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Anatomical Studiesof the Collateral Blood Supply to the Brain and The J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.26.5.414 on 1 October 1963. Downloaded from J. Neurol. Neurosurg. Psychiat., 1963, 26, 414 Anatomical studies of the collateral blood supply to the brain and the retina J. SZAPIRO AND H. PAKULA From the Neurosurgical Clinic and the Department of Anatomy, Medical Academy, L6dz, Poland A turning point in the attitude to cerebrovascular carotid arteries, that is, through the anterior part of disorders has become apparent in the last decade and the circle of Willis. is related in some degree to the growing interest in Anatomical post-mortem studies are convenient the arterial territory situated between the aortic for investigating the anastomoses between internal arch and the circle of Willis. This report deals with and external carotid systems with special reference anatomical studies concerning one of its main to the ophthalmic artery. Direct blood supply to the fragments which has been called by one of the present brain from the external carotid system by the ophthal- authors (Szapiro, 1960) the anterior aorto-cerebral mic arteries is fully active in phylogenesis and onto- circle or the carotid circle (Fig. la, left upper genesis. It loses its significance during extrauterineguest. Protected by copyright. quadrant). This area is a common site for various human life and regains it only in certain cases of pathological processes such as thromboses, arterio- ipsilateral internal carotid artery thrombosis, prob- sclerotic lesions narrowing the lumen of the arteries, ably where the more natural channels of collateral aneurysms, developmental anomalies, and carotid circulation are ineffective. sinus hypersensitivity. Also, in this region many pro- Anatomical studies related to the problem of the cedures are performed, such as angiography, carotid carotid circle were initiated by Elschnig (1893). ligation, thrombembolectomy, bypass graft, and de- Many years later they were renewed by Walsh and nervation of the carotid sinus. Some of these patho- King (1942) and also by Shea (1956), who even logical processes and procedures may contribute to attempted to analyse this problem statistically. In cerebrovascular insufficiency and certain operations these experiments the role of the external carotid tend to relieve these disorders. Its usefulness is also artery as a potential source of the blood supply was due to the fact that the carotid circle is formed for elucidated and can often be confirmed by angio- the most part by vessels which are nearly symmetrical graphy. and have one 'dead point' situated in physiological Further studies of certain details concerning this conditions in the anterior communicating artery. subject seemed to be justified, and in our anatomical The accessibility of the carotid arteries in the neck to investigations, referred to in detail in a separate palpation and compression makes it possible to study report (Szapiro, Goetzen, gwietliczko, Pakula, and the behaviour of the collateral circulation by causing Gluszcz, 1962) we have used, while injecting the its temporary breakdown or mobilization by means arteries, a method of eliminating the possible http://jnnp.bmj.com/ of the carotid compression test. This control may be channels of the collateral circulation. Usually the studied not only through observation of the patient's internal carotid artery was excluded, and a latex behaviour but also by such ancillary methods as medium prepared according to Goetzen's method angiography, electroencephalography, and ophthal- (1957) or, alternatively preserved blood was injected modynamometry. into the ipsilateral external carotid artery or into its The external carotid arteries with their branches branches. Each experiment was performed in at and their anastomoses must be studied together with least two variants. In the first the connexion between the internal carotid system in considering the carotid the internal carotid arteries was patent and in the on September 26, 2021 by circle, and the strategic position of the ophthalmic second it was blocked by a clip. The main purpose arteries is obvious (Fig. la). Clinical examination of of these experiments was to fill both ophthalmic the terminal branches of the ophthalmic arteries by arteries with the injected substance through various means of ophthalmodynamometry is known to be extracranial routes and to determine the difference useful in the diagnosis of carotid occlusion and may in time between the filling of each. To complete the also provide information on collateral blood flow study several experiments were carried out in order passing through the connexions between the internal to investigate the possibility of filling the internal 414 