<transcript><audio_30> detrás del borde posterior, ya empieza el nivel 2B, y acá tenemos el músculo externo que lo hemos estudiado y que lo vamos a estar viendo acá. ¿Sí? Acá les muestro un ejemplo de los ganglios retrofaringeos que les decía. Fíjense que el ganglio está medial</transcript><transcript><audio_31> leche azul nos muestra la carótida y este ganglio, fíjense, ya lo vamos a ir viendo, es un ganglio que está necrosado, se ve hipodenso con cierto realce periférico. Este es un ganglio retrofaringeoláctico,</transcript><caption><image_32>The image is a black and white MRI scan of a human skull. The skull appears to be in the center of the image, with the top half of the skull facing towards the left side of the frame. The top half is black, while the bottom half is white.

The skull has a large, circular opening in the middle, which is likely the jawbone. The jawbone is surrounded by a series of small, circular structures, which are likely the bones that make up the skull's structure. The structures are arranged in a symmetrical pattern, with some areas appearing larger and more prominent than others. There are also several smaller structures scattered throughout the image. The image is labeled with the words "Retrofaringes" in yellow text at the top.</caption><transcript><audio_33> Bien, el nivel 3. En el nivel 3 ya estamos en un nivel infraclavicular, infravideo, perdón. Se va a encontrar por dentro del borde medial de la clavícula.</transcript><transcript><audio_34> por detrás el borde posterior del músculo externo cleido mastoideo ¿sí? lo tenemos acá y lo tenemos acá ¿sí? este es un corta excel de tomografía y lo vemos así ¿sí? por el borde esta es la carotia esta es la jugular esto que se queda que se ve acá</transcript><transcript><audio_35> Entonces acá dijimos por el borde medial de la carótida y por el borde posterior del músculo externo que le he dado más cuidado. Esta es la zona del nivel 3. ¿Cómo lo vemos por ecografía? Al paciente lo vamos a posicionar de esta manera y</transcript><caption><image_36>The image is a collage of three different images. On the left side, there is a close-up of a person's neck with their hand resting on their neck. The image is labeled "Nivel III YUGULARES MEDIOS" which translates to "YUGULARES MEDIOOS" in English. 

On the right side of the image, there are three images. The first image on the top right shows a 3D model of a skull with a red dot in the center. The skull appears to be in the process of being scanned, as indicated by the red dot. The second image in the bottom left shows the same skull, but with different colors and shapes. The third image shows the skull in the top center, with a green and purple color scheme.

The image appears to have been taken in a medical facility, as there are medical equipment visible in the background.</caption><transcript><audio_37> el lado opuesto y nos vamos a encontrar con esta imagen. El transductor lo vamos a poner acá arriba y nos vamos a encontrar con esta imagen. Vamos a encontrar el músculo externo clídeo mastideo, por debajo del externo clídeo vamos a encontrar la yugular interna y vamos a encontrar la carotida interna. Lo que vemos acá</transcript> level 2 a behind the posterior edge if level 2b begins and  Here to which I show you an example of the retropharyngeal rings that I told you, notice that the lymph node is halfway to the carotid, the blue arrow shows us the carotid and this lymph node, look, we are going to see it.  a ganglion that is crossed and the dense hiccups can be seen with some peripheral enhancement. This is a lateral retro-Phoenician ganglion or government ganglion. They call it level 3, level 3, we are at an infraclavicular level. intra video, sorry, it will be found on the edge. inside the edge through that of the common carotid yes and behind the posterior edge of the sternocleidomastoid muscle if we have it here and we have it here if this is an axial section of tomography and we are going to follow it along the edge this is the carotid this is The jugular that remains that is seen here is the hyoid bone and then here we direct the medial edge and the carotid and with the posterior edge of the sternocleidomastoid muscle it is in the area of ​​level 3 as later by ultrasound of the patient we are going to position it  this way and pre extended looking with the opposite side and we are going to find with this image the product we are going to put it up here and the other with this image you will notice the sternocleidomastoid muscle if below the sternum fallen when after the internal jugular and let's  to find the internal carotid, what we see back here
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