Ampullae of Lorenzini
Definition
Ampullae of Lorenzini are specialized electroreceptor organs found in cartilaginous fishes like sharks and rays. They detect electric fields generated by other organisms, aiding in prey detection and navigation.
5 Must Know Facts For Your Next Test
- Ampullae of Lorenzini are located on the head, particularly around the snout of cartilaginous fishes.
- These organs can detect weak electric fields as low as a few nanovolts per centimeter.
- They play a crucial role in locating prey buried under sand or mud by sensing their bioelectric fields.
- The ampullae are filled with a conductive gel and connected to the fish's nervous system via sensory cells.
- They also assist in navigation by detecting the Earth's magnetic field.
Review Questions
- Where are the ampullae of Lorenzini primarily located on cartilaginous fishes?
- What is the sensitivity range of the ampullae of Lorenzini to electric fields?
- How do ampullae of Lorenzini assist cartilaginous fishes in navigating their environment?
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Related terms
Electroreception: The biological ability to perceive natural electrical stimuli.
Lateral Line System: A sensory organ system in fish that detects water movements and vibrations.
Cartilaginous Fishes: Fish species characterized by having a skeleton made mostly of cartilage rather than bone.
