Arteries

Renal Artery

Renal Artery The structure indicated is the right renal artery. The renal arteries are lateral branches of the abdominal aorta which arise at the level of the intervertebral disc between L1 and L2, just below the origin of the superior mesenteric arteries. There is one renal artery that supplies each kidney. The right renal artery tends to originate slightly lower than the left renal artery, and it passes behind the inferior vena cava to supply the right kidney. The renal arteries then divide into a few anterior and posterior branches at the hilum. The renal arteries can become narrowed, or …

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Right renal artery

Median Sacral Artery

Median Sacral Artery The structure indicated is the median sacral artery. The median sacral artery arises just above the bifurcation of the aorta into the common iliac arteries. The abdominal aorta gives off anterior, posterior and lateral branches. The anterior branches include: Celiac trunk Superior mesenteric artery Gonadal arteries Inferior mesenteric arteries Lateral branches: Middle suprarenal arteries Renal arteries Posterior branches: Inferior phrenic arteries Lumbar arteries Median sacral arteries The median sacral artery supplies the coccyx, the lumbar vertebrae and the sacrum.

medial sacral artery

Vertebral Artery

Vertebral Artery The structure indicated is the vertebral artery. The vertebral arteries arise from the first part of the subclavian artery. Two other arteries are given off from the first part of the subclavian artery – the internal thoracic artery and the thyrocervical trunk. The vertebral and internal carotid arteries provide the arterial supply to the brain, forming the Circle of Willis at the base of the brain. After the vertebral artery is given off from the subclavian artery, it passes through the transverse foramina of cervical vertebrae C1 to C6. It then enters the skull via the foramen magnum. …

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vertebral artery

Splenic Artery

Splenic Artery The structure indicated is the splenic artery. The splenic artery is one of three branches of the celiac trunk, which is the first anterior branch that arises from the abdominal aorta. The abdominal aorta consists of anterior, posterior, and lateral branches. There are three anterior branches which supply the foregut, midgut and hindgut structures these are as follows: Celiac trunk – supplies foregut Superior mesenteric artery – supplies midgut Inferior mesenteric artery – supplies hindgut The celiac trunk arises from the abdominal aorta at the level of the upper part of the first lumbar vertebra. It gives rises …

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splenic artery

Common Hepatic Artery

Common Hepatic Artery The structure indicated is the common hepatic artery. The common hepatic artery is one of three branches of the celiac trunk and is the first anterior branch that arises from the abdominal aorta. The abdominal aorta consists of anterior, posterior, and lateral branches. There are three anterior branches which supply the foregut, midgut and hindgut structures these are as follows: Celiac trunk – supplies foregut Superior mesenteric artery – supplies midgut Inferior mesenteric artery – supplies hindgut The celiac trunk arises from the abdominal aorta at the level of the upper part of the first lumbar vertebra. …

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common hepatic artery

Atrial Arteries

Atrial Arteries The structures indicated are the atrial branches of the right coronary artery. The atrial arteries come off the right coronary artery to supply the right atrium of the heart. The atrial arteries are often describes in terms of three groups: Anterior Lateral Posterior The anterior and lateral branches mainly supply the right atrium, whereas the posterior branch supplies both the right and left atria. Learn more about the blood supply to the heart in this anatomy tutorial.

atrial arteries

Carotid Sinus

Carotid Sinus The structure indicated is the carotid sinus. The carotid sinus is located just above the bifurcation of the common carotid artery at the base of the internal carotid artery. The carotid sinus is an important structure in regulating and maintaining blood pressure. It contains baroreceptors which are sensitive to increases in arterial blood pressure and subsequent increased pressure and stretching of the arterial walls. The carotid sinus receives innervation via cranial nerve IX (glossopharyngeal nerve). This nerve synapses in the nucleus tractus solitarii of the medulla oblongata which then indirectly adjusts the level of autonomic outflow and controls …

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Carotid Sinus

Posterior Interventricular (Descending) Artery

Posterior Interventricular (Descending) Artery The structure indicated is the posterior interventricular artery (posterior descending artery) of the heart. The posterior interventricular artery determines the “dominance” of the coronary blood supply to the heart. For example, if the posterior interventricular artery arises from the right coronary artery, the heart is said to be “right coronary dominant”. In the majority of people, the posterior interventricular artery will usually arise from the right coronary artery. If the posterior interventricular artery arises from the left coronary artery, it will branch from the circumflex coronary artery. Co-dominance occurs when the posterior interventricular artery arises from …

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Posterior Interventricular (Descending) Artery

Anterior Tibial Artery

Anterior Tibial Artery The structure indicated is the anterior tibial artery of the leg. The anterior tibial artery is a branch of the popliteal artery, which supplies the anterior compartment of the leg. The popliteal artery arises from the superficial femoral artery as it passes from the anterior compartment of the thigh to the posterior compartment via the adductor hiatus – an opening in the distal adductor magnus muscle. The popliteal artery gives rise to two branches, the anterior tibial artery and the posterior tibial artery. The anterior tibial artery passes through an opening superiorly in the interosseous membrane between the …

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Anterior Tibial Artery

Left Subclavian Artery

Left Subclavian Artery The structure indicated is the left subclavian artery. The subclavian arteries are located under (“sub”) the clavicle (“clavian”) and receive blood from the aortic arch. The subclavian arteries supply the arms, with some branches that extend to supply the head. The branches of the aortic arch are: Brachiocephalic artery Left common carotid artery Left subclavian artery The left subclavian artery comes directly off the arch of the aorta, whereas on the right side of the body, the brachiocephalic artery splits, giving rise to the right subclavian artery, and the right common carotid artery. The subclavian artery becomes …

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Left Subclavian Artery