sensory information and issue instructions based on that information and past experiences.
peripheral nervous system
consists of the cranial and spinal nerves, ganglia and sensory receptors
sensory portion of PNS
consists of nerve fibers that conduct impulses away from the CNS
motor portion of the PNS
contains nerve fibers that conduct impulses away from the CNS.
somatic division of the motor portion of PNS
voluntary; controls the skeletal muscles
autonomic nervous system of PNS
unvoluntary; controls smooth and cardiac muscles and glands.
neural tube
simple tubelike structure formed during embryonic development, CNS, beginning of brain and cord
cephalization
elaboration of the rostral or anterior portion of the CNS, along with an increase in the number of neurons
Primary brains vesicles
as neural tub forms , its rostral end begins to expand and constrictions appear that mark off three areas:
prosencephalon
mesencephalon
rhombencephalon
Prosencephalon
forebrain, forms the secondary brain vesicles, the telencephalon and diencephalon
Mesencephalon
midbrain,primary brain vesicle; forms the secondary brain vesicles, mesencephalon
Rhombencephalon
hindbrain; primary brain vesicle, forms the secondary brain vesicles, the metencephalon, myelencephalon
telencephalon
forms the cerebrum: cerebral hemispheres (cortex, white matter, basal nuclei
diencephalon
forms the diencephalon (thalamus, hypothalamus, epithalamus), retina
mesencephalon
forms the brain stem: midbrain
