structure and function of spinal cord pdf

Structure And Function Of Spinal Cord Pdf

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Published: 23.04.2021

Spinal cord

The spinal cord is a long bundle of nerves and cells that extends from the lower portion of the brain to the lower back. It carries signals between the brain and the rest of the body. This article covers the key anatomy of the spinal cord and its functions. Below is a 3D model of the spinal cord, which is fully interactive. Explore the 3D model using your mouse pad or touchscreen to understand more about the spinal cord.

Transmission of nerve impulses. Neurons in the white matter of the spinal cord transmit sensory signals from peripheral regions to the brain and transmit motor signals from the brain to peripheral regions. Spinal reflexes. Neurons in the gray matter of the spinal cord integrate incoming sensory information and respond with motor impulses that control muscles skeletal, smooth, or cardiac or glands. Here, the spinal cord comes to a tapering point, the conus medullaris. The spinal cord is held in position at its inferior end by the filum terminale, an extension of the pia mater that attaches to the coccyx. Along its length, the spinal cord is held within the vertebral canal by denticulate ligaments, lateral extensions of the pia mater that attach to the dural sheath.

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Spinal Cord Injury Model System. What does the spinal cord do? What is a spinal cord injury? What causes spinal cord injury? What is paralysis? What is paraplegia? What is tetraplegia?

Your spine, or backbone, is your body's central support structure. It connects different parts of your musculoskeletal system. Your spine helps you sit, stand, walk, twist and bend. Back injuries, spinal cord conditions and other problems can damage the spine and cause back pain. A healthy spine has three natural curves that make an S-shape. These curves absorb shocks to your body and protect your spine from injury. Many different parts make up your spine:.

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Spine Structure and Function

The Structure and Functions of the Brain and Spinal Cord

Spinal nerves are the major nerves of the body. A total of 31 pairs of spinal nerves control motor, sensory, and other functions. These nerves are located at the cervical, thoracic, lumbar, sacral, and coccygeal levels.

The spinal cord is a long, thin, tubular structure made up of nervous tissue , which extends from the medulla oblongata in the brainstem to the lumbar region of the vertebral column. It encloses the central canal of the spinal cord, which contains cerebrospinal fluid. The brain and spinal cord together make up the central nervous system CNS. In humans , the spinal cord begins at the occipital bone , passing through the foramen magnum and entering the spinal canal at the beginning of the cervical vertebrae. The spinal cord extends down to between the first and second lumbar vertebrae , where it ends. The enclosing bony vertebral column protects the relatively shorter spinal cord. The spinal cord functions primarily in the transmission of nerve signals from the motor cortex to the body, and from the afferent fibers of the sensory neurons to the sensory cortex.

The Anatomy of Spinal Nerves

Spinal nerves, a part of the peripheral nervous system PNS , are mixed nerves that send motor, sensory, and autonomic signals between the CNS and the body. The term spinal nerve generally refers to a mixed spinal nerve that carries motor, sensory, and autonomic signals between the spinal cord and the body. Humans have 31 left—right pairs of spinal nerves, each roughly corresponding to a segment of the vertebral column: eight cervical spinal nerve pairs C1—C8 , 12 thoracic pairs T1—T12 , five lumbar pairs L1—L5 , five sacral pairs S1—S5 , and one coccygeal pair. The spinal nerves are part of the peripheral nervous system PNS. A spinal nerve : Spinal nerves arise from a combination of nerve fibers from the dorsal and ventral roots of the spinal cord.

The spinal cord is a complex cylinder of nerves that starts at the base of your brain and runs down the vertebral canal to the backbone. These roots are referred to as the dorsal which is towards the back and the ventral which is away from the back roots. We depend on the spinal column to be the main support of our body. It allows us to stand upright, bend, and twist while protecting the spinal cord from injury.

Nachum Dafny, Ph. Figure 3. The spinal cord is the most important structure between the body and the brain.


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