Pectoralis Major And Minor Origin And Insertion

Together these muscles are often referred to simply as the pecs. Together with other muscles of the region it produces various movements of the.

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Muscle anatomy of the pectoralis minor.

Pectoralis major and minor origin and insertion. Anterior surfaces of the third to fifth ribs insertion. It consists of a clavicular part and a sternal part both converging to a flat tendon that inserts on the humerus. Pectoralis major is a thick fan shaped muscle contributing to the thoracobrachial motion.

It is also located close in relation to the brachial plexus and both the subclavian artery and vein which all run between the muscle and the rib cage. The medial pectoral nerve pierces the pectoralis minor and the clavipectoral fascia. The pectoralis major from latin pectus meaning breast is a thick fan shaped muscle situated at the chest of the human body it makes up the bulk of the chest muscles and lies under the breast beneath the pectoralis major is the pectoralis minor a thin triangular muscle the pectoralis major s primary functions are flexion adduction and internal rotation of the humerus.

The pectoralis major muscle lies on top of the pectoralis minor muscle which is a smaller muscle of the chest. Anterior surface of the medial half of the clavicle insertion. In attaching to the coracoid process the pectoralis minor forms a bridge structures passing into the upper limb from the thorax will pass directly underneath.

Lateral lip of the bicipital groove of the humerus and anterior lip of the deltoid tuberosity actions. Origin of the pectoralis major. The shortened tight muscle can be easily palpated there.

Muscle anatomy of the pectoralis major. Via a tendon to the medial aspect of the coracoid process of the scapula part or all of the tendon may transverse this process and continue into the coracoacromial ligament. Medial pectoral nerve c8 t1 from medial cord and lateral pectoral nerve c5 c6 c7 from lateral cord.

The pectoralis minor is triangular in shape and is located under the pectoralis major and both form the anterior wall of the axilla. Flexion adduction and internal rotation of the arm at shoulder innervation. Some of the other muscles which may also be involved in the above conditions along with the pectoralis major are the pectoralis minor the scalene the sternalis the subclavicus the deltoids and the rhomboids to name a few.

The pectoralis minor muscle is one of the most superficial muscles on the anterior aspect of the chest or thoracic wall located deep only to the pectoralis major muscle it is one of the anterior axioappendicular thoracoappendicular muscles together with the pectoralis major subclavius and serratus anterior. Origin insertion action. Since the pectoralis minor muscle is smaller and located underneath the pectoralis major this muscle is thought of as the little brother muscle of the chest.

It s innervated by both medial and lateral pectoral nerves. The pectoralis minor muscle is covered anteriorly superficially by the clavipectoral fascia. It forms another point of insertion for the pectoralis major.

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