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O. LARSELL, PH.D.; EDWARD MCCRADY, JR., PH.D.; LIEUTENANT JOHN F. LARSELL

Arch Otolaryngol. 1944;40(4):233-248.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

The membranous labyrinth of the opossum Didelphis virginiana is still in a relatively early stage of development at birth and is entirely nonfunctional. This opossum is born thirteen days after fertilization and completes its development in the brood pouch of the mother. At the time it is born most of its organs are very embryonic, but by fifty days post partum it has reached a stage of development approximating that of most newborn mammals (McCrady¹). The opossum in the pouch, therefore, provides embryonic material easy of access for experimental purposes.

Langworthy² noted the earliest sign of vestibular response in pouch young at 41 days, while Larsell, McCrady and Zimmermann³ reported such responses at about 43 days. Acoustic function does not appear until about a week later. Larsell and McCrady⁴ and Larsell, McCrady and Zimmermann reported acoustic responses in the form of a spasmodic contraction of trunk musculature in pouch young . . . [Full Text PDF of this Article]

Author Affiliations
PORTLAND, ORE. SEWANEE, TENN.; MEDICAL CORPS, ARMY OF THE UNITED STATES

From the University of Oregon Medical School (Drs. O. Larsell and John F. Larsell) and the University of the South (Dr. McCrady).

Footnotes
Read at the meeting of the American Academy of Ophthalmology and Otolaryngology, in Chicago, Oct. 14, 1943.

The American Academy of Ophthalmology and Otolaryngology made possible the completion of this research by a grant from the research committee of its council.

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