Notes in 2- SNS

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Published	02/10/2024	{{c1::Neurons}} are the functional units of the nervous system.Made up of:- Cell body- Dendrites- AxonsTypes:- {{c1::Bipolar}} → two extensions- {{c1:…
Published	02/10/2024	{{c1::Myelin sheaths}} are made up of lipid and protein substances, they increase the conduction velocity of action potentials.They are secreted by {{…
Published	02/10/2024	Peripheral nerves are protected by 3 layers of connective tissue:- {{c1::Epineurium}} → dense layer of connective tissue covering multiple nerve fasci…
Published	02/10/2024	{{c1::Myotomes}} are parts of muscle supplied by a single spinal nerve• One may involve multiple spinal segments{{c1::Dermatomes}} are …
Published	02/10/2024	How can we benefit from myotomes?
Published	02/10/2024	Landmarks of dermatomes:T4 → level of {{c1::nipples}}T10 → level of {{c1::umbilicus}}
Published	02/10/2024	A {{c1::motor end plate}} is the area where the neuromuscular junction is (end of axon associated with muscle)a {{c1::Motor unit}} is a single mo…
Published	02/10/2024	Spinal cord histologyNB → {{c1::nissl bodies}} are large granular body found in neurons. These granules are of rough endoplasmic reticulum (…
Published	02/10/2024	Peripheral nerve histology (transverse section)P → {{c1::perineurium}}S → {{c1::septum}} (divides the fascicle into two compartments)MS → {{c1::myelin…
Published	02/10/2024	Nervous systemCNS → {{c1::Brain & Spinal cord}}PNS → {{c1::Cranial nerves (12 pairs) , Spinal nerves (31 pairs), peripheral ganglia}}Further subdi…
Published	02/10/2024	The Somatic nervous system:Somatic {{c1::Motor}} fibres → regulate voluntary control of body movement via skeletal musclesSomatic {{c1::Sensory}} fibr…
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Published	02/10/2024	Roots → either afferent/sensory or efferent/motor nervesSpinal nerves → both sensory and motor nervesRami → both sensory and motor nerves
Published	02/10/2024	Spinal nerve exits through {{c1::intervertebral foramen}}
Published	02/10/2024	Somatic Reflex ActionStimulus carried via sensory neurons to spinal ganglia where cell bodies are.Then it goes through spinal cord via dorsal rootConn…
Published	02/10/2024	{{c1::Somatic Reflex Arc}} describes the pathway through which a reflex is done.Sensory detection → afferent/dorsal/posterior neuronsInterpretation of…
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