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प्रश्न
Describe T.S. of the spinal cord.
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उत्तर
T.S. of the spinal cord shows the following features:
- The spinal cord is externally covered by the three meninges (dura mater, arachnoid mater, and pia mater). It is cylindrical but dorsoventrally flattened.
- It shows deep ventral fissure and shallow dorsal fissure. From the dorsal fissure, there extends a thin sheet of connective tissue called the dorsal septum which extends inward.
- It shows a central space called the central canal. The central canal is continuous with the 4th ventricle of the brain and contains cerebrospinal fluid. The central canal is lined by a single layer of ependymal cells. The central canal is surrounded by inner, grey matter containing cytons or cell bodies of neurons.
- Two dorsolateral horns and two ventrolateral horns give an ‘H’-shaped appearance to the grey matter. Dorsal horns extend in dorsal roots, while ventral horns extend in ventral roots of spinal nerves. Grey matter is surrounded by the white matter which divides into three columns or funiculi on either side. These are dorsal funiculi, lateral funiculi and ventral funiculi.
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संबंधित प्रश्न
Distinguish between the following pair of words:
Cranial nerve and spinal nerve
Where is this located?
Meninges
Where is this located?
Ganglia
Spinal cord and sympathetic ganglion of autonomous nervous system are connected by ______________.
The diagram given below represents the spinal cord of a mammal, seen in a transverse section together with the nerves. Study the diagram and then answer the questions given below:
(i) Label the parts 1—8 indicated by guidelines.
(ii) What do the arrows indicate? What is the pathway indicated termed?
(iii) What type of nerve is shown in the diagram?
Mention, if the following statement is True or False
Spinal nerves are twelve pair
There are ______ pairs of cranial nerves and ______ pairs of spinal nerves.
Which statement is correct regarding spinal nerves in man?
Spinal nerves are usually ______
Given below is the transverse section of the spinal cord. Read the information below the diagram and fill in the blanks:
The spinal cord extends from the medulla oblongata of the brain and runs down through the whole length of the vertebral column. The spinal cord is covered by the meninges. It conducts impulses from the skin and muscles to the brain. It also conducts impulses from the brain to the muscles of the trunk and limbs.
The spinal cord is a part of the (a) ______ Nervous System. The grey matter in the picture given above consists of (b) ______ while the white matter consists of (c) ______. The spinal cord is concerned with the (d) ______ actions below the neck. (e) ______ is the bony structure that protects the spinal cord.
