Relations of the Initial Segment of the Oculomotor Nerve and Adjacent Arteries in Fetal and Adult Period (original) (raw)
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Anatomy of the extraneural blood supply to the intracranial oculomotor nerve
British Journal of Ophthalmology, 1996
Aims-An anatomical study was undertaken to determine the extraneural blood supply to the intracranial oculomotor nerve. Methods-Human tissue blocks containing brainstem, cranial nerves II-VI, body of sphenoid, and associated cavernous sinuses were obtained, injected with contrast material, and dissected using a stereoscopic microscope. Results-Eleven oculomotor nerves were dissected, the intracranial part being divided into proximal, middle, and distal (intracavernous) parts. The proximal part of the intracranial oculomotor nerve received extraneural nutrient arterioles from thalamoperforating arteries in all specimens and in six nerves this blood supply was supplemented by branches from other brainstem vessels. Four nerves were seen to be penetrated by branches of brainstem vessels and these penetrating arteries also supplied nutrient arterioles.
Angiosome territories of intracranial course of oculomotor nerve (III
Medica innovatica, 2024
Introduction: Angiosome is depicted as a region of a nerve supplied by an artery. The concept of the angiosome was originated from the Plastic and Reconstructive surgical fields to enhance the knowledge regarding the vascular anatomy of human body. Aim & objectives: To demonstrate Neurovascular supply of oculomotor nerve from brain stem till superior orbital fissure. Material & methods: The study procured forty-five adult human brains and their base of the heads from the Department of anatomy, Mamata medical college, Khammam. Results: The proximal part of the oculomotor nerve was supplied by the central branches of the Posterior Cerebral Artery, whereas the distal part was supplied by the cavernous part of the internal carotid artery. Conclusion: Although functioning of peripheral nerves is influenced by their vascular supply, cessation of the arterial supply to any part of a nerve affects the passage of nerve impulses and will ultimately induce a complete nerve block. This anatomical study may help in reducing the post surgical morbidity rates after surgery.
Cureus, 2018
The posterior cerebral artery (PCA) is a branch of the terminal part of the basilar artery and perfuses the temporal lobes, midbrain, thalamus, and the posterior inferior portion of the parietal lobes. It is divided into P1-P4 segments. Variations in the P1 segment of the PCA are important to neurosurgeons when performing surgery, for example, on basilar tip aneurysms. We report bilateral superior cerebellar artery (SCA) arising from the P1 segment of the PCA. Such a configuration appears to be uncommon but should be kept in mind by neurosurgeons, neurointerventionalists, and neuroradiologists.
Oculomotor nerve palsy due to compression by posterior cerebral artery: case report
Erciyes Medical Journal, 2007
Isolated oculomotor palsy due to vascular compression at the root exit zone is an extremely rare entity. A 59-year-old male patient was presented with complaints of diplopia and mild ptosis. A thin-sliced MRI demonstrated that, the right posterior cerebral artery was impinging on the right oculomotor nerve at the root exit zone. Carbamazepine therapy was initiated, and after a month of medication, both diplopia and ptosis had completely resolved. Although it is extremely rare, vascular compression of the oculomotor nerve at the root exit zone should also be considered in the differential diagnosis of isolated oculomotor palsy.
The Relationships Between The Superior Cerebellar Artery and Trochlear Nerve
Ankara Üniversitesi Tıp Fakültesi Mecmuası, 2009
Trochlear nerve palsy has been based on head trauma, various inflammatory and infectious disorders, vascular diseases and neoplasms. In many cases cause of the nerve palsy unclear. We examined in relationship of the superior cerebellar artery (SCA) with the trochlear nerve in 35 cadaveric brains. The trochlear nerves were in contact with main trunk of the SCAs or its branches in all hemispheres. The anatomic relationships between the SCA and the trochlear nerve were observed in this study.
Human Basilar Artery Abnormalities in the Prenatal and Postnatal Period
World Neurosurgery, 2013
Although complex and varied, adult cerebral angioarchitecture has its origins in embryologic development, where normal components, variations, and abnormalities evolve from modifications of primitive vessels. Therefore, the aim of this report was the study of the morphologic features of the basilar fenestrations in prenatal and postnatal period and associated variants and/or pathologies. We studied the brain vessels of 120 fetuses microscopically (i.e., with an operative microscope) and 112 adult cadavers macroscopically. We described 10 cases of basilar abnormalities, five fetal and four adult fenestrations, as well as one adult case with a basilar aneurysm. The location of the vertebrobasilar junction on a caudal myelencephalon and a prolongation of the basilar trunk followed both fetal and adult forms of fenestrations. The same caliber values of the basilar and internal carotid arteries, a variation in the number and origin of some of the basilar side branches, and a tendency of fenestrations to be multiple in number, as particular fetal features, were mostly present in adults. The fact that basilar fenestrations in adult specimens shared similar features with fetal ones and without aneurysms, as well as the fact that a basilar aneurysm was without fenestration in its base, lead us to hypothesis that the basilar fenestration is a vascular developmental variant related to the maintenance of vascular symmetry in the midline of the human brain base.
Annals of Indian Academy of Neurology, 2010
www.annalsofi an.org dislodged into the PCA via the larger diameter of PcomA. A severe carotid stenosis could be responsible for occipital lobe infarction in patients having a FC or a patent PCcomA with anteroposterior fl ow. FC, where PCA arose predominantly from the ICA, has been reported in adults at 4% to 46% on the basis of anatomical [1-8] and angiographic studies, [15] and a higher percentage of on the basis of anatomical studies has been reported in older fetuses and newborns: 35% [12] and 56%. [13] Krishnamurthy et al. [16] investigated the variations in the CW in 24 adults and 21 fetal brains of South Indian origin and concluded that the CW is highly variable and justifi es further studies on diff erent racial and geographic regions which may give a clearer picture about the formation of CW. The purpose of this study was to examine the degree of contribution from the vertebrobasilar and carotid systems to the origin of the PCA in fetal autopsy brains of last trimester of pregnancy and to compare with published data on the confi guration of adult brains in a population of Sri Lankan origin, [2] and to discuss with similar studies published in other ethnic or racial populations: Caucasian dominant studies [12,13] and in Asian studies (Iran) [9] and to compare with published
Remnants of embryonic arteries on the brain base: A case report
World Journal of Neuroscience, 2012
The posterior communicating artery (PCoA) arises from the cerebral part of the internal carotid artery and reaching the interpeduncular cistern unites with the posterior cerebral artery, marking the beginning of its post-communicating part. We accidentally found a case of an unusual origin and termination of the right PCoA associated with a presence of the right olfactory artery remnant in a 35-year-old male cadaver routinely dissected at Institute of Forensic Medicine. Presented vascular variations have not been reported previously in the literature. In the event of PCoA origin from the right middle cerebral artery normally developed from the cranial end of primitive internal carotid artery, as well as the PCoA junction with basilar tip, this PCoA could be the most cranial carotidbasilar anastomosis. Simultaneously, here presented right olfactory artery remnant could be the third variant of this persistent embryonic artery.
The course of the posterior inferior cerebellar artery may be related to its level of origin
Surgical and Radiologic Anatomy, 2004
The course of the posterior inferior cerebellar artery (PICA) was analyzed with reference to its origin and relationships with the medullary and cerebellar surfaces and the adjacent cranial nerves in 40 brains after the injection with acrylic resins of the vertebrobasilar system. In 42.5% of instances, the PICA originated from the lateral medullary segment of the vertebral artery (VA), in