NUR 305 test 4 A

NUR 305 test 4 A - 1 N UR 305 Test 4 Notes A CH 16 Spina...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 N UR 305 Test 4 Notes A CH 16 Spina Bifida (one question on this test) Defect of neural tube closure, often caused by a folate deficiency Vertebral defect allows protrusion of the neural tube and its contents Causes gait abnormalities, incontinence (involuntary discharge of urine), and deformities of the feet Affects 10-25% of newborns Tests for alpha-fetoprotein helps determine if a baby will have spina bifida CH 13 Sensory Functions Vision The most important structure from anatomy that you need for patho from the eye is Canal of Schlemm. o The Canal of Schlemm is a circular channel in the eye that collects aqueous humor from the anterior chamber and delivers it into the bloodstream o The eye receives oxygen and nutrients from the aqueous and vitreous humor. Aqueous humor fills the aqueous chamber and helps maintain pressure inside the eye, as well as provide nutrients to the lens and cornea. Vitreous humor (gel-like substance) that is contained in the vitreous chamber and helps to prevent the eyeball from collapsing inward. The eye is attached to the brain at the optic nerve and is the visible part of the brain. o Gateway to processing 2 The arteries and veins of the eyes are located on the exterior walls. Can see diabetes through the eyes o Able to see the micro aneurisms. Cornea- portion of the sclera that allows light to enter the eye Retina- contains photoreceptors (cones and rods) that change light energy into nerve impulses Lens- focuses light onto the retina Aqueous humor- helps maintain pressure inside the eye and nourishes the lens and cornea o CSF in the eye (but special just for eyeball). Vitreous humor- helps to prevent the eye from collapsing inward Canal of schlemm- reabsorbs aqueous humor, if its blocked intraocular pressure increases Visual Dysfunction Alteration in Visual Acuity (page 319) o Age related macular degeneration is thought to be linked back to when your mother ate and you were a fetus. Children born to malnourished mothers have macular degeneration at an earlier age. Severe and irreversible loss of vision (major cause of blindness in older people) Risk factors: hypertension, cigarette smoking, and diabetes mellitus. It is the intake of vitamin A during prenatal life that seems to predict whether or not you are going to have macular degeneration. No cure, the only thing we can do is catch it early and give large amounts of vitamin A and lutein which is a vitamin you can take. 3 o Strabismus- one eye deviates from the other when the person is looking at an object Caused by weak or hypertonic muscles in one eye. Primary symptom is diplopia (double vision) o Glaucoma (too much pressure) - intraocular pressure greater than or equal to 20 mmHg. Loss of acuity results from pressure on the optic nerve which blocks the flow of nutrients to optic nerve fibers, leading to their death. 6 th leading cause of blindness....
View Full Document

Page1 / 33

NUR 305 test 4 A - 1 N UR 305 Test 4 Notes A CH 16 Spina...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online