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Butterfly vertebra (also known as sagittal cleft vertebra) is a rare congenital spinal anomaly characterized by the presence of a sagittal cleft within a vertebral body, giving it a butterfly-like appearance on imaging. This condition arises due to incomplete fusion of the lateral halves of a vertebra during embryonic development.
Butterfly vertebrae have a sagittal cleft through the body of the vertebrae and a funnel shape at the ends. This gives the appearance of a butterfly on an x-ray . It is caused by persistence of the notochord (which usually only remains as the center of the intervertebral disc ) during vertebrae formation.
Diastematomyelia is a "dysraphic state" of unknown embryonic origin, but is probably initiated by an accessory neurenteric canal (an additional embryonic spinal canal.).) This condition may be an isolated phenomenon or may be associated with other segmental anomalies of the vertebral bodies such as spina bifida, kyphoscoliosis, butterfly vertebra, hemivertebra and block vertebrae which are ...
Other presentations of Alagille's syndrome include butterfly vertebrae, ophthalmic defects, and distinct facial structures. The butterfly vertebrae can be detected with an x-ray, but there typically are no symptoms from this abnormality. Other skeletal defects common in ALGS patients are spina bifida and the fusion of vertebrae. [10]
The sphenoid bone of humans is homologous with a number of bones that are often separate in other animals, and have a somewhat complex arrangement. In the early lobe-finned fishes and tetrapods, the pterygoid bones were flat, wing-like bones forming the major part of the roof of the mouth. Above the pterygoids were the epipterygoid bones, which ...
A monarch butterfly feeding on milkweed. (Shutterstock) The U.S. Fish and Wildlife Service is pushing for added protections for the monarch butterfly after seeing a population decline of about 80%.
A gynandromorph can have bilateral symmetry—one side female and one side male. [24] Alternatively, the distribution of male and female tissue can be more haphazard. Bilateral gynandromorphy arises very early in development, typically when the organism has between 8 and 64 cel
To get into the position, the receiving partner lies down on their back, on a flat surface (think: a bed, table, etc.), with their butt in the air, and usually with their legs spread open and bent ...