𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The eyelid levator muscle: Servant of two masters

✍ Scribed by Paul J. May; Robert G. Baker; Bingzhong Chen

Book ID
102502860
Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
296 KB
Volume
17
Category
Article
ISSN
0885-3185

No coin nor oath required. For personal study only.

✦ Synopsis

The levator palpebrae superioris muscle (henceforth, levator) plays an important role in two very different eyelid behaviors: lid saccades and blinks. During vertical saccades, the levator moves the upper eyelid out of the path of the pupil when looking up. When the eyes are open, the levator is tonically active to maintain position of the upper lid, so for blink down-phases it must be transiently turned off, while its antagonist, the orbicularis oculi muscle, closes the eye. Disorders in this system, including apraxia of lid opening and lid lag, can disrupt vision, but the causes of the disorders are unclear. 1,2 Consequently, we have investigated the circuitry that underlies this dual control in both the cat and macaque monkey. [3][4][5]

πŸ“œ SIMILAR VOLUMES

Accessory levator muscle of the upper ey
Accessory levator muscle of the upper eyelid: Case report and review of the literature
✍ Harold S. Amonoo-Kuofi; Hasem Hassan Darwish πŸ“‚ Article πŸ“… 1998 πŸ› John Wiley and Sons 🌐 English βš– 267 KB πŸ‘ 1 views

The authors describe a supernumerary muscle in each orbit of an elderly male subject. There appear to be no previous reports of this muscle; most reports of anomalies of extraocular muscles describe hypoplasia or aplasia. Thirty-five formalin-fixed cadavers assigned to medical students for dissectio

Clinical and electromyographic features
Clinical and electromyographic features of levator palpebrae superioris muscle dysfunction in involuntary eyelid closure
✍ Dr. M. Aramideh; B. W. Ongerboer de Visser; J. H. T. M. Koelman; L. J. Bour; P. πŸ“‚ Article πŸ“… 1994 πŸ› John Wiley and Sons 🌐 English βš– 753 KB

## Abstract We report on five patients with involuntary eyelid closure, diagnosed as blepharospasm and referred to us for treatment with botulinum A toxin. Synchronous electromyographic (EMG) recording was performed from the levator palpebrae superioris (LP) and the orbicularis oculi (OO) muscles.