pectoralis major muscle


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Related to pectoralis major muscle: pectoralis minor

pec·to·ra·lis ma·jor mus·cle

(pek'tōr-āl'is mā'jŏr mŭs'ĕl)
Superficial thoracoappendicular muscle of chest; origin, clavicular part (pars clavicularis), medial half of clavicle; sternocostal part [TA] (pars sternocostalis), anterior surface of manubrium and body of sternum and cartilages of first to sixth ribs; abdominal part [TA] (pars abdominalis [TA]), aponeurosis of external oblique; insertion, crest of greater tubercle of humerus; action, adducts and medially rotates arm; nerve supply, anterior thoracic.
Synonym(s): greater pectoral muscle, musculus pectoralis major.

pectoralis major muscle

Chest wall muscle. Origin: medial half of clavicle, sternum, costal cartilages 4-6. Insertion: lateral edge of bicipital groove of humerus. Nerve: lateral and medial pectoral (C5-T1). Action: adducts and medially rotates arm.
See also: muscle
References in periodicals archive ?
Tears are most commonly a result of an indirect mechanism by which the pectoralis major muscle fibers are stretched to a point of mechanical disadvantage and fail under a given load.
The PS case presented here is one of the few cases described from Bangladesh and had peculiar presentation as it involved only the unilateral aplasia of the pectoralis major muscle without any other associated defects.
Different surgical techniques have been used for repair of a ruptured pectoralis major muscle including: end to end repair along with reinforcing by anchor sutures when a segment of tendon remains attached to the humerus [8], suturing tendon by non-absorbable sutures directly to drilled holes in insertion site [6], to two rows of drill holes [9], or to trough and related holes made near it [10, 11], and using cancellous screw and washers [2] or staples [12].
An unusual case of an intramuscular lipoma of the pectoralis major muscle simulating a malignant breast mass.
Aspirate with a large needle and, if positive, insert chest tube at the lateral border of the pectoralis major muscle and angle toward the clavicle.
Subglandular implant placement, also called prepectoral, is between glandular tissues and the pectoralis major muscle.
Patient and control pectoralis major muscle and cardiac muscle (10 g each) were fixed in 200 mL/L formalin for 15 h at room temperature.
Although the abdominal muscles are flaccid in quadriplegics, expiration is aided by the contraction of the clavicular portion of the pectoralis major muscle and the cranial portion of the serratus anterior muscle.
In chicken, the fast growing line that has a greater muscle mass tended to exhibit a greater number (20%) and size (90%) of muscle fibers in the pectoralis major muscle compared to the slow growing line (Remignon et al.
Pectoralis major muscle activity in the last repetition was significantly greater than the first repetition (pre-test: p = 0.
1) The main component of this anomaly is absence of the pectoralis major muscle.
Meat quality data from the sib test flock were all measured in the Pectoralis major muscle and collected as follows: