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30 terms

Isolated and Integrated muscle functions

muscle and functions
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Transverse abdominis
Lies deep to the internal and external abdominal and works with them to compress the abdomen.
Diaphragm
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.
Quadratus Lumborum
Arises from the iliac crest which extends between the transverse processes of the 5th lumbar vertebra
Multifidus
Acts primarily as a sagital rotator
Latissimus dorsi
A strong extensor, internal rotator, and adductor of the glenohumeral joint
Serratus Anterior
Protracts the scapula and is active in reaching and pulling
Rhomboids
Adduct the scapula and rotate downward
Lower Trapezius
Causes scapula depression
Middle Trapezius
Causes scapula retraction
Upper Trapezius
Cause upward motion of the scapula
Pectoralis Major
The anterior muscles of the shoulder joint. A prime mover inadduction, horizontal adduction, and internat rotation of the humerus.
Pectoralis Minor
Causes protraction, downward rotation, and depression of the scapula
Anterior Deltoid
Responsible for shoulder flexion, horizontal adduction, and internal rotation of the glenohumeral
Middle Deltoid
A powerful abductor of the glenohumeral joint
Posterior Deltoid
Glenohumeral extension, horizontal abduction, and external rotation oppose those of the anterior deltoid.
Teres Major
Extends, adducts and medially rotate the humerus at the shoulder joint.
Teres Minor
Inserts on the humerus and extends the humerus.
Infraspinatus
Rotates the shoulder laterally
Subscapularis
Acts to rotate the humerus medialy and stabilizes the shoulder joint
Supraspinatus
Inserts on the humerus and abducts the shoulder
Biceps Brachii
Affects the shoulder, elbow and radioulnar joints
Triceps Brachii
The chief extensor of the elbow; in addition the long head stabilizes the shoulder joint
Brachioradialis
Flexes the forearm at the elbow
Brachialis
The strongest flexor of the elbow.
Levator Scapulae
Produces elevation and downward rotation of scapula and also act on the neck
Sternocleidomastoid
Contraction of one side: laterally flexes neck, rotates head to opposite side; Contraction of both sides together: flexes neck
Scalenes
flex neck (when 1st rib is fixed); elevate 1st and 2nd ribs during forced inhalation when neck is fixed
Longus Colli
Acts to flex and rotate the neck
Longus Capitis
Inserts on the occipital bone to flex the atlanto-occipital joint

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