Hi, welcome at section five of anatomy basics. In this section we will discuss the muscles of the abdomen, the back and the neck. In previous sections, we added muscles to movements. But in Section five, we will use a different approach. We'll use the locations of the muscles to talk about that. In this first lecture, the abdominal muscles will be explored.

We will work our way through the four abdominals by starting with the most superficial one rectus abdominus. This muscle aka the six pack, or actually eight pack has its origin at the sci fi process and the cartilage surfaces of clusters five, six and seven. It attaches at the cranial ridge of the pubic bone right here. between the left and right part there is a tenderness Line part of the abdominal upon neurosis. This line is called linear Elba or white line. There are also transfers tendinous transitions between the several parts of rector's and that is why you can see the six packs or eight.

The function of rectus abdominus is flexing the spine. one layer deeper, we can find the external obliques. They arise from the outside of clusters five to 12 and inserted linea Alba underneath vectors and the iliac crest right here. Their function is rotating the spine to the opposite side. So the right external oblique rotates the spine to the left. When acting simultaneously, the externals flex the spine.

Another layer deeper we come across the internal obliques these have the origin at the industry. sides of clusters 910 and 11 and the abdominal upon the roses right to linea Alba. The insertion is at the iliac crest and in Guna ligament that you can see here, its function is rotating the spine to the same side, so the left internal oblique turns the spine to the left. When both internals work at the same time they flex the spine. The fourth and deepest abdominal muscle is transverse abdominus. It arises from the lateral part of inguinal ligament, the iliac crest cost us eight to 11 and the dorsal upon a roses or fasciae.

The insertion is also the abdominal upper neurosis to linea Alba. Its activity is compressing and containing the abdominal content. All abdominals contribute in compressing the abdominal content and they support forced exploration like calf And saying rotation of the spine to the right is enabled by cooperation of right internal oblique and left external oblique and vice versa. This is all about the abdominal muscles. And this is the end of lecture one of section five. Thank you for watching this lecture, and I hope to see you again in the next to discuss the muscles of the back