Commissure of fornix

Information about Commissure of fornix

Brain:
Latinc. fornicis
subject #189 838
NeuroNameshier-255
Dorlands/Elsevier c_49/12251619
The lateral portions of the body of the fornix are joined by a thin triangular lamina, named the psalterium (lyra). This lamina contains some transverse fibers which connect the two hippocampi across the middle line and constitute the commissure of fornix (hippocampal commissure).

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.



The terminal lamina creates the commisure plate. This structure gives existence to the corpus callosum, the septum pellucidum and the fornix. The latter will split into two columnae fornicis (anterior), and will split into two crus fornicis (posterior). These two crus are joined together through the commissura hippocampalis. The beginning of the splitting is called the psalterium or Lyra Davidis. The latter name is used, because the structure resembles a lyra (or triangular harp): The two crus are the "chassis" of the lyra, and the commisure connections are the fibers.

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Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres)
Primary sulci/fissuresMedial longitudinal, Lateral, Central, Parietoccipital, Calcarine, Cingulate, Callosal Collateral fissure
Frontal lobePrecentral gyrus (Primary motor cortex, 4), Precentral sulcus, Superior frontal gyrus/Frontal eye fields (6, 8, 9), Middle frontal gyrus (46), Inferior frontal gyrus (44-Pars opercularis, 45-Pars triangularis), Orbitofrontal cortex (10, 11, 12, 47)
Parietal lobeSomatosensory cortex (Primary (1, 2, 3, 43), Secondary (5)), Precuneus (7m), Parietal lobules (Superior (7l), Inferior (40)), Angular gyrus (39), Intraparietal sulcus, Marginal sulcus
Occipital lobePrimary visual cortex (17), Cuneus, Lingual gyrus, 18, 19 - Lateral occipital sulcus
Temporal lobePrimary auditory cortex (41, 42), Superior temporal gyrus (38, 22), Middle temporal gyrus (21), Inferior temporal gyrus (20), Fusiform gyrus (37) Medial temporal lobe (Amygdala, Hippocampus, Parahippocampal gyrus (27, 28, 34, 35, 36)
Cingulate cortex/gyrusSubgenual area (25), anterior cingulate (24, 32, 33), Posterior cingulate (23, 31), Retrosplenial cortex (26, 29, 30), Supracallosal gyrus
white matter tractsCorpus callosum (Splenium, Genu, Rostrum, Tapetum), Septum pellucidum, Ependyma, Internal capsule, Corona radiata, External capsule, Olfactory tract, Fornix (Commissure of fornix), Anterior commissure, Posterior commissure Terminal stria
Basal gangliaStriatum (Putamen,Caudate nucleus, Nucleus accumbens), Globus pallidus, Claustrum, Subthalamic nucleus, Substantia nigra
OtherInsular cortex Olfactory bulb, Anterior olfactory nucleus Septal nuclei Basal optic nucleus of Meynert
Some categorizations are approximations, and some Brodmann areas span gyri.
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White matter fibers
Association fibers (Uncinate fasciculus, Cingulum, Superior longitudinal fasciculus/Arcuate fasciculus, Inferior longitudinal fasciculus, Inferior occipitofrontal fasciculus, Fornix) Commissural fibers (Corpus callosum, Anterior commissure, Posterior commissure, Commissure of fornix) Projection fibers
Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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NeuroNames is a system of nomenclature for the human and/or macaque brain.

It is maintained by the University of Washington and is a part of a tool called "BrainInfo". BrainInfo helps one identify structures in the brain.
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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Fornix ("arch") can refer to:
  • Fornix of brain
  • Fornix vaginae

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The hippocampus is a part of the forebrain, located in the medial temporal lobe. It forms a part of the limbic system and plays a part in memory and spatial navigation. Humans and other mammals have two hippocampi, one in each side of the brain.
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A commissure is the place where two things are joined. The term is used especially in the fields of anatomy and biology.

