Best writers. Best papers. Let professionals take care of your academic papers

Order a similar paper and get 15% discount on your first order with us
Use the following coupon "FIRST15"
ORDER NOW

Pectoralis Major: Action, Origin & Insertion

/in /by

Do you know about the origin, insertion, and action of the pectoralis major muscle, a muscle that makes up most of the chest muscles? If not, take the time to find out with this lesson.
Pectoralis Major
Have you ever tried to do a push-up? Maybe it was in gym class or doing a boot-camp style workout. If so, then you’ve worked out your pectoralis major muscle.

The pectoralis major is a thick, triangular-shaped muscle located on both sides of the chest. This muscle makes up most of the chest muscles in both males and females, although it’s less visible in females because it’s covered up by breast tissues. The pectoralis major muscle lies on top of the pectoralis minor muscle, which is a smaller muscle of the chest. Together, these muscles are often referred to simply as the ‘pecs’.

The pectoralis major muscle is a large muscle located on each side of the chest. This muscle is much more visible in males than in females.
arnold
Origin
The pectoralis major consists of two heads. One of the heads is called the clavicular head, which originates on the inside part of the clavicle (collarbone). The other head is called the sternal head, and it originates from three different areas, which include:

Outside border of the sternum (breast plate)
Costal cartilages of the top six ribs (cartilage extensions at the front of each rib)
Aponeurosis of the external oblique muscle (fibrous tissue of the external oblique)
The pectoralis major has two different heads, which include the clavicular head and the sternal head.
heads
Insertion
Both the clavicular and sternal heads of the pectoralis major muscle have the same two points of insertion. These two points of insertion are both located on the humerus, which is the long bone of the upper arm. One of these points of insertion is the bicipital groove, which is a groove at the top of the humerus where the biceps brachii tendon is found.

The other point of insertion is the deltoid tuberosity, which is a triangular area located in the middle of the humerus. The deltoid tuberosity is also the point of insertion of the deltoid muscle.

The pectoralis major muscle inserts on the bicipital groove and deltoid tuberosity of the humerus.
humerus
Action
The main action of the pectoralis major muscle is to move the humerus, or upper arm. These movements include:

 
Looking for a Similar Assignment? Order now and Get 10% Discount! Use Coupon Code "Newclient"