Iris dilator muscle

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Iris dilator muscle
Iris, front view. (Muscle visible but not labeled.)
The upper half of a sagittal section through the front of the eyeball. ("Radiating fibers" labeled near center.)
Latin musculus dilatator pupillae
Gray's subject #225 1013
Origin:
Insertion:
Artery:
Nerve: superior cervical ganglion (sympathetics)
Action: dilates pupil
Antagonist: iris sphincter muscle
Dorlands/Elsevier m_22/12548821

The iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a muscle of the eye. It is innervated by the sympathetic system.

Sympathetic connections of the ciliary and superior cervical ganglia.

v • d • e
List of muscles of head and neck: the head
scalp/eyelid occipitofrontalis (occipitalis, frontalis) - orbicularis oculi - corrugator supercilii - depressor supercilii
extraocular levator palpebrae superioris - superior tarsal - rectus (superior, inferior, medial, lateral) - oblique (superior, inferior)
intraocular ciliary - iris dilator - iris sphincter
ear auriculares - temporoparietalis - stapedius - tensor tympani
nose procerus - nasalis (dilatator naris) - depressor septi nasi - levator labii superioris alaeque nasi
mouth levator anguli oris/depressor anguli oris - levator labii superioris/depressor labii inferioris - zygomaticus (major, minor) - mentalis - buccinator - orbicularis oris - risorius
mastication masseter - temporalis - pterygoid (lateral, medial)
tongue extrinsic (genioglossus, hyoglossus, chondroglossus, styloglossus) - intrinsic (superior longitudinal, inferior longitudinal, transversus, verticalis)
soft palate levator veli palatini - tensor veli palatini - musculus uvulae - palatoglossus - palatopharyngeus
pharynx pharyngeal constrictor (inferior, middle, superior) - stylopharyngeus - salpingopharyngeus
larynx cricothyroid - cricoarytenoid (posterior, lateral) - arytenoid - thyroarytenoid
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Retrieved from "http://en.wikipedia.org/wiki/Iris_dilator_muscle"
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