Levator Palpebrae Superioris
Levator Palpebrae Superioris - Related Videos
09:14
Surgical Approach to Full Soft Tissue Face Allograft Procurement for Vascularized Composite Allotransplantation
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2025
This protocol details the surgical technique used to harvest and prepare a full-face allograft for transplantation in patients with severe facial disfigurements, focusing primarily on soft tissue procurement with limited bony harvest restricted to the nasal framework.
07:09
Subcutaneous Administration of Muscarinic Antagonists and Triple-Immunostaining of the Levator Auris Longus Muscle in Mice
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Cited by 7 •
2011
We describe procedures for repeated administration of inhibitors of muscarinic signaling to the levator auris longus (LAL) muscle of young adult mice and for subsequent immunostaining of its neuromuscular junctions (NMJs) in wholemounts. The LAL muscle has unique advantages for revealing in vivo pharmacological effects on NMJs.
10:45
Levator Auris Longus Preparation for Examination of Mammalian Neuromuscular Transmission Under Voltage Clamp Conditions
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Cited by 9 •
2018
The protocol described in this paper uses the mouse levator auris longus (LAL) muscle to record spontaneous and nerve-evoked postsynaptic potentials (current-clamp) and currents (voltage-clamp) at the neuromuscular junction. Use of this technique can provide key insights into mechanisms of synaptic transmission under normal and disease conditions.
04:44
Combined In Vivo Electroporation and Short-Term Reinnervation of the Cranial Levator Auris Longus Skeletal Muscle
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Cited by 1 •
2024
Here, we present a protocol that combines in vivo electroporation and denervation of the cranial levator auris longus (LAL) muscle. This procedure enables the study of the potential role of muscle-derived proteins in the regeneration of the neuromuscular synapse.
07:41
Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse
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Cited by 2 •
2019
Here we present a protocol to standardize the measurement of the levator ani hiatus size by magnetic resonance imaging. The purpose is to extract biomechanical inferences from image analysis by comparing resting and straining values in patients of both sexes with pelvic prolapse, using consistent anatomical bony landmarks.
FAQs
Its architecture converts shortening near the orbital apex into elevation at the lid. The muscle passes forward above the superior rectus, then broadens into an aponeurosis that attaches to the upper eyelid. This transition from muscle to aponeurotic attachment explains how force generated deeper in the orbit reaches the mobile eyelid.
Elevation depends on two neural inputs with different roles. Somatic motor fibers carried by the oculomotor nerve activate levator contraction, while sympathetic fibers to the superior tarsal muscle contribute additional eyelid elevation. This distinction matters because drooping can reflect impaired muscle performance or disrupted innervation, rather than one uniformly defined defect.
The course above the superior rectus places the levator within the superior part of the orbit and links its anatomy to structures relevant to gaze control. Mapping this relationship helps biology and clinical anatomy describe how eyelid elevation is organized in relation to eye-movement structures, without treating eyelid movement and ocular gaze as identical functions.
Ptosis can result when the Levator Palpebrae Superioris itself is impaired or when its innervation is disrupted. Reduced activation or reduced muscle function lessens the force available for upper-eyelid elevation, producing abnormal drooping. Clinically, eyelid position can therefore provide a visible clue to a problem involving either the contractile tissue or its neural control.
Studying the muscle connects structure with visible function: its origin and course explain how force reaches the eyelid, while its neural inputs provide context for activation. That framework supports analysis of eyelid movement, gaze control, and ptosis without reducing every abnormal lid position to a purely muscular problem.
Begin at its origin near the orbital apex, follow it forward above the superior rectus, and identify where it broadens into an aponeurosis attached to the upper eyelid. Then add its oculomotor somatic motor supply and the sympathetic contribution to the superior tarsal muscle. This sequence connects gross anatomy with activation and clinical relevance.