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Basal Cisternae
The interpeduncular cistern (or basal cistern) is the subarachnoid cistern situated between the dorsum sellae (anteriorly) and the two cerebral peduncles at the front of the midbrain. Its roof is represented by the floor of the third ventricle (i.e. posterior perforated substance, and the two mammillary bodies). Its floor is formed by the arachnoid membrane extending between the temporal lobes of either side. Anteriorly, it extends to the optic chiasm. The cistern communicates superiorly with the chiasmatic cistern, and inferiorly with the pontine cistern. The chiasmatic cistern, cistern of lamina terminalis, and supracallosal cistern are all extensions of the interpeduncular cistern. Anatomy Contents The cistern contains: * the posterior portion of the circle of Willis: ** basilar artery (including its bifurcation), ** (origins of the) posterior cerebral arteries, ** posterior communicating arteries, * (the origin of the) posterior thalamo-perforating arteries, * (part o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Subarachnoid Cisterns
The subarachnoid cisterns are spaces formed by openings in the subarachnoid space, an anatomic space in the meninges of the brain. The space is situated between the two meninges, the arachnoid mater and the pia mater. These cisterns are filled with cerebrospinal fluid (CSF). Structure Although the pia mater adheres to the surface of the brain, closely following the contours of its gyri and sulci, the arachnoid mater only covers its superficial surface, bridging across the gyri. This leaves wider spaces between the pia and arachnoid and the cavities are known as the subarachnoid cisterns. Although they are often described as distinct compartments, the subarachnoid cisterns are not truly anatomically distinct. Rather, these subarachnoid cisterns are separated from each other by a trabeculated porous wall with various-sized openings. Cisterns There are many cisterns in the brain with several large ones noted with their own name. At the base of the spinal cord is another subarachno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pontine Cistern
The prepontine cistern, or pontine cistern is one of the subarachnoid cisterns situated ventral to the pons. It contains the basilar artery. Each lateral aperture opens into the pontine cistern just posterior to the cranial nerve VIII. Anatomy The pontine cistern is situated ventral to the pons, in the interval between ventral aspect of the pons, and the clivus. Contents The cistern contains the origin of the abducens nerve (CN VI), the basilar artery and the origin of the basilar artery and of its branches, and the anterior inferior cerebellar artery, and superior cerebellar artery. Relations It is continuous inferiorly with the subarachnoid space of the spinal canal, posterolaterally with the cerebellopontine cistern of either side, and rostrally/anteriorly with the interpeduncular cistern The interpeduncular cistern (or basal cistern) is the subarachnoid cistern situated between the dorsum sellae (anteriorly) and the two cerebral peduncles at the front of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Oculomotor Nerve
The oculomotor nerve, also known as the third cranial nerve, cranial nerve III, or simply CN III, is a cranial nerve that enters the orbit through the superior orbital fissure and innervates extraocular muscles that enable most movements of the eye and that raise the eyelid. The nerve also contains fibers that innervate the intrinsic eye muscles that enable pupillary constriction and accommodation (ability to focus on near objects as in reading). The oculomotor nerve is derived from the basal plate of the embryonic midbrain. Cranial nerves IV and VI also participate in control of eye movement. Structure The oculomotor nerve originates from the third nerve nucleus at the level of the superior colliculus in the midbrain. The third nerve nucleus is located ventral to the cerebral aqueduct, on the pre-aqueductal grey matter. The fibers from the two third nerve nuclei located laterally on either side of the cerebral aqueduct then pass through the red nucleus. From the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Basal Vein
The basal vein is a vein in the brain. It is formed at the anterior perforated substance by the union of * (a) a ''small anterior cerebral vein'' which accompanies the anterior cerebral artery and supplies the medial surface of the frontal lobe by the fronto-basal vein. * (b) the ''deep middle cerebral vein'' (''deep Sylvian vein''), which receives tributaries from the insula and neighboring gyri, and runs in the lower part of the lateral cerebral fissure, and * (c) the ''inferior striate veins'', which leave the corpus striatum through the anterior perforated substance. The basal vein passes backward around the cerebral peduncle, and ends in the great cerebral vein; it receives tributaries from the interpeduncular fossa, the inferior horn of the lateral ventricle, the hippocampal gyrus, and the mid-brain The midbrain or mesencephalon is the uppermost portion of the brainstem connecting the diencephalon and cerebrum with the pons. It consists of the cerebral peduncles, tegm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Superior Cerebellar Artery
The superior cerebellar artery (SCA) is an artery of the head. It arises near the end of the basilar artery. It is a branch of the basilar artery. It supplies parts of the cerebellum, the midbrain, and other nearby structures. It is the cause of trigeminal neuralgia in some patients. Structure The superior cerebellar artery arises near the end of the basilar artery. It passes laterally around the brainstem. This is immediately below the oculomotor nerve, which separates it from the posterior cerebral artery. It then winds around the cerebral peduncle, close to the trochlear nerve. It also lies close to the cerebellar tentorium. When it arrives at the upper surface of the cerebellum, it divides into branches which ramify in the pia mater and anastomose with those of the anterior inferior cerebellar artery, anterior inferior cerebellar arteries and the Posterior inferior cerebellar artery, posterior inferior cerebellar arteries. Several branches are given to the pineal body, the a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Posterior Communicating Artery
