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The midbrain or mesencephalon is the rostral -most portion of the brainstem [ 2] connecting the diencephalon and cerebrum with the pons. [ 3] 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 brainstem (or brain stem) is the stalk-like part of the brain that connects the forebrain (the cerebrum and diencephalon) with the spinal cord. [ 1] In the human brain, the brainstem is composed of the midbrain, the pons, and the medulla oblongata. [ 1][ 2] The midbrain is continuous with the thalamus of the diencephalon through the ...
In neuroanatomy, the superior colliculus (from Latin 'upper hill') is a structure lying on the roof of the mammalian midbrain. [ 1] In non-mammalian vertebrates, the homologous structure is known as the optic tectum or optic lobe. [ 1][ 2][ 3] The adjective form tectal is commonly used for both structures. In mammals, the superior colliculus ...
The inferior colliculus ( IC) ( Latin for lower hill) is the principal midbrain nucleus of the auditory pathway and receives input from several peripheral brainstem nuclei in the auditory pathway, as well as inputs from the auditory cortex. [ 1] The inferior colliculus has three subdivisions: the central nucleus, a dorsal cortex by which it is ...
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. Being the most specialized organ, it is responsible for ...
The periaqueductal gray is the gray matter located around the cerebral aqueduct within the tegmentum of the midbrain. It projects to the nucleus raphe magnus, and also contains descending autonomic tracts. The ascending pain and temperature fibers of the spinothalamic tract send information to the PAG via the spinomesencephalic tract (so-named ...
Unlike the midbrain tectum (which is a sensory structure located posteriorly), the midbrain tegmentum, which locates anteriorly, is related to a number of motor functions. Within the tegmentum, the red nucleus is in charge of motor coordination (specifically for limb movements) and the periaqueductal gray matter (PAG) contains critical circuits ...
62394. Anatomical terms of neuroanatomy. [ edit on Wikidata] 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) nerve tracts ...