J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.26.5.414 on 1 October 1963. Downloaded from Anatomical studies of the collateral blood supply to the brain and the retina 415 FIG. Ia. The anterior ...... AI f 6 Aaorto-cerebral circle to show the anastomoses between both external carotid arteries and between each external carotid artery and the homolateral ophthalmic artery. FIG. I b. The latex --------------._...medium was injected into the right external carotid artery. The right internal guest. Protected by copyright. / ~~~~~carotid artery was previously ligated in the neck. Furthermore a clip bwas set on the left internal carotid artery intra- cranially between the ophthalmic artery and the Posterior communicating N artery. The miedium 7 N reached both ~~~~~~~~~~~~~~~~~~~~obviouslyophthalmic arteries by an extracranial route. ;;4z'g,{'1. .^} ^SX | < tt <1- 4-i! 1ll) FIG. Ic. The latex ~~~~*~~~ medium was injected into the external carotid artery. *1 ~ ;9i,--S-+. tSome^ wSof7its branches, and http://jnnp.bmj.com/ among them the superficial /-~~~-- ~~ 't-~~~k~~' temporal artery and the jj4+' s tI ^ :: r $.<@ / t facial artery, were previously clipped at their beginning, allowing most of the medium to flow into the maxillary artery. / / The medium reached r'IJf> both ophthalmic arteries. on September 26, 2021 by FIG. Id. The same as in Fig. Ic. An accessory clip was set on the anterior communicating artery to exclude the possi- bility ofthe opposite ophthalmic artery beingfilled by way ofthe anterior part ofthe circle of Willis. The medium reached both ophthalmic arteries. J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.26.5.414 on 1 October 1963. Downloaded from 416 J. Szapiro and H. Pakula carotid artery from the ipsilateral external carotid TABLE I artery by channels other than the ophthalmic artery. Injected Artery Filling ofOphthalmic Arteries (sec.) A few corrosive experiments were added. Radio- graphic verification was only performed occasion- Ipsilateral Heterolateral ally. Unfortunately, a mechanical injector was not Intracranial route available. The number of experiments, including Internal carotid 2 6 also the studies of the posterior aorto-cerebral circle, Extracranial route did not exceed 50, so no statistical conclusions could External carotid (superior thyroid excluded) +48 + 78 be drawn: in each particular group one to four Maxillary + 7 + 30 experiments were performed. Facial +12 +100 Superficial temporal +14 + The first group of experiments was, in fact, a Occipital +15 repetition of studies reported by former authors, and Posterior auricular was that Lingual +90 + 56 it confirmed the medium injected into one Ascending pharyngeal +95 + 75 external carotid artery may reach the cerebral Superior thyroid + 72 + 60 arteries of both cerebral hemispheres and fill both ophthalmic arteries as well. We could not fully estimated. Of the heterolateral anastomoses, atten- confirm this last detail, so in the next experiment tion should be paid to the maxillary arteries (Figs. 2b (Fig. lb), before the medium was injected into the and 2c). Table I sets out results of experiments which right external carotid artery, a clip was placed on show both the possibilities of filling of the ipsilateral the left internal carotid artery intracranially between and opposite ophthalmic artery by the medium the ophthalmic artery and the posterior communicat- injected into various branches of the external carotid ing artery. In this way any possible filling of the left artery and the respective time differences. guest. Protected by copyright. ophthalmic artery through the arteries of the circle All our findings should be confirmed in a larger of Willis was excluded. It was found that the medium series but even so they can serve as a general guide. still reached both ophthalmic arteries obviously The same applies to the recently suggested possibility through the branches of the external carotid arteries. of filling of the internal carotid artery from the In the next group ofexperiments the latex medium external carotid artery by routes other than the was injected into one of the branches of the external ophthalmic, which finding was indeed observed in carotid artery, namely, into the superficial temporal, one of our experiments. then to the maxillary and to the facial arteries. The medium reached both ophthalmic arteries in all these CONCLUSIONS experiments. Figure Ic represents this fact schem- atically. This result was not prevented by placing a Our studies have shown that there are numerous clip on the anterior communicating artery and the possible channels of collateral circulation from the medium reached the cerebral vessels of both hemi- external carotid artery to the brain and retina. spheres apparently through anastomoses of both They reflect not
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