Which form involves nerve tissue fully exposed?

Which form involves nerve tissue fully exposed?

• A. Meningocele
• B. Myelomeningocele
• C. Myeloschisis
• D. Occulta

Answer: (C)

The key idea is how much neural tissue is exposed to the outside. Myeloschisis is the form where the neural tissue is completely exposed with no skin or meninges covering it. This happens when the neural tube fails to close properly along the back, leaving a raw, open surface of nerve tissue on the spinal region. Because there’s no protective covering, this form carries a high risk of infection and severe neurological injury. In contrast, occulta is a hidden defect with no outward protrusion or exposed tissue; meningocele involves meninges (and cerebrospinal fluid) protruding through a vertebral defect forming a sac, usually with some protective coverings, and myelomeningocele also has protrusion of meninges and spinal cord within a sac, but neural tissue is not fully exposed to the outside.

The key idea is how much neural tissue is exposed to the outside. Myeloschisis is the form where the neural tissue is completely exposed with no skin or meninges covering it. This happens when the neural tube fails to close properly along the back, leaving a raw, open surface of nerve tissue on the spinal region. Because there’s no protective covering, this form carries a high risk of infection and severe neurological injury.

In contrast, occulta is a hidden defect with no outward protrusion or exposed tissue; meningocele involves meninges (and cerebrospinal fluid) protruding through a vertebral defect forming a sac, usually with some protective coverings, and myelomeningocele also has protrusion of meninges and spinal cord within a sac, but neural tissue is not fully exposed to the outside.