Anatomy 1 The carotids, common, ext and int LU 6

Where does the right common carotid artery branch from?

• innominnate artery

• aortic arch

• ascending aorta

• right subclavian artery

Answer explanation

The right common carotid artery branches from the innominate artery (also known as the brachiocephalic trunk), which is the correct choice. It does not branch from the aortic arch, ascending aorta, or right subclavian artery.

What vein does the posterior auricular vein and posterior facial vein form?

• SVC

• external jugular vein

• internal jugular vein

• basilar vein

Answer explanation

The posterior auricular vein and posterior facial vein drain into the external jugular vein, which collects blood from the head and neck regions. Therefore, the correct answer is the external jugular vein.

Where does the left common carotid artery branch from?

• innominnate artery

• aortic arch

• ascending aorta

• left subclavian artery

Answer explanation

The left common carotid artery branches directly from the aortic arch, making it the correct choice. The innominate artery and left subclavian artery are not the sources for this artery.

Which arteries supply the main blood supply to the brain?

• vertebral arteries

• internal carotid arteries

• external carotid arteries

• basilar arteries

Answer explanation

The internal carotid arteries are the primary vessels supplying blood to the brain, branching into the anterior and middle cerebral arteries. The vertebral and basilar arteries also contribute, but the internal carotids are the main supply.

Veins that return blood from the brain are called dural sinuses

• true

• false

Answer explanation

True. Dural sinuses are specialized veins that collect and return deoxygenated blood from the brain to the internal jugular veins, playing a crucial role in cerebral circulation.

Which of the following is the second branch of the aortic arch.

• Common hepatic artery

• Left subclavian artery

• Left common carotid artery

• brachiocephalic

Answer explanation

The aortic arch has three main branches. The first is the brachiocephalic artery, the second is the left common carotid artery, and the third is the left subclavian artery. Thus, the correct answer is the left common carotid artery.

Which of the following drains blood from the deeper aspects of the brain?

• superior sagittal sinus

• inferior sagittal sinus

• straight sinus

• dural sinus

Answer explanation

The inferior sagittal sinus drains blood from the deeper aspects of the brain, particularly from the medial parts of the cerebral hemispheres. It is crucial for venous drainage, unlike the other options listed.

Which two veins form the innominate vein?

• superior sagittal sinus and the straight sinus

• posterior auricle vein and the posterior facial vein

• internal jugular vein and the subclavian vein

• right brachiocephalic vein and the left brachiocephalic vein

Answer explanation

The innominate vein, also known as the brachiocephalic vein, is formed by the union of the internal jugular vein and the subclavian vein on each side of the body.

Blood from the inferior sagittal sinus will flow into the superior sagittal sinus.

• true

• false

Answer explanation

Blood from the inferior sagittal sinus drains into the straight sinus, not directly into the superior sagittal sinus. Therefore, the statement is false.

Which of the following arteries are the terminal branches of hte internal carotid artery?

• anterior cerbral and middle cerebral

• anterior communicating and posterior communicating

• basilar and anterior communicating

• anterior cerebral and posterior communicating

Answer explanation

The internal carotid artery terminates by branching into the anterior cerebral artery and the middle cerebral artery, which supply blood to the brain. The other options include arteries that are not terminal branches.