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Biomedical subjects

L Crane

Publications and source records attributed to L Crane.

27 records · Page 2Linked to original sources
PubMed1986

Developmental and seasonal changes in canary song and their relation to changes in the anatomy of song-control nuclei.

Young male canaries become sexually mature in late winter, 8-12 months after hatching. During the months between hatching and sexual maturity they develop adult song. The successive stages in the development of adult song are subsong, plastic song, and stable or full song. Once stable song is achieved it lasts for the duration of the breeding season. After the end of the breeding season there is a recurrence of song instability during summer and early fall. This plastic song is followed, once more, by stable song. New song syllables are added to the song of adult male canaries and some of the earlier syllables disappear. The song repertoire sung at 2 years of age is substantially larger, and different, from that sung during the first breeding season, when the birds were 1 year old. A comparable change occurs between the second and third breeding seasons. Most of the syllables acquired by adult males are formed during the summer-fall period of song instability. Developmental and seasonal changes in song are accompanied by anatomical changes in two forebrain nuclei known to be involved in song control, the hyperstriatum ventralis, pars caudalis (HVc), and the robust nucleus of the archistriatum (RA). HVc and RA grow during the subsong and plastic song periods of song development. These nuclei reach adult size by the time stable adult song is first produced, and retain this size during the breeding season. However, the size of HVc and RA diminishes by late summer, when it becomes comparable to that of a 3- to 4-month-old bird. This reduction in size is temporary and has been corrected by the following breeding season. It is suggested that these seasonal changes in volume reflect circuit changes which are under hormonal control, and that these changes are related to processes of learning and, possibly, forgetting. Despite earlier reports of left hemispheric dominance in canary song production, we failed to find any evidence of right-left systematic differences in the size of HVc and RA during development or in adulthood. Various hypotheses relating song learning to changes in the underlying anatomy are offered.

Animals↗
PubMed1981

Physical therapy for neonates with respiratory dysfunction.

Chest physical therapy for neonates with pulmonary dysfunction is a growing specialty of physical therapy practice. The purpose of this article is to provide physical therapists current information regarding chest physical therapy for the newborn infant. The neonatal diagnoses for which chest physical therapy is useful or has good rationale are discussed. Common complications are reviewed that affect physical therapy and medical treatment for infants with respiratory diseases and prematurity. Specific indications, contraindications, and precautions for physical therapy techniques are listed. Chest physical therapy evaluation and treatment are described and rationale for the application of various techniques is provided. Literature is reviewed dealing with the effects of chest physical therapy on neonates with pulmonary dysfunction. The strengths and weaknesses of each reviewed study are analyzed and suggestions for direction of future research for physical therapists are provided.

Adult↗
PubMed1977

Implications of the Donaldson decision: a model for periodic review of committed patients.

In 1976 the Connecticut Valley Hospital, the Yale University School of Law, and the department of psychiatry of the Yale School of Medicine, undertook a project in which all involuntary patients at the hospital, a total of 107, were reviewed by three interdisciplinary panels, each composed of a law student, a psychiatric resident, and a hospital social worker. The major purposes of the project were to identify those patients entitled to release under the Donaldson criteria, to develop a model review procedure, and to assess the need for alternative placements. The panels found no patients resembling Kenneth Donaldson, but they did find 53 per cent of the patients inappropriately detained on involuntary status. However, in most cases the recommendation was transfer to a nursing home because of the patient's high degree of disability. The authors emphaxize the importance of periodic external reviews of commitment status.

Activities of Daily Living↗
PubMed1975

Age-dependent cardiovascular effects of halothane anesthesia in neonatal pigs.

The cardiovascular effects of halothane anesthesia in a mixture of nitrous oxide and oxygen were studied on piglets 7 hr to 25 days of age. Blood pressure, heart rate and peripheral flows were recorded simultaneously in all animals. Body temperature and blood gas composition and pH were monitored and maintained within normal physiological limits for piglets. Inspired halothane concentration was kept at 1.0% during vascular surgery and then increased or decreased systematically. Halothane anesthesia depressed mean aortic pressure and increased carotid, femoral and renal resistances in piglets less than one week of age. These effects increased with increasing halothame concentrations from 0.25% to 1.5%. In older animals, mean aortic pressure changes were significant only at halothane concentrations above 1.0%, while peripheral resistances were unaffected. Although there was no concentration-dependent change in heart rate in either age group, heart rates were consistenly faster in younger animals.

Aging↗