shoulder
I believe the answer is head and neck. Hope this helps! :)
aids in flexion of the head and the neck
The short head of the biceps muscle is located on the inner side of the arm, while the long head is on the outer side. The short head is more involved in elbow flexion, while the long head is more involved in shoulder flexion and stability.
Individually rotation of the head to the opposite side. Together , flexion of the neck.
semispinalis capitis splenius capitis longismuss capitis spinalis capitis trapezius
any muscle that assist in shoulder extention posterior fibor of deltoid Triceps long head
sternocleidomstoid
sternocleidomstoid
The prime mover of flexion of the head is the sternocleidomastoid muscle. It acts to tilt and rotate the head to the opposite side when contracted unilaterally and both muscles together flex the neck and bring the head towards the chest.
The Pectoralis major (clavicular head), coracobrachialis, and biceps brachia are the synergists for shoulder flexion. For horizontal flexion, the Anterior deltoid is the synergist muscle.
The muscle that is responsible for the movement of the head from left to right.
Sternocleidomastoid and the Scalenes are Synergists, which mean that they work together to provide the same movements (flexion, rotation and lateral flexion of the head and neck)An Antagonist is a muscle that does the opposite movements. In this case, Antagonists of the Scalenes would be your posterior neck muscles, such as:Upper TrapeziusSplenius CapitusSplenius CervicisSemispinalis Capitis, etc