Pecs Flashcards
Where does the Pec muscle tuck into
The pecs tuck into the the clavicle and sternum
What is the shape of the muscles in the pecs
The pec muscle fibers overlap in a folding fan pattern
Where does the pec originate?
The pec originates at the center most half of the clavicles front plane, the entire length of the sternum, and the top of the external obliques aponeurosis
Where does the pec attach to the humorous?
The pec attaches at the bicipital groove with a tendon that’s as long as your wrist. the deltoid cover this tendon
What is the bicipital groove?
a deep, oblique groove across the upper third of the humorous. This is where the oblique attaches to the humorous
What are the functions of the pectoralis?
- Pulls the arm forward
- Lower the arm
- Adduct the arm side ways( across the body)
- Rotate the arm medially (like for arm wrestling)
What are the three portions of the pec that overlap?
- The clavicular portion
- The sternal portion
- The abdominal portion
Describe the clavicular portion of the pec muscle
The clavicular portion is the thickest of the 3 portions and appears as longer than the other 2. It can obscure the front plane of the clavicle,
What is the infraclavicular fossa?
The little triangular groove that separates the deltoid from the clavicular portion of the pectoral major
Describe the sternal portion of the pectoral major
The sternal portion of the pec is the largest of the 3, and is so thin you can sometimes see the ribs through it
If you see a pattern near the sternum that look like it may be the ribs poking through, how can you tell the difference between the ribs and the pecs
The ribs have a consistent horizontal angle, but the pecs radiate outward
describe the abdominal portion of the pecs
The abdominal portion is the deepest and smallest layer of the pecs. points up to the insertion.it originates at the aponeurosis of the external oblique at the 5th rib
