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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.
The central portion of the tympanic part is thin, as it gives rise to the bony inner two-thirds of the ear canal, and in 5 - 20% of skulls the lower surface is perforated by a hole, the foramen of Huschke [1] that opens onto the temporomandibular joint due to incomplete fusion of the anterior and posterior prominences during development.
Spina bifida (SB; /ˌspaɪnə ˈbɪfɪdə/, [9] Latin for 'split spine') [10] is a birth defect in which there is incomplete closing of the spine and the membranes around the spinal cord during early development in pregnancy. [1] There are three main types: spina bifida occulta, meningocele and myelomeningocele. [1]
This variation is usually present at the lower one-third of the sternal body.It has an oval shape and a unique "bow tie" appearance when seen on axial computed tomography.
In general abnormalities arise within the jaw when there is a disturbance or fault in the fusion of the mandibular processes. The mandible in particular has the most differential typical growth anomalies than any other bone in the human skeleton. This is due to variants in the complex symmetrical growth pattern which formulates the mandible. [1]
Incomplete fusion of the palatine raphe results in a congenital defect known as cleft palate. The pharyngeal raphe joins the left and right pharyngeal constrictors. The perineal raphe extends from the anus, through the mid-line of the scrotum (scrotal raphe), and upwards through the ventral mid-line aspect of the penis (penile raphe) in males.
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Programmed cell death at the joining surfaces enables fusion to take place. [22] In the middle of the fourth week, the sinus venosus receives blood from the three major veins: the vitelline, the umbilical and the common cardinal veins. During the first two months of development, the interatrial septum begins to form.