Organising the nervous system
- Created by: une-meduse
- Created on: 01-06-13 14:18
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- ORGANISATION OF THE NERVOUS SYSTEM
- CENTRAL NERVOUS SYSTEM
- BRAIN AND SPINAL CORD
- PERIPHERAL NERVOUS SYSTEM
- SOMATIC NERVOUS SYSTEM
- MOTOR NEURONES CARRY IMPULSES FROM CNS TO SKELETAL MUSCLES - UNDER CONSCIOUS CONTROL
- MOST NEURONES ARE MYELINATED
- SOMATIC CONNECTIONS TO EFFECTORS CONSIST OF ONLY ONE NEURONE
- AUTONOMIC NERVOUS SYSTEM
- SYMPATHETIC NERVOUS SYSTEM
- MOST ACTIVE IN TIMES OF STRESS
- LINKED AT A GANGLION JUST OUTSIDE SPINAL CORD, VERY SHORT
- POST GANGLIONIC NEURONES SECRETE NORADRENALINE
- EFFECTS OF THIS ACTION INCLUDE
- INCREASED HEART RATE
- PUPIL DILATION
- INCREASED VENTILATION RATE
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- PARA - SYMPATHETIC NERVOUS SYSTEM
- MOST ACTIVE IN SLEEP AND RELAXTION
- LINKED AT A GANGLION WITHIN TARGET TISSUE, PRE GANGLIONIC NEURONES VARY IN LENGTH
- POST GANGLIONIC NEURONES SECRETE ACETYLCHOLINE
- EFFECTS OF THIS ACTION INCLUDE
- DECREASED HEART RATE
- PUPIL CONSTRICTION
- DECREASED VENTILATION RATE
- SEXUAL AROUSAL
- MOTOR NEURONES CARRY IMPULSES FROM CNS TO CARDIAC MUSCLE, TO SMOOTH MUSCLE IN THE GUT - INDEPENDENT OF CONSCIOUS CONTROL
- HOMEOSTATIC MECHANISMS
- STRESS RESPONSE
- MOST NEURONES NON MYELINATED
- AUTONOMIC CONNECTIONS TO EFFECTORS ALWAYS CONSIST OF AT LEAST TWO NEURONES
- SYMPATHETIC NERVOUS SYSTEM
- MADE UP OF NEURONES THAT CARRY IMPULSES INTO AND OUT OF CNS
- SOMATIC NERVOUS SYSTEM
- CENTRAL NERVOUS SYSTEM
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