Lies deep to the internal and external abdominal and works with them to compress the abdomen.
Large, flat muscle at the bottom of the chest cavity that helps with breathing
Superficial Erector Spinae; Illiocostalis, longissimus, and spinalis
The erector group which lies lateral and superficial to the multifidus allow for extension and posterior translation when the muscles are contracted bilaterally.
Arises from the iliac crest which extends between the transverse processes of the 5th lumbar vertebra
Acts primarily as a sagital rotator
A strong extensor, internal rotator, and adductor of the glenohumeral joint
Protracts the scapula and is active in reaching and pulling
Adduct the scapula and rotate downward
Causes scapula depression
Causes scapula retraction
Cause upward motion of the scapula
The anterior muscles of the shoulder joint. A prime mover inadduction, horizontal adduction, and internat rotation of the humerus.
Causes protraction, downward rotation, and depression of the scapula
Responsible for shoulder flexion, horizontal adduction, and internal rotation of the glenohumeral
A powerful abductor of the glenohumeral joint
Glenohumeral extension, horizontal abduction, and external rotation oppose those of the anterior deltoid.
Extends, adducts and medially rotate the humerus at the shoulder joint.
Inserts on the humerus and extends the humerus.
Rotates the shoulder laterally
Acts to rotate the humerus medialy and stabilizes the shoulder joint
Inserts on the humerus and abducts the shoulder
Affects the shoulder, elbow and radioulnar joints
The chief extensor of the elbow; in addition the long head stabilizes the shoulder joint
Flexes the forearm at the elbow
The strongest flexor of the elbow.
Produces elevation and downward rotation of scapula and also act on the neck
Contraction of one side: laterally flexes neck, rotates head to opposite side; Contraction of both sides together: flexes neck
flex neck (when 1st rib is fixed); elevate 1st and 2nd ribs during forced inhalation when neck is fixed
Acts to flex and rotate the neck
Inserts on the occipital bone to flex the atlanto-occipital joint