Feb 27, 2023
Basal Nucleus of Meynert
Water soluble drugs
AchE Reactivators (Oximes)
AchE has 2 sites
Sympathetic system | Parasympathetic system |
Nerve fibres which originate from the thoraco-lumbar portion of spinal cord are called sympathetic nerve fibres. | Nerve fibres which originate from the Cervical or sacral portion of spinal cord are called parasympathetic nerve fibres. |
Consists of Thoraco- lumbar outflow | Cranio – sacral outflow |
Pre-ganglionic fibres are small and post-ganglionic fibres are long | Pre-ganglionic fibres are long and Post-ganglionic fibres are small |
Ganglion is near the spinal cord | Ganglion is away from the spinal cord |
Organ / Sympathetic system |
Parasympathetic system |
i. Heart : +++ (+ve chronotropic +ve dromotropic +ve ionotropic) |
-- (-ve chronotropic-ve dromotropic) |
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ii. Bronchus: Broncho-dilation |
Broncho-constriction |
iii. GIT: Constipation |
Diarrhea |
iv. Bladder: ↓ Urine outflow |
↑ Urine outflow |
v. Glands: ↓ Secretions (but sweat ↑) |
↑ Secretions |
vi. Eye: Mydriasis (Dilation of pupil) |
Miosis (Contraction of pupil) |
vii. Sex: Ejaculation |
Erection |
Previous Year Question
Question: Which of the the following action is expected on stimulation of muscarinic receptors? (AIIMS Jun 2020)
UNDERSTAND WITH EXAMPLE
Cholinergic Receptors
Muscarinic (M) |
Nicotinic (N) |
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Reversible AchE # |
Irreversible AchE # |
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1. Lipid soluble drugs
Organophosphates |
Carbonates |
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