Question

List the muscle that moves a joint it crosses into the anterior plane and its insertion into the posterior plane.

Answer 1

Serratus anterior normally originates by nine or ten slips (muscle branches) from either the first to ninth ribs or the first to eighth ribs. ... The muscle is inserted along the medial border of the scapula between the superior and inferior angles along with being inserted along the thoracic vertebrae.

The muscle is inserted along the medial border of the scapula between the superior and inferior angles along with being inserted along the thoracic vertebrae. The muscle is divided into three named parts depending on their points of insertions:

1. the serratus anterior superior is inserted near the superior angle
2. the serratus anterior intermediate is inserted along the medial border
3. the serratus anterior inferior is inserted near the inferior angle.

Deltoid muscles:

The insertion of the intramuscular tendons of the deltoid muscle formed three discrete sets of muscle fibers, often referred to as "heads":

1. The anterior or clavicular fibers arise from most of the anterior border and upper surface of the lateral third of the clavicle. The anterior origin lies adjacent to the lateral fibers of the pectoralis major muscle as do the end tendons of both muscles. These muscle fibers are closely related and only a small chiasmatic space, through which the cephalic vein passes, prevents the two muscles from forming a continuous muscle mass.
   • The anterior deltoids are commonly called front delts for short.
2. Lateral or acromial fibers arise from the superior surface of the acromion process of the scapula.
   • They are commonly called lateral deltoid. This muscle is also called middle delts,outer delts,or side delts for short.
   • They are also mistakenly called medial deltoid,which is wrong, as their origin is the least medial portion of the deltoid.
3. Posterior or spinal fibers arise from the lower lip of the posterior border of the spine of the scapula.
   • They are commonly called posterior deltoid or rear deltoid(rear delts for short).