Autonomic Nervous System Flashcards
Adrenergic
1) Referring to neurons that secrete norepinephrine or epinephrine
2) referring to drugs that bind with/activate the same receptors as NE or E
3) referring to receptors that bind NE, E, or agonist drugs
Adrenergic Receptors
Receptors in the sympathetic NS that respond to NE or E or to adrenergic drugs
Subtypes = alpha, beta
Capacitance Vessels
vessel whose relaxed walls expand to contain more blood
- blood pools in these vessels
Cholinergic
1) a neuron that secrets ACh
2) drugs that bind with/activate the same receptors as ACh
3) receptors that bind ACh or agonist drugs
Cholinergic Receptors
receptors that respond to ACh
- found in CNS and ANS and on the motor end plate in skeletal muscle membranes
- subtypes include nicotinic and muscarinic
Craniosacral outflow
parasympathetic NS
Horner syndrome
drooping of upper eyelid, constriction of pupil, vasodilation with absence of sweating on the ipsilateral face and neck
- caused by lesions of the cervical sympathetic chain or its central pathways
Muscarinic receptor
receptor on an organ innervated by a postganglionic parasympathetic neuron
- ACh binding to muscarinic receptors initiates a G protein-mediated response
Nicotinic Receptor
receptors on postsynaptic neurons in autonomic ganglia and on the motor end plate of skeletal muscle
- ACh binding to nicotinic receptors causes a fast excitatory postsynaptic potential in the postsynaptic membrane
Solitary Nucleus
main visceral sensory nucleus
- receives info from oral cavity and thoracic/abdominal viscera via CN X, IX, VII
- involved in regulation of visceral function
- located in dorsal medulla
Syncope
Fainting
- loss of consciousness caused by an abrupt decrease in blood pressure that deprives the brain of adequate blood supply
Thoracolumbar outflow
the sympathetic nervous system
