Nervous System Flashcards
Parts of a nerve cell
Cell body Dendrites Axon Myelin sheath Neurilemma Node of fancier Acon terminals Synapse
Nerve impulses jump via
Neurotransmitter chemicals released by nerve endings
What is a nerve impulse in terms of chemical
Sodium and potassium ions inside a cell
Positively charged
In resting state the concentration of sodium is lower inside than in the tissue outside and potassium is higher inside than outside
Sodium potassium pump
Restoring in inside of the cell having more negative charge than outside
When a sense is detected by a receptor the axon membrane becomes more open to receiving sodium ions which rush in and make the cell more positive
Nerve impulses only travel
1 direction
Cerebrum function
Control voluntary movement
Cerebellum small brain function
Muscle tone posture coordinate muscle activity
Hypothalamus within cerebrum function
Regulates body temperature water balance and metabolism And drives such as hunger sex pain thirst appetite
Regulates pituitary
Master gland
Links nervous and endocrine
Secretes oxytocin and ADH
Brain stem parts
Mid brain pons medulla
Function of midbrain
Relay station
Messages to and from spinal cord and cerebrum and cerebellum
Pons function
Messages to and from spinal cord and cerebrum
Medulla location
Above spinal cord below pons
Construction of medulla
White matter on surface grey matter in centre
Why is medulla vital centre
Vagus verve controls heart and lungs and breathing and swallowing
Cervical plexus
C1-4
Brachial plexus
C5-T1
