Autonomic and Somatic Motor Control Flashcards
(23 cards)
Autonomic motor control
Autonomic reflexes, antagonistic control, control of cardiac and smooth muscle and glands in homeostasis
Somatic motor control
CNS control of skeletal muscles through neuromuscular junctions
Autonomic nervous system
Involuntary information to/from glands, regulation of homeostasis
Somatic nervous system
Voluntary information from CNS to skeletal muscles, required for movement
Antagonistic branches of ANS
Parasympathetic, sympathetic nervous system
Parasympathetic nervous system
Rest and digest, restores body functions
Sympathetic nervous system
Fight or flight, energetic action
Hypothalamus regulates
Water balance, temperature, hunger
Pons regulates
Respiration
Medulla regulates
Respiration, cardiac function, vomiting, swallowing
Autonomic pathways
Involve two neurons in a series (preganglionic, postganglionic)
Antagonistic control
Excitatory and inhibitory control system (parasympathetic and sympathetic control)
Sympathetic pathway neurotransmitters
Acetylcholine, norepinepherine
Parasympathetic pathway neurotransmitters
Acetylcholine
Target tissues for sympathetic and parasympathetic pathways
Symp: Adrenergic receptor
Parasymp: Muscarinic receptor
Autonomic targets
Smooth muscle, cardiac muscle, exocrine glands, endocrine glands, lymphoid tissue, adipose tissue
Neuroeffector junction
Synapse between postganglionic autonomic neuron and autonomic target cell
Varicosities
Vesicles of postganglionic neurons that contain neurotransmitters and mitochondrion
Sympathetic control
Pupil dilation, salivation, heart beat and volume, blood vessel and bronchodilation, fat breakdown, ejaculation; inhibition of digestion, pancreas secretions, urination
Parasympathetic control
Constricts pupils and bronchioles, slows heart, stimulations digestion, insulin release, urination, erections
Primary function of somatic nervous system
Posture, movement
Somatic motor division terminates in
Neuromuscular junction
Horner’s syndrome
Ipsilateral loss of sympathetic innervation, parasympathetic innervation dominates (pupil in relaxed state at all times, cannot dilate)
