Question

Cavity present in the spinal cord is termed as
(a) Central canal
(b) Fourth ventricle
(c) Volkmanns canal
(d) Iter

Answer 1

Hint: The cavity present within the vertebrate central nervous system containing the spinal cord channel and the brain ventricles in the spinal cord is often referred to as neurocoel or ependymal tube. This cavity is the adult remainder of the central neural tube cavity. Typically it occludes with age (closes off) .

Complete answer:
The fourth present ventricle between the brainstem and cerebellum is called the metacoel. It continues to form the cavity of the spinal cord filled with the cerebrospinal fluid, in the form of the central canal.
The Volkmann's canal lies in the long bones. They are one of the small channels in the bone that transmits blood vessels into the bone from the periosteum and interacts with the Haversian canals.
Iter binds the third ventricle with the fourth ventricle. It is called the cerebral aqueduct of the Sylvius, or cerebral aqueduct.
The central canal is found in the cervical and thoracic areas, in the anterior third of the spinal cord. It enlarges in the lumbar spine, which is more centrally located. It is more subsequently situated at the conus medullaris, where the spinal cord tapers.
So, the correct answer is, 'Central canal'..

Note: The central canal is located below in the brain's ventricular system, starting at an area called the obex where the fourth ventricle, a cavity in the brainstem, narrows. It absorbs fluid from the cerebrospinal and shares the same ependymal lining. The central channel helps bring nutrients through the spinal cord and protects it by cushioning the effect of a force while the spine is affected.