Brachiocephalic trunk. Truncus brachio-cephalicus. First branch of arch of aorta. It divides into subclavian and right common carotid arteries. A
(A. thyroidea ima). Inconstant (10%) unpaired artery for thyroid gland arising from the bra-chiocephalic trunk or directly from the aorta. A
COMMON CAROTID ARTERY. A. carotis com-munis. Devoid of branches, it runs on each side of trachea and larynx below the sternoclei-domastoid muscle. A
Carotid body. Glomus caroticum. Chemorecep-tor at the bifurcation of the common carotid artery. It contains capillary tufts, epithelioid cells and abundant nerve endings. It responds predominantly to the oxygen content of the blood, less strongly to carbon dioxide changes. A
Carotid sinus. Sinus caroticus. Slight dilatation at the division of the common carotid artery. It contains baroreceptors. A
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