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At least 127 records · Page 7Linked to original sources
PubMed2001

Structural characteristics of the patagium of Ptychozoon kuhli (Reptilia: Gekkonidae) in relation to parachuting locomotion.

Ptychozoon kuhli is known for its parachuting/gliding capabilities. In this contribution, we document the allometric scaling properties of its patagium, accessory flaps and folds, and its total body surface area and compare them to similar attributes of the agamine lizard Draco volans. Ptychozoon kuhli has passive patagia that lack skeletal support and muscular control. Patagial area in P. kuhli is smaller than that in D. volans for individuals of identical snout-vent length, but the accessory folds and flaps compensate for this shortfall and overall P. kuhli has equivalent total body surface area to D. volans for equally sized individuals. The structure of the patagium of Ptychozoon kuhli was investigated in terms of its scalation patterns and structural integrity, its relationship to the body wall and its mechanism of erection, and the distribution of mechanoreceptive sensilla across its surface. Scalation patterns and the internal architecture of the patagium indicate how its shape and form are maintained as it erects and becomes exposed to air flow. Its cross-sectional shape, together with that of the entire body indicates how it is able to behave as an airfoil. The distribution of sensilla across the patagial surface reflect positioning indicative of the monitoring of scale-to-scale contact on the dorsal surface, and possibly air pressure and flow on the ventral surface.

Animals↗
PubMed1993

Parachute-like sinus venosus remnant: echocardiographic and pathological appearance.

A female infant with multiple congenital abnormalities and a right atrial "mass" on echocardiography is reported. Her general condition at birth was poor, and the chest x-ray showed cardiomegaly. Echocardiography demonstrated the usual atrial arrangement and concordant atrioventricular and ventriculoarterial connections with a mobile right atrial mass. Death occurred at 3 days of age and subsequent postmortem examination revealed a hollow, tube-like sinus venosus remnant mobile between right atrium and ventricle with numerous other abnormalities of the heart, including left heart hypoplasia and tubular hypoplasia of the aortic arch. Filling of the sinus venosus remnant with blood had resulted in an echocardiographic appearance suggestive of a right atrial tumor.

Asphyxia Neonatorum↗
PubMed1990

Single papillary muscle ("parachute valve") and double-orifice left ventricle in atrioventricular septal defect convergence of chordal attachment: surgical anatomy and results of surgery.

A review of 59 anatomical specimens and of the findings in 65 surgically repaired patients with atrioventricular septal defect (AVSD), revealed four patients with a single papillary muscle and 11 with a double-orifice left ventricle. A single papillary muscle of the left ventricle occurred in 1.7% (1 of 59) of the anatomical specimens, and 6% (4 of 65) of the surgical cases. A double orifice of the left ventricle was found in 13.6% (8 of 59) of the anatomical specimens, and 7.7% (6 of 65) of the surgical cases. A single papillary muscle was only seen in cases with a complete defect. Double orifice was associated with partial, complete, or intermediate type of defect, with the highest incidence in the intermediate forms: 40% (4 of 10) of the anatomical specimens and 22% (2 of 9) of the surgical cases. In the anatomical study the specimens, with either single papillary muscle or double-orifice left ventricle, appear to be variants of the same malformation characterized by convergence of chordal insertion and underdevelopment of the left lateral leaflet. Pathology belonging to this spectrum was seen in 15% of our autopsy specimens and 14% of the surgical cases. In the surgical series good operative results were obtained with a conservative approach in cases with a favorable surgical anatomy.

Adolescent↗