PNS Autonomic nervous system Autonomic NS regulates smooth
- Slides: 18
PNS: Autonomic nervous system Autonomic NS regulates smooth muscle, cardiac muscle, gland tissue and adipocytes • Anatomy of efferent pathways – Sympathetic vs parasympathetic vs somatic motor – Location of neurons and synapses – Neurotransmitters • Specific autonomic neuron functions • Neurotransmitter receptor mechanisms
* Autonomic efferent neurons: preganglionic and postganglionic
Neural Systems
Parasympathetic Division • • “Rest and digest”, relaxed state Does not typically activate as a whole Decrease HR, increase digestive fxn Preganglionic neurons originate in midbrain, medulla, pons and 2 -4 sacral • Preganglionic fibers long, post short
Sympathetic Division • Fight or flight (prepares for intense activity) • Heart rate increases, bronchioles dilate, plasma [glucose] increases • Preganglionic neurons originate from spinal cord from T 1 to L 2 spinal nerves • Preganglionic short, post-long • Can have mass action: distributed to heart, blood vessels, skin, adrenal glands
http: //medlib. med. utah. edu/kw/hyperbrain/anim/reflex. html
Neurotransmitters and Receptors • ACh receptor = cholinergic receptors – nicotinic – muscarinic • NE and E receptor = adrenergic – 1 and 2 (alpha) – 1 and 2 (beta)
Human Physiology, 6 th ed. , Fox, SI; WC Brown, Fig. 9. 9
Parasympathetic • preganglionic ACh : nicotinic receptor … is a Na+ / K+channel • postganglionic ACh: muscarinic rec. G-protein coupled receptor links to 2 nd messenger; several different kinds
Sympathetic • preganglionic ACh : nicotinic receptor …is a Na+ / K+channel • postganglionic NE: adrenergic receptor, alpha or beta, G-protein coupled receptor links to 2 nd messenger (see Table 11. 1)
Adrenergic receptors Rec. Intrac. effect Functional roles, locations 1 IP 3, DAG contractile for smooth m. , blood vessels 2 c. AMP inhibitory, GI tract, pancreas 1 c. AMP cardiac muscle, kidney 2 c. AMP relaxes smooth m. , GI tract, blood vessels, bronchioles
Autonomic Motor NS • Central control by limbic system, hypothalamus, brainstem, spinal cord. • Adrenergic receptors. • Example pathways with autonomic motor efferents.
Influence of Brain on Autonomic Functions Thoughts & emotions influence ANS by hypothalamus. ANS integrating center that interacts with cerebrum, limbic system, brainstem, and spinal cord. ANS reflex centers for controlling pupil size, accomodation, tear production, salivation, coughing, digestive activities, heart, blood vessel diameter and respiration. ANS reflex control of defecation, urination, genital erection and ejaculation.
Spinal cord
- Ans
- Autonomic nervous system muscles
- Autonomic nervous system consists of
- Autonomic nervous system pathway
- Ganglion on spine
- Autonomic nervous system
- The autonomic nervous system controls
- Parasympathetic and sympathetic
- Autonomic dysreflexia
- Nervous system chart
- Nervous system
- Label the different types of neuronal pools in the figure.
- Fundamentals of the nervous system and nervous tissue
- Processes of nerve cell
- What does mla regulate
- Autonomic nerveous system
- Nervous system and digestive system
- Endocrine system vs nervous system
- Mechanism of hormone action