The Central Nervous System (CNS)
Includes the Brain and Spinal chord.
Together these organs unite and control the entire nervous system
A very complex organ.
Located within the cranial cavity of the skull.
The brain has several parts :
The outer covering of the brain, responcible for higher thought functions and awareness.
The outer covering of this is the Cerbral Cortex- the true thinking part of the brain.
Right and left sides control opposite sides of the body
The Corpus Collasum joins and integrates these hemispheres.
A lump below the cerebrum. helps co-ordinate control of skeletal muscles helps with detailed skills that are learned.
- guitar players can quickly change chords
helps muscles maintain equilibrium
helps maintain posture
deep in the center of the brain, it is composed of two smaller organs
-sends sensory impulses to the proper parts of the brain
-connects the limbic emotions with the conscious control of the cortex arousal/alerting complex reflexes
-connects conscious functions with autonomic
-ties nervous system and endocrine system together
-acts as an endocrine gland
The most basic part of the brain, involved in basic life functions
-an extention of the spinal cord that relays all brain activity to the spinal cord
-controls several vital reflexes
-relays info between cerebrum and cerebellum
-(hidden in this view)
-involved in visual and auditory pathway
A narrow chord of nerves that run towards and way from the brain.
The Peripheral Nervous System (PNS)
Includes the various nerves of the body and the sensory receptors.
Bundles of axons running towards or away from the brain.
May contain individual axons that can be over on meter in length.
Send messages away from the CNS towards the peripheral areas of the body.
-concious motor control
- skeletal muscles
-goes through sympathetic ganglia and innervates
-avoids sympathetic ganglia
Receive stimuli and relay it to the CNS for processing. Includes receptors for:
-The five senses:
-touch (and other skin senses)
-“Other” sensory input
-Stretch receptors (muscles)