Final answer:
The term 'Butterfly vertebra' describes a condition where the vertebral body does not ossify correctly, which may be noted as part of the broader conversation around conditions affecting the spine, such as spina bifida and osteoporosis-related kyphosis.
Step-by-step explanation:
The failure of the center of the vertebral body to ossify properly is referred to as a Butterfly vertebra.
Spina bifida is a birth defect of the spinal cord that occurs when the neural tube does not completely close. In some cases, this can lead to meninges and neural tissue emerging through the vertebral column. Fetal myelomeningocele, a severe form of spina bifida, can be observed in ultrasounds, as can the failure of vertebral ossification.
Osteoporosis is an age-related disorder that leads to the loss of bone density and strength, which can result in kyphosis, an excessive curvature of the thoracic region due to the collapse of the thoracic vertebrae. Developmental anomalies can also induce abnormal spinal curves. Vertebral development in humans involves the formation of vertebrae from hyaline cartilage models that grow and ossify through endochondral ossification.