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The midbrain or mesencephalon is the uppermost portion of the brainstem connecting the diencephalon and cerebrum with the pons. [2] It consists of the cerebral peduncles , tegmentum , and tectum . It is functionally associated with vision, hearing, motor control, sleep and wakefulness, arousal ( alertness ), and temperature regulation.
The mesencephalon is the second of the three primary vesicles, and does not further differentiate into a secondary brain vesicle. This will become the midbrain. This will become the midbrain. The third primary vesicle, the rhombencephalon (hindbrain) will further differentiate into two secondary vesicles, the metencephalon and the myelencephalon .
linke Bildhälfte: Prosencephalon, Mesencephalon und Rhombencephalon. Dieses sogenannte "Dreibläschenstadium" wird ungefähr in der 4. Dieses sogenannte "Dreibläschenstadium" wird ungefähr in der 4.
Unless stated otherwise, this image is from the 20th U.S. edition of Gray's Anatomy of the Human Body, originally published in 1918 and therefore lapsed into the public domain. A copy of Gray's Anatomy can be found on Bartleby and also on Yahoo!.
PET image of the human brain showing energy consumption The brain consumes up to 20% of the energy used by the human body, more than any other organ. [ 131 ] In humans, blood glucose is the primary source of energy for most cells and is critical for normal function in a number of tissues, including the brain. [ 132 ]
The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals.It consists of nervous tissue and is typically located in the head (cephalization), usually near organs for special senses such as vision, hearing and olfaction.
The cerebral peduncles (In Latin, ped-means 'foot'.) are the two stalks that attach the cerebrum to the brainstem. [1] They are structures at the front of the midbrain which arise from the ventral pons and contain the large ascending (sensory) and descending (motor) tracts that run to and from the cerebrum from the pons.
Location of the human cerebrum (red). The cerebrum is the largest part of the brain. Depending upon the position of the animal, it lies either in front or on top of the brainstem. In humans, the cerebrum is the largest and best-developed of the five major divisions of the brain.