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Midterm Muscles O, I, A, I, B

Terms in this set (60)

Subclavius (Origin, Insertion, & Action)
O: Junction of 1st rib/costal cartilage
I: Subclavian groove (inferior surface of middle 1/3 of clavicle)
A: anchors, depresses, and stabilizes clavicle
Trapezius (Origin, Insertion, & Action)
O: Base of skull, nuchal ligament, and spinal processes (C7-T12)
I: Lateral 1/3 of Clavicle, Acromion, and spine of scapula
A: Elevates, depresses, and rotates the scapula-> Glenoid fosse up
Latissimus dorsi (Origin, Insertion, & Action)
O: Thoracolumbar Fascia, Spinous processes of lower thoracic vertebrae, and iliac crest
I: Floor of Intertubercular groove of humerus
A: Extension of humerus at shoulder joint, adduction, and medial rotation of humerus
Levator scapulae (Origin, Insertion, & Action)
O: Transverse Processes: C1-C4
I: Medial boarder of scapula- at level above spine of scapula
A: Elevates, and rotates the scapula (rotates glenoid fossa down)
Rhomboid major (Origin, Insertion, & Action)
O: Spinous Processes: T2-T5
I: Medial boarder of scapula- at level Below spine of scapula
A: Retract and rotate scapula (rotates glenoid fossa down)
Rhomboid minor (Origin, Insertion, & Action)
O: Spinous Processes (C7-T1)
I: Medial boarder of scapula- at level of spine of scapula
A: Retract and rotate scapula (rotates Glenoid Fossa Down)
Serratus posterior superior (Origin, Insertion, & Action)
O: nuchal ligament, and spinous processes of C7-T3
I: Superior boarders of ribs 2-5
A: Elevate ribs to aid in respiration
Serratus posterior inferior (Origin, Insertion, & Action)
O: Spinous Processes of T11-L2
I: Inferior boarders of ribs 9-12
A: Pulls down ribs to aid in respiration
Pectoralis major (Origin, Insertion, & Action)
O of clavicular head: anterior surface of the medial half of clavicle
O of Sternocostal head: Anterior surface of the sternum, superior 6 costal cartilage's, aponeurosis of the external oblique muscle
I: Lateral lip of the intertubercular groove of the humerus
A: adduction, medial rotation, and flexion (clavicular head) of humerus at shoulder joint
Pectoralis minor (Origin, Insertion, & Action)
O: ribs 3-5
I: coracoid process of scapula
A: moves scapula up and down and stabilizes it by drawing it inferiorly and anteriorly against the thoracic wall (aka breathing)
Serratus anterior (Origin, Insertion, & Action)
O: ribs 1-8: external surface of lateral part
I: anterior surface of medial border of scapula
A: protracts, upwardly rotates, and stabilizes the scapula (stabilizes by drawing it anteriorly against the thoracic wall
Deltoid (Origin, Insertion, & Action)
O: lateral 1/3 of clavicle, acromion of scapula, spine of scapula
I: deltoid tuberosity of humerus
A: flex/medially rotate arm (anterior), abduct arm (middle) and extend/laterally rotate arm (posterior)
Teres major (Origin, Insertion, & Action)
O: posterior aspect of inferior angle of scapula
I: medial lip of the intertubercular groove of humerus
A: adduction, and medial rotation of humerus
Teres minor (Origin, Insertion, & Action)
O: lateral boarder of scapula
I: greater tubercle of humerus- inferior facet
A: lateral rotation of humerus and stabilizes shoulder joint
Supraspinatus (Origin, Insertion, & Action)
O: supraspinous fossa of scapula
I: greater tubercle of humerus: Superior facet
A: abduction of humerus and stabilizes shoulder joint
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