BIOL 129 Lecture 21: Special Senses Part 2
Document Summary
Taste buds: sensory organs for taste; most are located on papillae: projections of tongue mucosa. Gustatory cells: sensory cells that form taste buds. Cranial nerves vii and ix carry taste information back to the brain. In the embryo, the tongue develops from two structures that later fuse together. Because of this, the anterior and posterior parts of the tongue are innervated by different nerves. Has all four types of neurons (only need to know two) Has all four types of neurons (only need to know three) Extremely loud sounds can cause the membrane to rupture: can result in hearing loss. Auricle: cup-like projection, funnels sound waves into auditory canal. Auditory canal: short tube, external part is cartilage and the internal part is within the temporal bone. Middle ear: hollow, air-filled chamber within the temporal bone. Ossicles: three small bones of the middle ear (malleus, incus and stapes) There are two muscles in the middle ear.
