HBS Muscle Origin, Insertion, Action Questions And Answers Graded A+

Teres Minor (origin) - middle part of lateral edge of scapula Teres Minor (insertion) - dorsal face of humerus Teres Minor (action) - laterally rotates arm Infraspinatus (origin) - large inferior fossa on back of scapula Infraspinatus (insertion) - Middle facet of greater tuberosity of humerus Infraspinatus (action) - external rotation of humerus Supraspinatus (origin) - smaller superior fossa on back of scapula Supraspinatus (insertion) - top facet of greater tuberosity of humerus Supraspinatus (action) - rotator muscle that abducts the arm at the shoulder Teres Major (origin) - bottom edge of scapula Teres Major (insertion) - medial edge of groove in humerus Teres Major (action) - medial rotator and abductor of humerus Semimembranosus (origin) - Inferior edge of ischiumSemimembranosus (insertion) - posterior medial condyle of tibia Semimembranosus (action) - Flexes and medially rotates leg at knee Semitendinosus (origin) - Inferior edge of ischium Semitendinosus (insertion) - proximal tibia Semitendinosus (action) - flexes and medially rotates leg at knee Bicep Femoris (origin) - inferior edge of ischium Bicep Femoris (insertion) - lateral side of the head of the proximal fibula Bicep Femoris (action) - flexes leg and laterally rotates leg at knee Latissimus Dorsi (origin) - Spinous processes of vertebrae Latissimus Dorsi (insertion) - groove on front of the proximal humerus Latissimus Dorsi (action) - extends, adducts, and medially rotates arm Trapezius Pars Spinalis (origin) - Spinous processes of the vertebrae Trapezius Pars Spinalis (insertion) - Superior portion of the scapula Trapezius Pars Spinalis (action) - Pulls scapula back and rotates itTrapezius Pars Acromialis (origin) - Spinous processes of vertebrae Trapezius Pars Acromialis (insertion) - medial margin of acromial process and distal end of scapular spine Trapezius Pars Acromialis (action) - retracts and adducts scapula Trapezius Pars Clavicularis (origin) - Inferior edge of occipital bone