Anatomy Test 4 - Nervous system

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start in front and move backnose, lots around eyes and then back#10-vagus- drops down to heart, lungs it’s the wandererold owls on tree tops are forever viewing green valleys and hillssome say money matters but my brother says big brains matter mosts= sensesm=motorb=both4 cranial nerves- parasympatheticknow chart - what is the sensory / motor functionknow brain chart or picture from lab bookcranial nerves can carry motor neurons only, sensory neurons only or bothdifferent than spinal nervesSPINAL CORDposition in body1. Foramen magnum L1/L2 (conus medullaris)a) spinal cord growth stops at about 4 years of ageb) vertebral column continues to grow until full height (~18 inches)cauda equina - horse tail off conus medullarisFunctions of vertebral column1. sensory/motor innervation below the neck (via spinal nerves)2. Two-way conduction between body & brain (tracts)3. Reflex center! - acts on own - some info in and respond to itProtection1. no attachment of dura mater to bone w/in spinal cavity2. epidural space filled w/ connect, tissue, fat & vessels3. cerebral spinal fluid - cushions cord4. meninges (ends at S2) dura mater, arachnoid, pia matera) dentriculate ligament- anchors cord laterallyb) filum terminale (coccygeal lig) anchors cord caudallyc) dura mater in cranial cavity- anchors cord craniallygray matter insidewhite matter outsidegray matter of spinal cord1. mostly cells bodies + interneurons unmyelinated2. "H" shape surrounding the central canal3. the "wings" of the gray matter represent the-dorsal (posterior) horn (sensory axons & interneurons)-ventral (anterior) horn (somatic- voluntary- motor cell bodies) to skeletal muscle-lateral horn- visceral motor/visceral sensoryDAVEdorsal afferent ventral efferentWhite matter of spinal cord - travel up and down1) white matter on outside of cord2. myelinated/unmyelinated axons
3. axons arrange in common "tracts" or "funiculi" / columna) funiculi (lateral/anterior/posterior)travel up, down or across one side to another2 tracings need to knowmotor tracing and sensory tractb) axons that share structural or functional similarities (ascending/descending)Dermatonesif on al 4's4 plexuses - neurons brake off nerve wrap around other nervescervicalbrachiallumbar plexus- front of legssacral- back of legs, bottom of foot, 1 feeds to top of foot****all spinal nerves carry both sensory and motorPNSmotor divisionsomatic + visceral (autonomic)autonomicsacraland cranial - parasympatheticcentral area- sympathetic4/14/03peripheral neuronneurons found traveling in a nervesomatic - 1autonomic-2 synapse in a ganglion -protect a cell bodyfind somatic neurons in every segmentautonomic found in regional sectionssympatheticblood flow to stomach stopnot salivateHR incsweatThorocolumbar T1-L2preganglionic neuron + postganglionic neuronadrenal medulla only one w/single neuron(norepenephrine, epinephrine)parasympathetic-craniosacral CN3,7,9,10 S2-S4pain helps prevent death warningpicture-most sensory info makes it to thalamusthalamus holds things in checkdoesn't bring everything to conscious leveloccipital love- flashes of light--sight
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Anatomy Test 4 - Nervous system

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