Anterior side. Pectoral muscles & deltoids.
The pectoral muscles are flat and cover the chest at the front from the middle of the ribcage ( in the “V” openning) to the 1/2 way the collarbone and it inserts 1/4 down the humerus. This muscle shapes the armpit wall at the front.
The following illustrations show the pectorals placed over the ribcage and attached to the sternum, 2/3 of the clavicle and the ribs at the bottom. It gets inserted under the head of the humerus.
Next to it, at the end of the collarbone, we find the shoulder muscle, the deltoids. It covers all the shoulder from the front, sides and back, giving shape to the arm at the top. It inserts 1/3 down the arm on the side.
Shoulder belt structure.
The structure of the Clavicles and the scapulas is essential to define the top of the chest and shoulders. This is what we call the shoulder belt. It is a bony structure that starts at the front of the chest with the clavicles, folloing its connexion with the shoulder blades through the acromion and continuing with the spine of the scapula in the back. This structure sits on the ribcage.
The scapulas add volume shapping the upper body in the back and sides due to the amount of muscles connected to it.
Trapecious muscle
In a atletic person is clear the division betweeen muscle and ligament, but it is quite rare to see this in an average person. Usually we won’t be able to point the difference, although it is good to know how it works as it will help to understand what we see.
In the following illustrations we marked the muscles of the abdominal walls on a sample of an atletic male, and a female.
Contraction and extension of the obliques depending of the pose.
Arqueo de la espalda.
posicion de los hombros en referencia a la caja tor’acica.
Cinturon escapular.
Movimiento de las escapulas
Ligamento inguinal, forma la base de la barriga
posici’on del hombligo
Como se conectan los oblicuos
Parte posterior:
Breve introduccion de la zona lumbar
trapecio
