What innervates the muscle (m.) sphincter pupillae?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: May 9, 2025View editorial policy

Personalize

Help us tailor your experience

Which best describes you? Your choice helps us use language that's most understandable for you.

From the Guidelines

M. sphincter pupillae, oculomotor nerve (cranial nerve III)'in parasympathetic liflerinin innervasyonuna sahiptir. Bu parasympathetic lifler, midbrain'deki Edinger-Westphal nükleusundan kaynaklanır, oculomotor sinir ile seyahat eder ve ciliary ganglionda sinaps yapar [ 1 ]. Post-ganglionic lifler daha sonra kısa ciliary sinirleri aracılığıyla iris'teki m. sphincter pupillae kasına ulaşır. Bu sinir lifleri aktive edildiğinde, m. sphincter pupillae kası kasılır ve pupiller konstriksiyon (miosis) oluşur. Bu, pupillary ışık refleksi ve akomodasyon refleksinin önemli bir bileşenidir. Oculomotor sinir veya parasympathetic bileşeninin hasarı, pupillary dilatasyona ve ışık karşısında konstriksiyonun bozulmasına neden olabilir, bu da nörolojik muayenelerde önemli bir klinik bulgu olabilir.

Aşağıdaki noktalar, m. sphincter pupillae'nin innervasyonunu daha iyi anlamamıza yardımcı olur:

  • Oculomotor nerve (cranial nerve III), midbrain'den orbit'e kadar uzanan bir yol izler [ 1 ].
  • Oculomotor nerve, cavernous sinus içinde superior ve inferior divisions'a ayrılır [ 1 ].
  • Inferior division, parasympathetic lifler gönderir ve ciliary ganglion, pupillary sphincter, intrinsic muscles controlling accommodation, inferior oblique, medial rectus ve inferior rectus'u innerve eder [ 1 ].

From the Research

M. Sphincter Pupillae'nin Innerve Edilmesi

  • M. sphincter pupillae, iris sphincter kasını innerve eden sinirlerdir.
  • Bu kas, gözbebeğinin küçülmesini sağlar ve parasympatik sinir sistemine bağlıdır 2.
  • Edinger-Westphal nucleus, parasympatetik preganglionic nöronları içerir ve these nöronlar, oculomotor siniri aracılığıyla ciliary gangliyona projekte edilir 2.
  • Ciliary ganglion, internal musculature of the eye'yi innerve eder; bu da ciliary body, iris sphincter kası ve choroidal blood vessels'i içerir 2.
  • Iris sphincter kası, EWl (lateral Edinger-Westphal nucleus) hücrelerinden gelen inputları alır 2.
  • Ayrıca, accessory oculomotor nuclei (AON) ve periaqueductal gray (PAG) de Edinger-Westphal nucleus'a projekte edilir ve pupillary light reflex'i etkiler 3.

Related Questions

What is the Edinger-Westphal nucleus (Edinger-Westphal nucleus, a part of the oculomotor nerve complex)?
Is Glucagon-like peptide-1 (GLP-1) receptor agonist therapy, such as tirzepatide, a suitable treatment option for a 50-year-old female with a BMI of 22.9 and a 20-pound weight gain over 2 years, despite regular exercise and a healthy diet?
What is the term for an error caused by an anaesthetist (anesthesiologist) placing two different medications with the same shape and colour on a drug preparation shelf?
What are the potential effects of the ResM GLP-1 Postbiotic supplement on the general health and weight loss of a patient with potential underlying conditions, such as Impaired renal function, considering its high doses of Vitamin B12 and Chromium?
What is the recommended approach for a 28-year-old male with a history of diverticulitis, colostomy, abdominal hernia, and prediabetes, weighing 526lbs, who wants to start a GLP-1 (Glucagon-Like Peptide-1) receptor agonist, such as liraglutide (Victoza) or semaglutide (Ozempic), for weight loss?
What is the equivalent dose of Mounjaro (tirzepatide) for a patient currently taking Ozempic (semaglutide) 2mg weekly?
What vaccinations are recommended post orthotopic liver transplant (OLT)?
What are the recommendations for Herpes Zoster (shingles) vaccination post Orthotopic Liver Transplantation (OLT)?
What is the treatment for an infected groin abscess that developed from shaving and popping a carbuncle (boil)?
What is the relationship between Mast Cell Activation Syndrome (MCAS) and acute appendicitis?
What is nystagmus?

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.