Right cerebral aqueduct is surrounded by the periaqueductal gray and is found in between the tegmentum and the tectum. The cerebral aqueduct is the ventricular system’s smallest ventricle, but it plays an important role in continuing the flow of the cerebrospinal fluid. The cerebral aqueduct runs from the third ventricle to the fourth ventricle, as it is part of the ventricular system. Much like the superior colliculi, the inferior colliculi are connected to the corresponding medial geniculate nucleus, and they send information to them. Near the superior colliculi are the inferior colliculi, which are responsible for the processing of auditory information and are found just above the trochlear nerve. Both of the superior colliculi are linked to a respective lateral geniculate nucleus. The superior colliculi are linked with the nerves located in the neck. They also help control certain eye movements and interact with fibers of the optic nerve. The upper or superior to lobes are called the superior colliculi and they are responsible for the processing of visual information. Four lobes or lumps found on the tectum are referred to as the corpora quadrigemina. The tectum also gives inputs to the reticular spinal tract, which helps regulate our level of alertness. The tectum is the term given to the midbrain’s dorsal side, and it plays a role in reflex actions responding to auditory or visual stimuli. Photo: By Henry Vandyke Carter – Henry Gray (1918) Anatomy of the Human Body (See “Book” section below): Gray’s Anatomy, Plate 719, Public Domain, These regions are the tegmentum, the tectum, the cerebral aqueduct, and the cerebral peduncles. The midbrain can be divided into four different parts or regions. The midbrain is what controls your motor movement and reflexes, letting you respond appropriately to situations like that. For instance, if you accidentally touch your hand to a hot stove, your midbrain is what lets you jerk your hand back. Without the function of the midbrain, we wouldn’t be able to respond to threats or even move. The midbrain must be able to do all these things for us to survive. The midbrain also helps control our sleep/wake cycle, regulating our alertness. Dopamine is the “motivation” chemical of the body and it is responsible for our habits, behavior, attention, movement, and mood. The midbrain is also responsible for the regulation of dopamine production. Your midbrain is what lets you coordinate your actions and balance yourself, and it plays a major role in both auditory and visual reflexes. Your midbrain is what allows you to sit up at your computer or to look at your phone and read this. A closer look at the structure and function of the midbrain will help contextualize its role within the brain as a whole. The midbrain is comprised of many different parts. Voluntary movements are triggered by the rubrospinal tract, which runs from the cerebellum downwards to the spinal cord. The brain and spinal cord link together to enable the various functions of the midbrain. The midbrain is located above the hindbrain, the cerebral cortex, and situated near the center of the brain overall. The substantia nigra is part of the midbrain that is linked to the motor system located in the basal ganglia. The brain operates with assistance from the cerebral cortex, the cerebellum, and the substantia nigra. These functions are the regulation of temperature, control of vision and hearing, motor control, controlling the sleep-wake cycle, and arousal. The midbrain, also called the mesencephalon, has multiple functions.
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