pectoral muscles


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

pectoral muscles

The group of muscles, consisting of the pectoralis major and minor on either side, covering the upper ribs on either side of the front of the chest. The pectoral muscles help to control the shoulder-blade (scapula) and, through it, to move the arm forward and down, and, acting directly on the arm, to pull it towards the body.
Figure 1: Efferent nerve pathways from the brainstem and spinal cord. Shown on the right: somatic, to skeletal muscles. Shown on the left: autonomic. B brain stem, C cervical, T thoracic, L lumbar, S sacral segments of the spinal cord. (Red shaded regions are those with no autonomic outflow.)

pectoral muscles

group of muscles on the front of the chest which link the trunk to the upper limb. pectoralis major the largest and most superficial, takes origin from the clavicle, sternum and ribs and crosses the front of the shoulder to insertions into the clavicle and humerus. See Figure 1.

pectoral

1. of or pertaining to the chest.
2. relieving disorders of the respiratory tract, as an expectorant.

pectoral girdle
in birds is the three pairs of bones that support the wings: the furculae (fused clavicles), coracoids and scapulae. In mammals the coracoids and clavicles are often reduced, making the girdle incomplete.
pectoral limb
the forelimb.
pectoral muscles
extrinsic muscles of the forelimb arising from the brisket (ventral chest). See also Table 13. Outbreaks of defective development of these muscles are recorded in cattle.
pectoral myopathy
a meat hygiene term for the lesions found in turkey and meat chicken breasts causing rejection of the meat. Called also green muscle disease.
References in periodicals archive ?
Pectoral muscle biopsy samples taken before experimental infections were free of parasites.
The cross-sectional shape of pectoral muscles is positively correlated with the pectoral mass in small birds (Selman and Houston 1996); therefore, visual assessments of the cross-sectional shape of pectoral muscles should provide a suitable index of pectoral-muscle size.
It has the classic Olympic swimmer shape--broad shoulders, long front limbs with giant paddles, and huge pectoral muscles.
I've been doing this exercise for years and it definitely works on those pectoral muscles above the bust.
BENCH PRESS: Bring the bar up over your head take the arms straight out above you to work the pectoral muscles.
I wanted to devise an exercise that involved only the torso muscles, latissimus, and pectoral muscles -- an exercise that didn't move your hand directly.
PECTORAL A word that means relating to the chest, as in the major and minor pectoral muscles.
The pectoral muscles will come into play on an overhand serve.
This paper presents a case of rhabdomyosarcoma in a free-ranging yellow-headed caracara (Milvago chimachima), originating from the muscle region of proximal left humerus, with metastases in the left pectoral muscles, heart, lungs, and proventriculus.
A bent-arm fly (using dumbbells or manual resistance) is an excellent single-joint movement with which to provide direct resistance to the pectoral muscles.
Team manager Mick Kearney said: "Keith has a tear of one of his pectoral muscles.
Pectoral muscles come into play on an overhand serve.