The frontal lobe, parietal lobe, occipital lobe, and temporal lobe have been associated with different functions ranging from reasoning to. The temporal lobe is the region where sound is processed and, not surprisingly, it is also a region where auditory language and speech comprehension systems. Only primates have temporal lobes, which are largest in man, accommodating 17% of the cerebral cortex and including areas with auditory.
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The dominant temporal lobe, which is the left side in most people, is involved in understanding language and learning and remembering verbal information. The non-dominant lobe, which is typically the right temporal lobe, is involved in learning lobe temporal remembering non-verbal information e.
Damage to the temporal lobes can result in: The inferior surface of the uncus is crossed by an obscure transverse lobe temporal the lobe temporal of Giacomini, which represents the rostral end of the dentate gyrus.
Posteriorly the structure has a narrow horizontal body and a slender upwardly curved tail Figure 3. In modern usage it excludes the dentate gyrus and is memorialized in terminology for sectors seen in transverse coronal sections of the hippocampus, with CA1 next to the subiculum and CA4 in the concavity hilum of the dentate gyrus [ 2126 ].
The hippocampus, dentate gyrus and fimbria as they appear after removal of the roof of the temporal horn of the lateral ventricle and of the choroid plexus modified from Piersol, [ 27 ].
Brain Map: Temporal Lobes | Queensland Health
The lobe temporal on the right courtesy of Dr. Laszlo Seriss, Lobe temporal of Pecs, Hungary shows a dissected hippocampal formation, including the reflexed intrauncal lobe temporal, with a sea-horse alongside.
The choroid fissure is formed by invagination of the ependyma of the medial wall of the lateral ventricle and ingrowth of vascular tissue that will form the choroid plexus. In the temporal lobe, the fissure is alongside the hippocampus and fimbria, which form its inferior wall.
Temporal lobe | Radiology Reference Article |
Subcortical grey matter, the tail lobe temporal the caudate nucleus, forms the opposing wall of the fissure, along with an associated fibre bundle, the stria terminalis, which contains axons from the amygdala. In the adult human brain, the amygdala is near the temporal pole and indents tip of the temporal horn of the lateral ventricle, overlapping slightly with the more conspicuous indentation due to the hippocampus.
In a dissected adult brain with the lateral ventricle opened from above, the hippocampus is lobe temporal as the white floor inferomedial surface of the inferior horn.
The name pes hippocampi is still occasionally encountered for the anterior end of the hippocampus [ 2829 ].
The name hippocampus Latin lobe temporal sea-horse dates from lobe temporal Renaissance and a fancied resemblance to the fish Figure 3with its thin snout, flexed neck, plump body, and curved tail [ 30 ].
The curved shape of the hippocampus has been likened also to the horn of a ram cornu ammonisa shape that relates also to the appearance of a transverse section [ 31 ]. The architecture of the hippocampal formation is largely uniform throughout its length, as seen in transverse sections Figure 4.
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Most of the human cerebral cortex the isocortex has 6 layers, two of which contain principal cells: The cortex of the hippocampal formation, however, has the principal cells in just one layer allocortex.
The molecular layer, which is continuous with the most superficial layer of the isocortex of the parahippocampal gyrus, consists largely of axodendritic synapses and is adjacent to the vestigial hippocampal sulcus.
In the dentate gyrus this is quite a thin layer, but lobe temporal the hippocampus it is thick, with 4 sublayers, the stratum molecular, stratum lacunosum, stratum radiatus, and stratum lucidum, which contain synapses from lobe temporal groups of afferent fibres. The layer of principal cells in the hippocampus is called the stratum pyralidae; it contains neurons whose sectioned somata have triangular outlines and large apical dendrites that extend into the molecular layer.
lobe temporal In the dentate gyrus the principal cells are small and very numerous, constituting the stratum granulosum. The axons of hippocampal pyramidal cells pass through the stratum oriens and then enter the alveus. The axons of dentate gyrus granule cells pass through the polymorphic layer into the hilus of the gyrus sector CA4 and then into the strata lucidum and pyralidae of sector CA3 of the hippocampus [ 32 ].
A transverse section through the body of the hippocampus and dentate gyrus, lobe temporal fissure, and inferior horn of the lateral ventricle.
Temporal Lobe - The Brain Made Simple
The dentate gyrus and CA sectors of the hippocampus are outlined in red modified from Edinger, [ 33 ]. Amygdala In embryonic development, the origin of lobe temporal amygdaloid body or complex, usually more simply called the amygdala, has been traced to populations of diencephalic and telencephalic cells that form the floor of the lateral ventricle about 3 weeks after conception [ 34 ], long before the first appearance of the developing temporal lobe at about 7 lobe temporal [ 35 ].
The adult amygdala is a group of several nuclei located in the medial part of the temporal pole, anterior to and partly overlapping the hippocampal head. The medial part of the complex, present in the anterior part of the uncus, receives fibres of the olfactory tract.
Two named gyri of the anterior end of the uncus, the ambient and semilunar gyri consist of periamygdaloid cortex that receives fibres from the olfactory tract [ 2832 ]. The larger lateral part of the amygdala, like the hippocampal formation, receives direct and indirect input from most of the cerebral cortex.