Meridional fibers of ciliary muscle
Fibrae meridionales musculi ciliaris
- Latin synonym: Fibrae longitudinales
- Synonym: Longitudinal fibres; Longitudinal fibers
- Latin eponym: Fibrae Bruecke
- Eponym: Brücke's muscle
- Related terms: Meridional fibres; Meridional fibers
Definition
The meridional fibres of ciliary muscle are the outermost fibres of this muscle. They run anteroposteriorly and are attached to the scleral spur anteriorly. The scleral spur is closely related to the scleral sulcus in front and medial to it and houses the trabecular meshwork. Therefore
Function
Therefore contraction of the meridional fibres pull the scleral spur posteriorly, which opens up the trabecular meshwork and canal of Schlemm, hence facilitating aqueous humour outflow. Thus, they are more important for fluid drainage than direct accommodation.
References
BorgesGiampani, A.S. and Giampani Junior, J., 2013. Anatomy of ciliary body, ciliary processes, anterior chamber angle and collector vessels. In: S. Rumelt (ed.) Glaucoma: Basic and Clinical Aspects. London: IntechOpen. Available at: https://doi.org/10.5772/52780
Standring, S. (Ed.). (2015). Eye (Chapter 42). In Gray's anatomy: The anatomical basis of clinical practice (41st ed., pp. 686706). Churchill Livingstone.
