Pre lab for 17-19 - pre lab assignment PDF

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Kristen Trunkey Pre Lab Ex 17-19 5/12/2019

1. List the structures in the eye that light passes through on its way to the retina. Cornea, anterior segment, pupil, iris, and lens 2. What is the iris and what is it made out of? The iris a flat, colored, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the center and is made of connective tissue, smooth muscle fibers, and pigments that give the iris its color. 3. List the six muscles that position our eyeballs. Which cranial nerves control these muscles? Lateral rectus, medial rectus, superior rectus, inferior rectus, inferior oblique, superior oblique oculomotor nerve (III), trochlear nerve (IV), and the abducens nerve (VI) innervate the extrinsic muscles of the eye 4. Speaking of cranial nerves, which cranial nerve carries information about balance and hearing? The Vestibulocochlear nerve carries information about balance and hearing. 5. Complete question #4 from the Exercise 19 Review Sheet. The figure is below. Your options include:  Print out this page, fill in the labels by hand, take a picture of the filled-out page, and upload the picture to Canvas.  Copy the digital image into a program like PowerPoint where you can add your own labels, and upload the final file to Canvas.  Just submit a text description of the labels (e.g., “Labels in clockwise order starting from the top left: auricle, tympanic membrane…”).

Auricle Interal ear (labyrinth) Middle ear Tympanic membrane

Semicircular ducts in semicircular canals Vestibular and cochlear nerve Oval window Spiral organ Round window Pharyngotympanic membrane

External acoustic meatus Lobule

Stapes (stirrup) Incus (anvil)

External ear

Malleus (hammer)

Auditory ossicles...