The central nervous system, consisting of the brain and spinal cord, serves as the primary control network of the human body. During pregnancy, labor, and the neonatal period, this system undergoes significant assessment. Midwives evaluate neurological integrity to detect complications such as eclampsia, birth asphyxia, and congenital malformations like spina bifida. Understanding how neural structures regulate both maternal physiology and newborn adaptation forms a critical foundation for safe clinical practice across Nigerian maternity units.
The brain is divided into three major anatomical regions: the cerebrum, the cerebellum, and the brainstem. Protected within the skull and the bony vertebral column, the entire central nervous system is surrounded by protective membranes and fluid. The spinal cord extends downwards from the brainstem, acting as a major highway for sensory and motor signals travelling between the body and the brain.
The cerebrum is the largest part of the brain, split into left and right hemispheres, and is responsible for higher functions such as conscious thought, reasoning, and sensory processing. Beneath it lies the cerebellum, recognizable by its folded surface. The cerebellum coordinates voluntary movements, balance, and posture, ensuring smooth and precise physical actions.
The brainstem connects the cerebrum to the spinal cord and includes the midbrain, pons, and medulla oblongata. It manages essential autonomic survival functions that do not require conscious thought.
The spinal cord is housed within the vertebral canal and features an inner region of grey matter surrounded by white matter. Ascending tracts carry sensory information up toward the brain, while descending tracts relay motor commands from the brain to the peripheral nerves. Damage to specific segments of the cord interrupts these pathways, leading to sensory loss or paralysis below the level of injury.
The central nervous system is delicate and relies on robust protective layers. Three connective tissue membranes known as the meninges—the dura mater, arachnoid mater, and pia mater—envelope the brain and spinal cord. Additionally, cerebrospinal fluid circulates within the subarachnoid space and internal cavities, providing mechanical cushioning, chemical stability, and nutrient exchange for neural tissues.
In obstetric practice, neural integrity is paramount. Conditions like eclampsia involve central nervous system irritability leading to maternal seizures. In neonates, neural tube defects such as spina bifida occur when the spinal column fails to close properly during early embryonic development. Midwives must identify early warning signs of neurological distress to ensure prompt referral and multidisciplinary care.