Nervous System II Flashcards
(85 cards)
Meninges
Membranes that surround the CNS
Dura mater
The outermost layer of the meninges
Means tough mother
Arachnoid Mater
Spider web layer of the meninges
Subarachnoid contains CSF
Pia Mater
Innermost layer of the meninges
Encapsulates the blood vessels
Means faithful mother
Ventricles
Interconnected cavities within the cerebral hemispheres and brain stem
4 of them (2 lateral)
CFS filled
Cerebro Spinal Fluid
Composed of sodium ions
Produce 500ml daily. Keep 120ml
Clear fluid
Maintain stable ion concentration
Spinal Cord Overview
A column of nervous tissue that begins at the magnum foremen and extends down the vertebrae.
Center of spinal reflexes
It is a pathway for nerves impulses to and from the brain.
Reflex Arcs
Automatic subconscious response to stimuli that occurs inside and outside the body
Knee-Jerk reflex
Simple monosynaptic reflex (sensory to motor neuron)
Maintains upright posture
Withdrawal reflex
When the body pulls back from pain
Prevents tissue damage
The order of the reflex arc pathway
- receptor
- Sensory neuron
- Interneuron
- Motor neuron
- Effector
Ascending tracts
Conduct sensory impulses to the brain
Descending tracts
Conduct motor impulses from the brain to the motor nerves in the muscles and glands
Three functions of the brain
Interprets sensations
Visceral activity
Personality
Four parts of the brain
Cerebrum
Diencephalon
Cerebellum
Brain stem
Three parts of the brainstem
Midbrain
Pons
Medula oblongata
Corpus callosum
A bridge of nerve fibers that connect cerebral hemispheres
Lobes of the Cerebrum
Frontal Parietal Occipital Temporal Insula (inside)
Convolution or gyri
Shallow ridges in the cerebrum
Sulci
Somewhat deep groovesin the cerebrum
Central sulcus
Separates the frontal and parietal lobes
Fissures
Very deep grooves
Longitudinal fissure
Separates the right and left cerebral hemispheres
Transverse fissure
Separates the cerebrum for the cerebellum