Ethmoidal Veins

	Ethmoidal Veins The ethmoidal veins are the venae comitantes Vena comitans is Latin for accompanying vein. It refers to a vein that is usually paired, with both veins lying on the sides of an artery. They are found in close proximity to arteries so that the pulsations of the artery aid venous return. B ... of the ethmoidal arteries. Veins of the head and neck {{circulatory-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Superior Ophthalmic Vein The superior ophthalmic vein is a vein of the orbit that drains venous blood from structures of the upper orbit. It is fromed by the union of the angular vein, and supraorbital vein. It passes backwards within the orbit alongside the ophthalmic artery, then exits the orbit through the superior orbital fissure to drain into the cavernous sinus. The superior ophthalmic vein can be a path for the spread of infection from the danger triangle of the face to the cavernous sinus and the pterygoid plexus. It may also be affected by an arteriovenous fistula of the cavernous sinus. Structure The superior ophthalmic vein - together with the inferior ophthalmic vein - represents the principal drainage system of the orbit (with the superior ophthalmic vein being the larger of the two). The superior ophthalmic vein drains venous blood from structures of the upper orbit. The superior ophthalmic vein is the largest and the most consistently present vein of the orbit. It usually measures 2-10 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Anterior Ethmoidal Artery The anterior ethmoidal artery is a branch of the ophthalmic artery in the orbit. It exits the orbit through the anterior ethmoidal foramen. The posterior ethmoidal artery is posterior to it. Structure The anterior ethmoidal artery branches from the ophthalmic artery distal to the posterior ethmoidal artery. It travels with the anterior ethmoidal nerve to exit the medial wall of the orbit at the anterior ethmoidal foramen. It then travels through the anterior ethmoidal canal and gives branches which supply the frontal sinus and anterior and middle ethmoid air cells. Following which, it enters the anterior cranial fossa where it bifurcates into a meningeal branch and nasal branch. The nasal branch travels through cribriform plate to enter the nasal cavity and runs in a groove on the deep surface of the nasal bone. Here it bifurcates into a medial and lateral branch. The lateral branch supplies blood to the lateral wall of the nasal cavity and the medial branch to the nasal septum. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Posterior Ethmoidal Artery The posterior ethmoidal artery is an artery of the head which supplies the nasal septum. It is smaller than the anterior ethmoidal artery. Course Once branching from the ophthalmic artery, it passes between the upper border of the medial rectus muscle and superior oblique muscle to enter the posterior ethmoidal canal. It exits into the nasal cavity to supply posterior ethmoidal cells and nasal septum; here it anastomoses with the sphenopalatine artery. There is often a meningeal branch to the dura mater, while it is still contained within the cranium. Supplies This artery supplies the posterior ethmoidal air sinuses, the dura mater of the anterior cranial fossa, and the upper part of the nasal mucosa of the nasal septum The nasal septum () separates the left and right airways of the Human nose, nasal cavity, dividing the two nostrils. It is Depression (kinesiology), depressed by the depressor septi nasi muscle. Structure The fleshy external end of the nasal .... Refer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Venae Comitantes Vena comitans is Latin for accompanying vein. It refers to a vein that is usually paired, with both veins lying on the sides of an artery. They are found in close proximity to arteries so that the pulsations of the artery aid venous return. Because they are generally found in pairs, they are often referred to by their plural form: venae comitantes. Venae comitantes are usually found with certain smaller arteries, especially those in the extremities. Larger arteries, on the other hand, generally do not have venae comitantes. They usually have a single, similarly sized vein which is not as intimately associated with the artery. Examples of arteries and their venae comitantes: * Radial artery and radial veins * Ulnar artery and ulnar veins * Brachial artery and brachial veins * Anterior tibial artery and anterior tibial veins * Posterior tibial artery and Posterior tibial veins * Fibular artery and Fibular veins Examples of arteries that do not have venae comitantes (i.e. thos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]