Anterior Muscles of Thorax, Shoulder, and Abdominal Wall

11 cards·by bpieri

Pectoralis Major

covers upper portion of chest, prime mover of arm flexion, medially rotates arm, pulls chest upward

serratus anterior

located on lateral rib cage; moves scapula forward toward chest wall; rotates scapula

deltoid

triangular shoulder muscle, prime mover of arm abduction, can aid in flexion, extension, and rotation of humerus

pectoralis minor

located beneath the pectoralis major, draws scapula forward and inferiorly

external intercostals

pulls ribs toward one another to elevate rib cage; aids in inspiration

internal intercostals

draws ribs together to depress rib cage; aids in forced expiration

diaphragm

forms floor of thoracic cavity; prime mover of inspiration; dome-shaped

rectus abdominis

flexes and rotates vertebral column; fixes and depresses ribs; stabilizes pelvis duringwalking; used in sit ups and curls

external oblique

most superficial lateral muscle; aids in lateral flexion, used in oblique curls

internal oblique

same function as external oblique, only difference is that most fibers run at right angles

transversus abdominis

deepest muscle of abdominal wall; compresses abdominal contents