Concept explainers
Introduction:
The spinal cord is a collection of nerve tissue that arises from the brain stem. It is a site that contains many motor neurons, interneurons, and complex neural circuits. It is often called as ‘nuts and bolts’ of the nervous system. It controls and enables the forces on muscles and its adaptive movements. The nervous tissue of the spinal cord is composed of organized cells that involve the body movements and send the signals to different parts of the body. The spinal cord tracts are stimulatory nerve pathways that pass the information through action potentials. The spinal tracts are important to diagnose and manage the spinal cord damages or injuries. It consists of two kinds of tracts namely ascending tracts and descending tracts.
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- Identify the origin of the accessory (XI) nerve in the spinal cord, the foramina through which it first enters and then exits the skull, and its function.arrow_forwardPlease identity the structures on the following diagram of a neural pathway through the spinal cord.arrow_forwardDescribe the basic location of a spinal nerve, and distinguish spinal roots from rami.arrow_forward
- A person with a spinal cord injury is suffering from paresis (partialparalysis) in the right lower limb. Which of these pathways is probably involved?a. left lateral corticospinal tractb. right lateral corticospinal tractc. left dorsal-column/medial-lemniscal systemd. right dorsal-column/medial-lemniscal systemarrow_forwardState and explain the three principal functions of the spinal cord.arrow_forwardSketch a cross section of the spinal cord showing the anterior and posterior horns. Where are the gray and white matter? Where are the columns and tracts?arrow_forward
- The cranial motor nuclei which receive innervation only from the contralateral corticobulbar tract are :-a- nuclei of the trigeminal and vagus nervesb- nuclei of the vagus and glossopharyngeal nervesc- nuclei of the facial and hypoglossal nervesd- nuclei of the facial and glossopharyngeal nervesarrow_forwardDescribe the distal (inferior) end of the spinal cord and the contents of the vertebral canal from level L2 through S5?arrow_forwardIdentify the origin of the hypoglossal (XII) nerve in the brain, the foramen through which it exits the skull, and its function.arrow_forward
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