convergence
Definition
In the context of anatomy and physiology, specifically during the cranial nerve exam, convergence refers to the coordinated movement of both eyes inward to focus on a near object. It is a crucial aspect of the neurological examination that assesses the functionality of certain cranial nerves.
Analogy
Imagine using binoculars to watch a bird that is moving closer to you. As the bird comes nearer, you adjust the lenses so they move closer together, allowing you to maintain a clear focus on the bird. This adjustment mirrors how your eyes converge to maintain focus on nearby objects, utilizing the brain's commands and muscle coordination in a similar way.
Related terms
Cranial Nerves: Twelve pairs of nerves that emerge directly from the brain, not through the spinal cord, and are responsible for sensory and motor functions related to head and neck regions.
Oculomotor Nerve: The third cranial nerve responsible for controlling most of the eye's movements including convergence and lens accommodation.
Accommodation: The process by which the eye changes optical power to maintain a clear image or focus on an object as its distance varies
Are you a college student?
Study guides for the entire semester
200k practice questions
Glossary of 50k key terms - memorize important vocab
Resources
© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.