In human anatomy, the left and right posterior communicating arteries are small arteries at the base of the brain that form part of the circle of Willis. Anteriorly, it unites with the internal carotid artery (ICA) (prior to the terminal bifurcation of the ICA into the anterior cerebral artery and middle cerebral artery); posteriorly, it unites with the posterior cerebral artery. With the anterior communicating artery, the posterior communicating arteries establish a system of collateral circulation in cerebral circulation. Anatomy The arteries contribute to the blood supply of the optic tract. The two posterior communicating arteries often differ in size. Relations Each posterior communicating artery is situated within the interpeduncular cistern, superolateral to the pituitary gland. Each are is situated upon the medial surface of the ipsilateral cerebral peduncle and adjacent to the anterior perforated substance. The ipsilateral oculomotor nerve (CN III) passes inferol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Posterior Cerebral Artery
The posterior cerebral artery (PCA) is one of a pair of cerebral arteries that supply oxygenated blood to the occipital lobe, as well as the medial and inferior aspects of the temporal lobe of the human brain. The two arteries originate from the distal end of the basilar artery, where it bifurcates into the left and right posterior cerebral arteries. These anastomose with the middle cerebral artery, middle cerebral arteries and internal carotid artery, internal carotid arteries via the posterior communicating arteries. Structure The posterior cerebral artery is subdivided into 4 segments: P1: pre-communicating segment * Originated at the termination of the basilar artery * May give rise to the artery of Percheron if present P2: post-communicating segment * From the PCOM around the midbrain * Terminates as it enters the quadrigeminal ganglion * Gives rise to the choroidal branches (medial and lateral posterior choroidal arteries) P3: quadrigeminal segment * Courses poster ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Basilar Artery
The basilar artery (U.K.: ; U.S.: ) is one of the arteries that supplies the brain with oxygen-rich blood. The two vertebral arteries and the basilar artery are known as the vertebral basilar system, which supplies blood to the posterior part of the circle of Willis and joins with blood supplied to the anterior part of the circle of Willis from the internal carotid arteries. Structure The diameter of the basilar artery range from 1.5 to 6.6 mm. Origin The basilar artery arises from the union of the two vertebral arteries at the junction between the medulla oblongata and the pons between the abducens nerves (CN VI). Course It ascends along the basilar sulcus of the ventral pons. It divides at the junction of the midbrain and pons into the posterior cerebral arteries. Branches Its branches from caudal to rostral include: *anterior inferior cerebellar artery *labyrinthine artery (<15% of people, usually branches from the anterior inferior cerebellar artery) * [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Circle Of Willis
The circle of Willis (also called Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures in reptiles, birds and mammals, including humans. It is named after Thomas Willis (1621–1675), an English physician. Structure The circle of Willis is a part of the cerebral circulation and is composed of the following arteries: * Anterior cerebral artery (left and right) at their A1 segments * Anterior communicating artery * Internal carotid artery (left and right) at its distal tip (carotid terminus) * Posterior cerebral artery (left and right) at their P1 segments * Posterior communicating artery (left and right) The middle cerebral arteries, supplying the brain, are also considered part of the Circle of Willis Origin of arteries The left and right internal carotid arteries arise from the left and right common carotid arteries. The posterior communicating artery is given ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Cistern Of Lamina Terminalis
The cistern of lamina terminalis is one of the subarachnoid cisterns. It is situated (depending upon the source) either superior to the lamina terminalis, or rostral/anterior to the lamina terminalis and anterior commissure between the two frontal lobes of the cerebrum. It is situated rostral/anterior to the third ventricle. The cistern is an extension of interpeduncular cistern. The cistern of lamina terminalis interconnects the chiasmatic cistern and pericallosal cistern. The cistern contains the anterior cerebral arteries, the anterior communicating artery, hypothalamic artery, the origin of the fronto-orbital arteries, and Heubner's artery. See also * Terminal cisterna Terminal cisternae (singular: terminal cisterna) are enlarged areas of the sarcoplasmic reticulum surrounding the transverse tubules. Function Terminal cisternae are discrete regions within the muscle cell. They store calcium (increasing t ... References Meninges {{neuroanatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Chiasmatic Cistern
The chiasmatic cistern or suprasellar cistern is a small subarachnoid cistern related to the optic chiasm. Anatomy The cistern is situated superior to the optic chiasm, and inferior to the rostrum of corpus callosum. The cistern is an extension of/communicates inferiorly with the interpeduncular cistern. The cistern of lamina terminalis connects the chiasmatic cistern with the pericallosal cistern. Contents It contains the anterior aspect of the optic chiasm and both optic nerves (CN II), the pituitary stalk, the origin of the anterior cerebral artery, and the anterior communicating artery. References External links NIF Search - Chiasmatic Cisternvia the Neuroscience Information Framework The Neuroscience Information Framework is a repository of global neuroscience web resources, including experimental, clinical, and translational neuroscience databases, knowledge bases, atlases, and genetic/ genomic resources and provides many aut ... Meninges {{neuroana ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Subarachnoid Cistern
The subarachnoid cisterns are spaces formed by openings in the subarachnoid space, an anatomic space in the meninges of the brain. The space is situated between the two meninges, the arachnoid mater and the pia mater. These cisterns are filled with cerebrospinal fluid (CSF). Structure Although the pia mater adheres to the surface of the brain, closely following the contours of its gyri and sulci, the arachnoid mater only covers its superficial surface, bridging across the gyri. This leaves wider spaces between the pia and arachnoid and the cavities are known as the subarachnoid cisterns. Although they are often described as distinct compartments, the subarachnoid cisterns are not truly anatomically distinct. Rather, these subarachnoid cisterns are separated from each other by a trabeculated porous wall with various-sized openings. Cisterns There are many cisterns in the brain with several large ones noted with their own name. At the base of the spinal cord is another subarachno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