In anatomy, commissure can refer to a number of such bodily junctions.
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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In animals, the brain or encephalon (Greek for "in the skull"), is the control center of the central nervous system, responsible for behavior. The brain is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing,
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The telencephalon (IPA: /tɛlɛnˈsɛfəlɑn/) is the name for the forebrain, a large region within the brain to which many functions are attributed.
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cerebral cortex is a structure within the vertebrate brain with distinct structural and functional properties. In non-living, preserved brains, the outermost layers of the cerebrum has a grey color, hence the name "grey matter".
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cerebral hemisphere (hemispherium cerebrale) is defined as one of the two regions of the brain that are delineated by the body's median plane. The brain can thus be described as being divided into left and right cerebral hemispheres.
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A sulcus (pronounced with a hard c) (pl. sulci) is a depression or fissure in the surface of an organ, especially the brain.

Examples of sulci

In the brain

See Sulcus (neuroanatomy)

Elsewhere

  • sulcus arteriæ vertebralis

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The medial longitudinal fissure (or longitudinal cerebral fissure, or longitudinal fissure, or interhemispheric fissure) is the deep groove which separates the two hemispheres of the vertebrate brain.
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The lateral sulcus (also called Sylvian fissure or lateral fissure) is one of the most prominent structures of the human brain. It divides the frontal lobe and parietal lobe above from the temporal lobe below.
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The central sulcus is a fold in the cerebral cortex of brains in vertebrates. Also called the central fissure, it was originally called the fissure of Rolando or the Rolandic fissure, after Luigi Rolando.
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The calcarine fissure (or calcarine sulcus) is an anatomical landmark located at the very caudal end of the medial surface of the brain. It begins near the occipital pole in two converging rami and runs forward to a point a little below the splenium of the corpus callosum,
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The cingulate sulcus is a sulcus (brain fold) on the medial wall of the cerebral cortex.

See also

  • Cingulate gyrus
  • Cingulate cortex

External links

  • Roche Lexicon - illustrated navigator, at Elsevier 13048.000-3

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The callosal sulcus is a sulcus in the brain between the cingulate gyrus and corpus callosum, below the longitudinal cerebral fissure.


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The collateral fissure (or sulcus) is on the tentorial surface of the hemisphere and extends from near the occipital pole to within a short distance of the temporal pole.
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The frontal lobe is an area in the brain of mammals. Located at the front of each cerebral hemisphere, frontal lobes are positioned in front of (anterior to) the parietal lobes. The temporal lobes are located beneath and behind the frontal lobes.
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The primary motor cortex (or M1) works in association with pre-motor areas to plan and execute movements. M1 contains large neurons known as Betz cells which send long axons down the spinal cord to synapse onto alpha motor neurons which connect to the muscles.
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The primary motor cortex (or M1) works in association with pre-motor areas to plan and execute movements. M1 contains large neurons known as Betz cells which send long axons down the spinal cord to synapse onto alpha motor neurons which connect to the muscles.
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Brodmann area 4 comprises the primary motor cortex of the human brain.

Brodmann area 4 is about the same as the precentral gyrus. The borders of this area are: the precentral sulcus in front (anteriorly), the medial longitudinal fissure at the top (medially), the central
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The precentral sulcus lies parallel to, and in front of, the central sulcus. (A sulcus is one of the prominent grooves on the surface of the human brain.)

The precentral sulcus divides the inferior, middle, and superior frontal gyri from the precentral gyrus.
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The superior frontal gyrus makes up about one-third of the frontal lobe of the human brain. It is bounded laterally by the superior frontal sulcus.

The superior frontal gyrus, like the inferior frontal gyrus and the middle frontal gyrus, is more of a region than a true
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The frontal eye fields (FEF) is a region located in the dorsolateral frontal cortex of the primate brain reported to be activated during the initiation of eye movements, such as voluntary saccades and pursuit eye movements.
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Human

Brodmann area 6, or BA6, is part of the frontal cortex in the human brain. Situated just anterior to the primary motor cortex (BA4), it is composed of the premotor cortex and medially the supplementary motor area, or SMA.
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Brodmann area 8 is one of Brodmann's cytologically defined regions of the brain. It is involved in planning complex movements.

Human

Brodmann area 8, or BA8, is part of the frontal cortex in the human brain.
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Human

Brodmann area 9, or BA9, is part of the frontal cortex in the human brain. It contributes to the dorsolateral prefrontal cortex.

Guenon

The term Brodmann area 9 refers to a cytoarchitecturally defined portion of the frontal lobe of the guenon.
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