THORAX ABDOMEN AND PELVIS

MEDICAL

THORACIC WALL

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

The posterior intercostal arteries are present in 11 intercostal spaces. Which of the following arteries give rise to 1st posterior intercostal artery?

A	Superior intercostal artery
B	Costocervical trunk
C	Subclavian artery
D	Thyrocervical trunk

Explanation:

Detailed explanation-1: -There are eleven posterior intercostal arteries on each side. The 1st and 2nd posterior intercostal arteries arise from the supreme intercostal artery, a branch of the costocervical trunk of the subclavian artery.

Detailed explanation-2: -Usually originating from the costocervical trunk, the supreme intercostal artery also may arise from the thyrocervical trunk or its subsequent branches, such as the dorsal scapular artery or inferior thyroid artery.

Detailed explanation-3: -Though the SIA traditionally originates from the costocervical trunk, it may also arise from the thyrocervical trunk or its branches, including the dorsal scapular artery or inferior thyroid artery, among others.

Detailed explanation-4: -There are 12 pairs of posterior intercostal arteries (PIA). The first two pairs originate via the supreme intercostal artery from the costocervical trunk of the subclavian artery and the lower nine (excluding the subcostal artery) are segmental dorsal branches of the descending aorta.

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