the horn of spinal cord that picks up sensation from various organs
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The brain and spinal cord make up the central nervous system. The spinal cord, simply put, is an extension of the brain. It is an ovoid shaped column of nerve tissue that extends from the brain down to the second lumbar vertebrae. It allows us to control our arms, legs, and our bathroom habits, among many other things.
The spinal cord is enclosed in protective tissues called the meninges. The meninges form a protective sack around the spinal cord. Within the spinal (or dural) sac, the spinal cord is surrounded by a nourishing fluid called cerebrospinal fluid. The dural sac is further protected by the bones of the spinal column.
The internal anatomy of the spinal cord is quite complex. To keep things simple, the center of the cord consists of gray mater. White mater is arranged in tracts around the gray mater. It consists of axons that transmit impulses to and from the brain or between levels of gray mater within the spinal cord.
The spinal cord has two basic functions. The spinal cord carries sensory impulses to the brain (i.e. allows us to feel) and motor impulses (i.e. allows us to move our muscles) from the brain. The spinal cord also controls stretch reflexes and controls our bowel and bladder functions.
The spinal cord also acts as a nerve center between the brain and the rest of our body. Thirty-one pairs of nerves exit from the spinal cord to innervate our body.