pectoralis minor


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

pectoralis minor

a thin triangular muscle of the upper chest wall beneath the pectoralis major. The base arises from the third, fourth, and fifth ribs on their upper outer surfaces. It inserts as a flat tendon into the coracoid process of the scapula. It functions to rotate the scapula, to draw it down and forward, and to raise the third, the fourth, and fifth ribs in forced inspiration. Compare pectoralis major, subclavius.
enlarge picture
Pectoralis minor

pectoralis minor

A muscle beneath the pectoralis major, attached to the coracoid process of the scapula that depresses as well as causes anterior tipping of the scapula.
See also: pectoralis
References in periodicals archive ?
The common subscapular trunk descends medial to the axillary vein and medial root of the median nerve, resting on ventral surface of subscapular muscle under cover of pectoralis minor muscle.
The pectoralis major appears thick, and overlies pectoralis minor, with a strongly reflective hyperechogenic perimysium often separating the two muscles.
Muscle flexibility of the pectoralis minor was tested by having the subject lie supine on a firm table with knees bent and the lumbar spine flat on the table.
Because the staging of lymph node involvement is such an important aspect of breast cancer staging, it has been divided into three distinct levels: Level I lymph nodes are lateral to the lateral margin of the pectoralis major muscle and extend down into the tail of the breast; Level II lymph nodes are beneath the pectoralis minor muscle; and Level III lymph nodes are medial and superior to the pectoralis minor muscle.
In his original description titled "Deficiency of the pectoral muscles," he specifically noted absence of the stern costal portion of the pectoralis major muscle with an intact clavicular origin, absence of the pectoralis minor muscle, and hypoplastic serratus and external oblique muscles.
Palpation revealed tenderness and hypertonicity of the right anterior scalene, upper trapezius, levator scapulae, rhomboids, infraspinatus, subscapularis, pectoralis minor, corocobrachialis, pronator teres and flexor carpi ulnaris muscles.
The weight of pectoralis major and pectoralis minor muscles, which were dissected for sensory analysis, was also recorded and included as lean in carcass composition.
He was treated with physical therapy for a torn pectoralis minor muscle that was thought to have caused the thrombosis, and postural correction.
The course of the axillary artery is anatomically divided into three parts by the pectoralis minor muscle.
In my clinical experience treating TOS, this technique has worked very well when applied to the upper trapezius, scalenes, the subclavius, and the pectoralis minor muscles.
Damage can express itself not only in soreness, but in headaches when the rhomboids, trapezius, subclavius and pectoralis minor are overused.