Using the letters from column B, match the artery descriptions in column A. (Note that some require more than a single choice.) Column A ____ (1) unpaired branch of abdominal aorta ____ (2) second branch of aortic arch ____ 3) branch of internal carotid ____ (4) branch of external carotid ____ (5) origin of femoral arteries Column B a. right common carotid b. superior mesenteric c. left common carotid d. external iliac e. inferior mesenteric f. superficial temporal g. celiac trunk h. facial i. ophthalmic j. internal iliac
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Step 1: Identify the unpaired branches of the abdominal aorta. Recall that the abdominal aorta gives off three major unpaired branches: the celiac trunk, the superior mesenteric artery, and the inferior mesenteric artery. From the options, these correspond to letters g (celiac trunk), b (superior mesenteric), and e (inferior mesenteric).
Step 2: Determine the second branch of the aortic arch. The aortic arch typically gives off three branches in order: the brachiocephalic trunk (which divides into the right common carotid and right subclavian), the left common carotid artery, and the left subclavian artery. Therefore, the second branch is the left common carotid artery, which corresponds to letter c.
Step 3: Identify a branch of the internal carotid artery. The internal carotid artery gives off several branches, one of which is the ophthalmic artery. From the list, the ophthalmic artery corresponds to letter i.
Step 4: Identify a branch of the external carotid artery. The external carotid artery has several branches including the facial artery (h) and the superficial temporal artery (f). Both are branches of the external carotid, so both letters h and f apply here.
Step 5: Determine the origin of the femoral arteries. The femoral arteries are continuations of the external iliac arteries after they pass under the inguinal ligament. Therefore, the origin corresponds to the external iliac artery, letter d.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Anatomy of the Aortic Arch and Its Branches
The aortic arch gives rise to major arteries supplying the head and upper limbs. Typically, the first branch is the brachiocephalic trunk, the second is the left common carotid artery, and the third is the left subclavian artery. Understanding this order helps identify arteries originating from the aortic arch.
The abdominal aorta gives off several unpaired branches that supply the digestive organs, including the celiac trunk, superior mesenteric artery, and inferior mesenteric artery. Recognizing these arteries is essential for matching descriptions of unpaired branches.
The common carotid artery bifurcates into internal and external carotid arteries. The internal carotid artery supplies the brain and gives off branches like the ophthalmic artery, while the external carotid artery supplies the face and scalp with branches such as the facial and superficial temporal arteries.