BIO202H5 Lecture 43: bio202 lecture part --43
Document Summary
Organization of invertebrates eye structures is different than vertebrate eyes in that they can be compound (they can have multiple views at once) Rhabdomeric receptors are seen in both vertebrates and invertebrates, but are more commonly seen in i(cid:374)verte(cid:271)rates (there"s less foldi(cid:374)g i(cid:374) the photore(cid:272)eptor cells less cells receiving information) I(cid:374) (cid:272)iliary (cid:272)ells, there is (cid:373)ore foldi(cid:374)g a(cid:374)d they"re (cid:373)ore complex and have disks in them. Rods are sensitive to very dim light. Humans have three types of cones (red, green, blue), each with a unique absorbance maximum. Signals from each type of cone are integrated and compared in the brain so that over 1000 different wavelengths of light can be interpreted. Signal pathways of rods converge into one ganglion cell of the optic nerve. Signal pathways of cones do not converge and thus include input from only a single photoreceptor cell. Both bipolar and horizontal cells communicate with photore(cid:272)eptors.
