Pupillary Reflex

Pupillary reflex refers to one of the reflexes associated with pupillary function.

Types include:

  • Pupillary light reflex
  • Accommodation reflex

See also:

  • Pupillary response

Although pupillary dilation is not usually called a "reflex", it is still usually considered a part of this topic.

Accommodation and vergence are also known as the "near response", while inhibition of the ciliary muscle is also known as the "far response".

Sensory system: Visual system and eye movement pathways
Visual perception 1° (Bipolar cell of Retina) → 2° (Ganglionic cell) → 3° (Optic nerve → Optic chiasm → Optic tract → LGN of Thalamus) → 4° (Optic radiation → Cuneus and Lingual gyrus of Visual cortex → Blobs → Globs)
Muscles of orbit
Tracking Smooth pursuit: Parietal lobe · Occipital lobe
Saccade: Frontal eye fields
Nystagmus → Fixation reflex → PPRF
Horizontal gaze PPRF → Abducens nucleus → MLF → Oculomotor nucleus → Medial rectus muscle
Vertical gaze Rostral interstitial nucleus → Oculomotor nucleus, Trochlear nucleus → Muscles of orbit
Vestibulo-ocular reflex Semicircular canal → Vestibulocochlear nerve → Vestibular nuclei → Abducens nucleus → MLF (Vestibulo-oculomotor fibers) → Oculomotor nucleus → Medial rectus muscle
Pupillary reflex
Pupillary dilation 1° (Posterior hypothalamus → Ciliospinal center) → 2° (Superior cervical ganglion) → 3° (Sympathetic root of ciliary ganglion → Nasociliary nerve → Long ciliary nerves → Iris dilator muscle)
Pupillary light reflex
(constriction)
1° (Retina → Optic nerve → Optic chiasm → Optic tract → Pretectal nucleus) → 2° (Edinger-Westphal nucleus) → 3° (Oculomotor nerve → Parasympathetic root of ciliary ganglion → Ciliary ganglion) → (4° Short ciliary nerves → Iris sphincter muscle)
Accommodation
vergence
1° (Retina → Optic nerve → Optic chiasm → Optic tract → Visual cortex → Brodmann area 19 → Pretectal area) → 2° (Edinger-Westphal nucleus) → 3° (Short ciliary nerves → Ciliary ganglion → Ciliary muscle)
Circadian rhythm Retina → Hypothalamus (Suprachiasmatic nucleus)

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Other articles related to "pupillary reflex, reflex":

Oculomotor Nerve - Testing - Pupillary Reflex
... Shining a light into one eye should result in equal constriction of the other eye ... The neurons in the optic nerve decussate in the optic chiasm with some crossing to the contralateral optic nerve tract ...
Vestibulo-oculomotor Fibers - See Also
... Vestibulo-ocular reflex Human brain, rhombencephalon, metencephalon pons (TA A14.1.05.101–604, GA 9.785) Dorsal/ (tegmentum) Surface Cerebellopontine angle · Superior medullary velum · Sulcus ...

Famous quotes containing the word reflex:

    No sooner does a great man depart, and leave his character as public property, than a crowd of little men rushes towards it. There they are gathered together, blinking up to it with such vision as they have, scanning it from afar, hovering round it this way and that, each cunningly endeavouring, by all arts, to catch some reflex of it in the little mirror of himself.
    Thomas Carlyle (1795–1881)