Joint movements, muscle origin/insertion/action facts most relevant to physical therapy practice.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- Deltoid - origin
- Lateral third of clavicle, acromion, spine of scapula
- Deltoid - insertion
- Deltoid tuberosity on lateral humerus
- Deltoid - primary action
- Abduction of shoulder, anterior portion assists flexion, posterior portion assists extension
- Supraspinatus - origin and insertion
- Origin: supraspinous fossa of scapula. Insertion: superior facet of greater tubercle of humerus
- Supraspinatus - primary action
- Initiation of shoulder abduction (first 15 degrees)
- Infraspinatus - origin and insertion
- Origin: infraspinous fossa of scapula. Insertion: middle facet of greater tubercle of humerus
- Infraspinatus - primary action
- External (lateral) rotation of shoulder
- Teres major - origin and insertion
- Origin: dorsal surface of scapula near inferior angle. Insertion: medial lip of intertubercular groove of humerus
- Teres major - primary actions
- Extension, adduction, and internal rotation of shoulder
- Pectoralis major - origin
- Medial clavicle, sternum, costal cartilages 1-6, and fascia of rectus abdominis
- Pectoralis major - insertion
- Lateral lip of intertubercular groove of humerus
- Pectoralis major - primary actions
- Flexion and internal rotation of shoulder, adduction across chest
- Latissimus dorsi - origin and insertion
- Origin: spinous processes T6-S4, iliac crest, ribs 9-12. Insertion: floor of the intertubercular (bicipital) groove of humerus
- Latissimus dorsi - primary actions
- Extension, adduction, and internal rotation of shoulder
- Biceps brachii - origin and insertion
- Origin: short head from coracoid process, long head from supraglenoid tubercle of scapula. Insertion: radial tuberosity and bicipital aponeurosis