Tract of spinal cord consist of bundles of medullated nerve fibers in the dorsal, lateral or ventral white columns or funiculi of the white mater of spinal cord. The fibers having similar origin, termination and function are grouped together and are called as tracts or fasciculi. Tract of spinal cord may be classified as- Sensory […]
These Ventricles of Brain is present in the brain- Lateral ventricle, Third ventricle, and Fourth ventricle. LATERAL VENTRICLES They are right and left and each is an irregular cavity in the interior of each cerebral hemisphere communicating with each other and with the third ventricle by the foramen of Munro. Each ventricle has three parts,
Medulla Oblangata is the cranial continuation of the spinal cord and extends from the foramen magnum to the posterior margin of the pons. This is a quadrilateral structure wider in front than behind and compressed dorsoventrally. Its inferior surface is convex transversely and presents median fissure, which ends in front in a small depression called
The pons is located between the medulla oblongata and the cerebral peduncles. Pons is marked off from these ventrally by the anterior and the posterior transverse grooves. When viewed ventrally it is elongated, convex in both directions and presents a median groove, which lodges the basilar artery. Laterally a large part of it curves dorsally
The cerebellum or lesser brain is separated from the cerebral hemispheres by the great transverse fissure. It overlies the pons and greater part of the medulla oblongata and the fourth ventricle. It is globular in shape and compressed dorso-ventrally. The surface of the cerebellum is cut into gyri by narrow but deep sulci into which
Hindbrain is made up by these three parts of brain- Cerebellum Pons Medulla Oblangata
Cerebral peduncles are two broad bundles situated at the lower part of the midbrain and appear on the ventral face of the brain as two columns that emerge from under the pons and diverge forward to enter the cerebrum. At the point of disappearance, the optic tract winds obliquely across the peduncle. These contain the
The cerebral aqueduct or aqueduct of Sylvius is a narrow passage through the mesencephalon and connects the third and fourth ventricles. It is situated at the median plane. The shape of the lumen is variable at different places. It is lined by ciliated columnar epithelium. Surrounding it is a layer of gray mater which is
Corpora Quadrigemina are four rounded eminences, which form the upper part of the midbrain and lie under posterior part of the cerebral hemispheres. They consist of two parts of colliculi (anterior and posterior)separated by a transverse groove. The anterior colliculi are larger and placed higher in level than the posterior and are known as nates.
Midbrain made up of these parts of brain- Corpora Quadrigemina Cerebral aqueduct Cerebral peduncles
