HTHSCI 1H06 Lecture Notes - Vagus Nerve, Loose Connective Tissue, Facial Nerve
24 Sep 2013
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There is the medial rectus and lateral rectus that are to adduct and abduct the eye respectively. The medial rectus pulls the eye nasally or abduct the eye. When looking upward, need two muscles, the third cranial nerve innervate the superior rectus muscle. The inferior oblique helps to correct the pulling of eyeball. When the two muscles work together, it gives a straight upward view of world. Focusing eye convergent on the object, the contraction of cilary muscle allows the lens to round up increasing its magnifying power. So u are able to see that object. The lens cells that make up the lens, no nuclei, no mitochondria. That makes it crystal clear, so u can see through it. Then lens doesn"t last u for 40 years. It became stiff, it also vulnerable to uv light. Pupil is to adjust the size of iris. Iris is a piece of tissue with two muscles in it.
