🥇 Anatomía de La AORTA TORÁCICA. (Relaciones, Ramas). Fácil Explicación!

Aorta Torácica: Anatomía y Funciones

Introducción a la Aorta Torácica

• El video presenta una introducción sobre la aorta torácica, destacando su importancia en el sistema circulatorio y mencionando otros videos relacionados sobre la aorta abdominal y la anatomía del corazón.

Estructura de la Aorta Torácica

• La aorta torácica se divide en tres porciones: ascendente, arco y descendente. Se menciona que cada parte tiene ramas específicas que serán discutidas más adelante.

Porción Ascendente de la Aorta

• La porción ascendente es crucial ya que es donde comienza todas las arterias del cuerpo, saliendo directamente del ventrículo izquierdo, lo que implica que recibe mayor presión.

• Esta sección se describe como un embudo llamado vestíbulo aórtico antes de convertirse en la aorta ascendente. Las válvulas separan el ventrículo izquierdo de esta porción.

Localización y Características

• La aorta ascendente se localiza en el mediastino medio, justo donde está el corazón. Tiene un diámetro considerable (hasta 3 cm) y una longitud aproximada de 5 cm.

• Se destaca que la aorta ascendente está envuelta dentro del saco pericárdico, lo cual es importante para entender su relación con otras estructuras vasculares.

Relaciones Anatómicas Importantes

• Al llegar al ángulo de Lewis (unión del esternón), termina prácticamente toda la porción ascendente dentro del saco pericárdico.

• Se discuten las relaciones anatómicas importantes con otras estructuras como el tronco de la arteria pulmonar y las aurículas cardíacas.

Ramas de la Aorta Torácica

Aorta and Its Branches

Overview of the Aorta

• The aorta is discussed in relation to its thoracic section, including the conical shape of the arterial cone and its connection with the pulmonary artery.

• Viewers are encouraged to subscribe for more content related to the aorta and its branches.

Ascending Aorta and Arch

• Introduction to the ascending aorta, leading into discussions about the second portion known as the arch of the aorta or "callado," which means "curved" in Greek.

• The arch is located in the superior mediastinum, posterior to the manubrium sterni, continuing from the ascending aorta.

Pathway of the Aortic Arch

• The pathway of this artery curves backward and leftward rather than moving directly medial to lateral.

• The curvature is better visualized from a lateral perspective; it moves downward after curving back.

Relationships with Surrounding Structures

• The relationships between various structures such as trachea and esophagus are highlighted; initially anterior but later becoming lateral and then posterior relative to these structures.

• Discussion on how nerves like vagus nerve interact with these anatomical features, particularly on their left side.

Branches of the Aortic Arch

• Three main branches arise from this arch:

• Brachiocephalic trunk (first branch), which bifurcates into right common carotid and right subclavian arteries.

• Left common carotid artery (second branch).

• Left subclavian artery (third branch).

Clarification on Terminology

Aorta Anatomy and Function

Overview of the Aorta

• The thoracic aorta is referred to variably in literature, with some authors calling it the descending aorta. This variation depends on the author's preference.

• The descending aorta is considered the final portion of the thoracic aorta, which perforates at level T12 to become the abdominal aorta.

Pressure Receptors in Aortic Portions

• The first two portions of the aorta (the arch and ascending part) contain pressure receptors that help regulate blood pressure through mechanisms involving the vagus nerve.

• These receptors allow the body to monitor arterial pressure and adjust it as necessary, particularly when high pressures are detected.

Anatomical Relationships

• There is a normal narrowing (stenosis) near where the left subclavian artery branches off from the descending aorta; however, this can sometimes lead to pathological conditions like coarctation of the aorta.

• The descending aorta is located in the posterior mediastinum and has specific anatomical relationships with surrounding structures as it descends.

Descending Aorta's Positioning

• Initially lateral to the spine, as it descends, it becomes medial and lies behind the esophagus while being anterior to vertebral bodies.

• Important anterior relations include pulmonary arteries, veins, main bronchus on the left side, and proximity to pericardium surrounding the heart.

Branches of Thoracic Aorta

• The thoracic aorta divides into parietal branches (which supply walls of thorax like posterior intercostal arteries from 3rd to 11th spaces) and visceral branches (which supply organs).

• Posterior intercostal arteries originate from T3-T11; T1-T2 are supplied by superior intercostal artery from subclavian artery.

Visceral Branches

• Below T11, an additional branch called subcostal artery arises beneath rib 12; this supplies areas below that rib.

• Visceral branches include bronchial arteries (three total: two left-side direct from aorta and one right-side originating from common trunk with third posterior intercostal).

Additional Branches

• Esophageal arteries typically consist of two parts: superior and inferior esophageal arteries supplying respective regions as they descend alongside other structures.

• Other branches include pericardial branches for heart coverage and numerous mediastinal branches serving various mediastinal structures.

Conclusion