pectoralis major muscle

(redirected from Pectoralis muscle)

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 ?
Ultrasound images prior to thelarche show a band of echogenic retroareolar tissue anterior to the pectoralis muscle (Figure 1A).
It is up to the artistic discretion of the surgeon to decide which of these two suggestions or rules will be followed, namely orienting the NAC in a direction parallel to the fibres of the pectoralis muscle or moving the NAC in a lateral and downward position.
Pekin ducklings and broiler chicken pectoralis muscle structure and composition.
3, 6) Mobilization may further be facilitated with a second incision that allows release of the fascia along the medial and inferior margins of the pectoralis muscle belly' allowing an additional 2 cm of tendon advancement.
However, there was near complete absence of pectoralis muscle beneath the breast parenchyma on right side with normally developed left pectoral muscle (Fig.
Electromyographical Activity of the Pectoralis Muscle During Incline and Decline Bench Presses.
Contraction of the pectoralis muscle creates bulging at its origins on the chest.
The upper-arm ergometer helps strengthen the shoulder muscles, including the pectoralis muscle and rotator cuff, which are important for wheeling.
Data regarding use of pedicled pectoralis muscle flaps or free tissue transfer was also collected.
The weakened scar tissue was easily torn, and the strength of the pectoralis muscle pushed the implant deep into her chest," he added.
Intramuscular lipomas arising specifically from the pectoralis muscle are exceedingly rare.