Post on 15-Jan-2016
transcript
Chapter 9.3: The Senses
Chapter 9.3: The SensesTaste PathwaysFacial, Glossopharyngeal and VagusTrigeminalgives us peppery and spicy hotSeveral thousand times more sensitive to taste when smell is involvedVisionAccessory StructuresPalpebraeEye lidsLubricateFree from dustProtectFigure 9.8a
Accessory contEyelashesProtectionsFigure 9.8a
Accessory contSebaceous GlandsIn eyelashesKeeps eyelids from stickingStyPainful swellingDue to bacterial infection
Accessory contConjunctivaMembrane over eyeVery sensitiveConjunctivitisAKA: PinkeyeDamage/irritation to conjunctiva
Accessory contLacrimal ApparatusProduces, distributes and removes tearsConstantly cryingMoistens and cleansReduce frictionRemove debrisPrevent bacterial infectionProvide nutrients and oxygen to conjunctivaFigure 9.8b
Accessory contNasolacrimal ductConnects eye to noseFigure 9.8b
Accessory contExtrinsic eye musclesControl eye positionFigure 9.9a
The EyeFibrous TunicsOutermost layer of the eyeSupport and protectionAttachment site for musclesAssists in focusingFigure 9.10b
Fibrous tunics contScleraWhite of the eyeMuscles insert hereFigure 9.10b
Fibrous contCorneaNo blood vesselsLimited repairFigure 9.10b
Figure 9.10a
Vascular tunicsBlood vessels for the eyeRegulates light into eyeControls shape of lensFigure 9.10b