Accession Number:

AD0806402

Title:

AN ANALYSIS OF CEREBRAL CONTROL OF REFLEX PUPILLARY DILATATION IN THE CAT,

Descriptive Note:

Corporate Author:

ARMY MEDICAL RESEARCH LAB FORT KNOX KY

Personal Author(s):

Report Date:

1948-07-15

Pagination or Media Count:

12.0

Abstract:

The objects of this project were to determine 1 whether the sympathetic andor parasympathetic systems are active in controlling reflex pupillary dilatation following cerebral excitation, 2 the course which the reflex pathways follow, and 3 the degree of activity of the pupillary light reflex during stimulation of cerebral pupillodilator areas. In fourteen experiments following excitation of the gyri proeus, genualis and subcallosus, a bilateral 2-5 mm. reflex pupillary dilatation occurred due to inhibition of parasympathetic activity. Hypothalamic stimulation caused a 6-8 mm. reflex mydriasis due to sympathetic activity. Evidence suggests that the reflex fibers originating in the gyri proeus, genualis and subcallosus pass through the hypothalamus to the Edinger-Westphal nucleus. The light reflex was abolished during the excitation of the cerebral pupillodilator areas but reappeared following the disappearance of the pupillary dilatation. Author

Subject Categories:

  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE