The difference between brain and spinal cord lies in their respective functions and anatomical locations within the central nervous system. The brain and spinal cord are components of the central nervous system (CNS) and play important roles in controlling and coordinating processes in the human body.
In this article, we will cover the difference between brain and spinal cord in detail.
Table of Content
Brain
The brain is a part of the CNS. It is the most complex organ and is present in the head region of the human body. It is known as the 'control centreThe cranium' of the body as it controls all the activities of the body. The brain is protected by a cranium/brain box which is made up of 8 bones. Cranium is a part of the skull. Also, it is covered by three cranial meninges, namely, Dura mater, Arachnoid, and Pia mater.
From the brain, 12 pairs of cranial nerves arise. These nerves can be sensory, motor, and mixed. The whole Brain except the medulla region contains grey matter in the outer region and white matter in the inner region. Cerebrospinal Fluid (CSF) is produced in the ventricles of the brain. The CSF within the brain is present within the ventricles and the subarachnoid space.
Brain Parts
There are 3 major brain parts:
- Cerebrum: This is the largest part of the brain and is responsible for higher functions such as thinking, learning, memory, and voluntary movements. It is divided into two hemispheres, each controlling the opposite side of the body.
- Cerebellum: Located beneath the cerebrum, the cerebellum plays a crucial role in co-ordinating voluntary movements, balance, and posture. It also assists in motor learning and cognitive functions related to movement.
- Brainstem: Situated at the base of the brain, the brainstem regulates basic life functions such as breathing, heart rate, blood pressure, and consciousness. It consists of the midbrain, pons, and medulla oblongata, which serve as pathways for nerve signals traveling between the brain and the rest of the body.
Spinal Cord
The spinal cord is also a part of the CNS. It is a long, narrow, tubular structure present on the dorsal side and runs through the neural canal from the neck to the lower back of the human body. The spinal cord carries messages between the brain and the rest of the body. It is protected by the vertebral column which is made up of 26 vertebrae.
It is also covered by three meninges, namely, Dura mater, Arachnoid, and Pia mater. From the Spinal cord, 31 pairs of spinal nerves arise. All spinal nerves are mixed in nature. The spinal cord and medulla region of the brain contains white matter in the outer region and grey matter in the inner region. CSF is present in the central canal that runs through the center of the spinal cord. The spinal cord is divided into four regions- Cervical, Thoracic, Lumbar, and Sacral.
Also Read: What is Spinal Cord? Diagram, Anatomy and its Functions
Spinal Cord Function
The various functions of spinal cord are:
- Transmitting sensory information from the body to the brain.
- Transmitting motor commands from the brain to the body.
- Facilitating reflex actions without involvement of the brain.
- Serving as a pathway for communication between the brain and peripheral nerves.
- Playing a role in coordination of movement and posture.
Difference Between Brain and Spinal Cord
Differences between the Brain and Spinal Cord are as follows:
Features | Brain | Spinal Cord |
|---|---|---|
Location | Present in the head region | Runs through the neural canal from the neck to the lower back |
Structure | Divided into three parts: Forebrain, Midbrain, Hindbrain | Divided into four regions: Cervical, Thoracic, Lumbar, Sacral |
Functions | Controls almost all body activities including thoughts, beliefs, memories, emotions, appetite, sensations, and involuntary actions | Carries messages between the brain and the rest of the body |
Nerves | 12 pairs | 31 pairs |
| Types of nerves | Sensory, motor, and mixed nerves | Only mixed nerves |
Matter Composition | Grey matter in the outer region and white matter in the inner region | White matter in the outer region and grey matter in the inner region |
Cerebrospinal Fluid (CSF) | Produced in the ventricles of the brain and present within the ventricles and the subarachnoid space | Present in the central canal that runs through the center of the spinal cord |
Based on the locations and functions, the Nervous System is classified into Central Nervous System (CNS) and Peripheral Nervous System (PNS). CNS consists of Brain and Spinal cord while PNS consists of different types of nerves for transmitting messages.
Similarities Between the Brain and Spinal Cord
Below are some similarities between the brain and the spinal cord:
- Both are parts of the Central Nervous System (CNS): The brain and spinal cord are components of the CNS.
- Protected by meninges: Both are covered and protected by three layers of meninges: the Dura mater, Arachnoid, and Pia mater.
- Carry nerve signals: Both the brain and spinal cord play an important role in transmitting messages throughout the body.
- Composed of grey and white matter: Both the brain and spinal cord contain regions of grey matter and white matter.
- Cerebrospinal fluid: The brain and spinal cord contain cerebrospinal fluid. CSF helps in protecting these structures.
Conclusion - Difference Between Brain and Spinal Cord
In conclusion, the difference between brain and spinal cord lies in their function. Brain and spinal cord are integral components of the central nervous system (CNS), each with distinct functions and structures. While the brain controls higher cognitive functions and involuntary actions, the spinal cord facilitates communication between the brain and peripheral nerves and coordinates reflex actions. Both are protected by meninges and contain regions of grey and white matter. Understanding the roles and differences between these structures is crucial for comprehending the complexities of the nervous system.
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