The Nervous System: An Overview

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Western physiology 1021
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CNS central nervous system (encased by bone) - brain, spinal cord
PNS peripheral nervous system (everything else) - Somatic system - Visceral system (autonomic nervous system) -> (parasympathetic, sympathetic)
What is the somatic nervous system? Spinal nerves Voluntary action
What is the visceral system? What are the tw categories? Autonomic nervous system (involuntary action) - Internal organ function Two categories: 1. Parasympathetic: post-stress recovery 2. Sympathetic: getting ready for stress
Views of the brain: DORSAL bird's eye view
Views of the brain: VENTRAL from below
Views of the brain: LATERAL side view
Views of the brain: MEDIAL (midline) cut in half
1. dorsal 2. ventral 3. lateral 4. medial
Anterior Rostral ahead/front
Posterior Caudal Behind/towards the back
Dorsal Back
Ventral front or belly
Midline the central axis
Medial towards the middle or midline
Lateral towards the side
Ipsilateral same side
Contralateral opposite side
Planes through the Brain: 1. Midsagittal section cut vertically through the brain
Planes through the Brain: 2. Horizontal: section cut through horizontally
Planes through the Brain: 3. Coronal horizontal from the top
Midsagittal Horizontal Coronal
List the major parts of the CNS (4) Cerebrum Cerebellum Brain Stem Spinal Cord
Cerebrum –______________ cortex - two ________________ _______________divided by the ________ _____________ (midline) - concerned with ________________ sensation and movement cerebral cerebral hemispheres sagittal fissure contralateral
Cerebellum - ______ hemispheres - concerned with ___________________ motor control two ipsilateral
Brain stem - most ______________ part of the brain - concerned with ____ _____________ (respiration, body temp) primitive life functions
Spinal cord - responsible for ___ conduit for info to and from the brain
(left to right) Cerebrum Cerebellum Brain stem Spinal Cord Sagittal fissure Brain stem
Major brain divisions: 1. Forebrain - - 2. Midbrain: - - 3. Hindbrain - - 1. cerebral cortex thalamus (retina) 2. midbrain - tectum (sup. & inf. colliculus) - tegmentum 3. Hindbrain - cerebellum and pons - medulla
The spinal cord has __ segments Each segment has a pair of _____ ______ Each spinal nerve consists of a: 1. ___________ root (sensory) 2. _________ root (motor) 31 spinal nerves dorsal root ventral root
The spinal cord has five regions, with different numbers of spinal segments: 1. 2. 3. 4. 5. 1. Cervical – 8 2. Thoracic – 12 3. Lumbar – 5 4. Sacral – 5 5. Coccygeal - 1
What is a dermatome? Skin surface sensory region
How many pairs of cranial nerves are there? What is their responsibility? 12 pairs they take care of function in the head
Meninges - "covering" (greek) What are the 3 meninges that cover the brain? 1. Dura mater "hard mother" (thick like leather) 2.Arachnoid "spider" (greek) 3. Pia Mater "gentle mother"
The ventricular system is a set of ____interconnected cavities (ventricles) in the brain, where the __________________ is produced. 4 cerebrospinal fluid (CSF)
Most _____________ is found within the ventricular system, in the brain. Spaces within the brain that contain CSF are called _________. The ventricular system is a series of ventricles and canals that move CSF within the brain and transport in out to the _____________space. choroid plexus ventricles subarachnoid
Your ventricular system contains about ____ml of CSF. You produce about _____ml/day 150 500
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