SL 8 Flashcards
A bundle of axons in the peripheral nervous system is referred to as a
Nerve
A bundle of axons in the CNS is known as a
Tract or commisure
Cerebral cortex
Perception, skilled movement, reasoning
Example of interconnecting axonal pathways
Corpus callosum
Corpus callosum
Massive bundle of axons that connects left and right hemispheres of cerebrum
White matter is found deep to the
Cortex, and consists of myelinated axons
Cerebral cortex consists of what type of matter
Grey
Sulci
Grooves/ invaginations of the lobe
Gyri
Defined as ridges of the lobe
Subcortical nuclei
Grey matter found deep within the cerebral hemispheres
Thalamus
Integration center
Limbic system contains
Parts of the frontal lobe cortex, temporal lobe, thalamus, and hypothalamus
Main functioning of limbic system
Visceral and endocrine
Hypothalamus
Master command center for neural endocrine coordination, and homeostatic regulation
Epithalmus
Contains the pineal gland that functions to control circadian rhythm through release of melatonin
Cerebellum regulates ____ control
Motor
Reticular formation
Lossley arranged nuclei that’s are intermingled with axons to receive and integrate input form all regions of CNS
Brainstem is composed of
The midbrain, pons, medulla oblongata, reticular formation
Meninges
Protects the CNS and absorbs cerebral spinal fluid
Meninges are comprised of three layers
Dura (outermost), arachnoid, and pia (inner most)
Dura matter
Thick superficial layer of meninges
Subarachnoid space
Found between arachnoid and pia matter
What is the function of choroid plexus
Producing csf and circulating it through ventricles and subarachnoid space
Blood brain barrier is formed by
Astrocytes
In the Spinal cord unlike the brain grey matter is found
Deep to the white matter
Afferent neurons enter the spinal cord
on dorsal side
Efferent neurons leave the spinal cord through
Ventral side
Somatic nervous system axon characteristics
- large diameter myelinated axons
- axons travel from CNS to skeletal muscle without additional synapse
- excitatory only
Axons in the autonomic nervous system characteristics
- can be excitatory or inhibitory
- synapse/ ganglion exists
Divisions of the autonomic nervous system
Sympathetic, parasympathetic, enteric
Sympathetic nervous system
Fight or flight response
Major neurotransmitter released between pre and post ganglionic neurons in sympathetic nervous system
Acetylcholine
Major neurotransmitter released between post ganglionic and effector cells in sympathetic nervous system
Norepinephrine
Epinephrine and norepinephrine are released from
Adrenal medulla
Parasympathetic nervous system is known as
Rest and digest
In the parasympathetic nervous system the major nt is
Always acetylcholine
Parasympathetic nervous systems body effects
Construct pupil, decrease heart rate, anabolism
