Muscles Flashcards
Trapezius (Middle Division)
Origin: Spinous processes T1-T5
Insertion: Spine of scapula
Action: Elevates scapula
Trapezius (Upper Division)
Origin: Occipital protuberance, superior nuchal line
Insertion: Lateral clavicle, acromion process
Action: Elevates, rotates scapula
Trapezius (Lower Division)
Origin: Spinous process T6-T12
Insertion: spine of scapula
Action: Depress, retract scapula
Deltoid (Middle)
Origin: Acromion process
Insertion: Deltoid tuberosity
Action: Abduction
Deltoid (Anterior)
Origin: Lateral clavicle
Insertion: Deltoid tuberosity
Action: Abduction, horizontal flexion, medial rotation
Deltoid (Posterior)
Origin: Spine of scapula
Insertion: Deltoid tuberosity
Action: Abduction, horizontal extension, lateral rotation
Pectoralis Major (Sternal division)
Origin: Sternum to 7th rib
Insertion: Intertubercular sulcus, greater tubercle
Action: Adduction, medial rotation, horizontal flexion,
Coracobrachialis
Origin: Coracoid process
Insertion: Middle of humerus
Action: Horizontal flexion, adduction
Pectoralis Major (Clavicular division)
Origin: Mid clavicle
Insertion: Intertubercular sulcus, greater tubercle
Action: Shoulder and horizontal flexion, medial rotation
Teres Major
Origin: Inferior angle
Insertion: Intertubercular sulcus of humerus
Action: Medially rotates humerus, shoulder extension
Latissimus Dorsi
Origin: Spinous processes of T6-L5, sacrum, ilium
Insertion: Intertubercular sulcus
Action: Extension, Medially rotates humerus
Infraspinatus
Origin: Infraspinous fossa of scapula
Insertion: Greater tubercle
Action: Lateral rotation of humerus
Supraspinatus
Origin: Supraspinous fossa
Insertion: Greater tubercle
Action: Abduction of humerus
Subscapularis
Origin: subscapular fossa
Insertion: Lesser tubercle
Action: Medial rotation of humerus
Teres Minor
Origin: Lateral border of scapula
Insertion: Greater tubercle
Action: Lateral rotation of humerus
Triceps Brachii
Origin: Infraglenoid tubercle, lateral surface of humerus, posterior surface of humerus
Insertion: olecranon process of ulan
Action: forearm extension
Biceps Brachii
Origin: Supraglenoid tubercle, coracoid process
Insertion: Radial tuberosity
Action: Supinates, flexes forearm
Sternocleidomastoid
Origin: manubrium, clavicle
Insertion: Mastoid process, superior nuchal line
Action: Flexes neck, rotates head
Gluteus Medius
Origin: Iliac crest
Insertion: Greater trochanter
Action: Abducts femur, meidal rotation
Gluteus Maximus
Origin: ilium, sacrum, coccyx
Insertion: Gluteal tuberosity of femur
Action: Thigh extension, Abduction, lateral rotation of hip
Gluteus Minimus
Origin: ilium,
Insertion: Greater trochanter
Action: Abducts femur, medially rotates
Gracilis
Origin: symphysis pubis
Insertion: Anterior medial shaft of tibia
Action: Adducts, medially rotates thigh, knee flexion
Sartorius
Origin: Anterior superior iliac spine
Insertion: Shaft of tibia
Action: Flexes, abducts, laterally rotates thigh
Semitendinosus
Origin: Ischial tuberosity
Insertion: meidal condyle of tibia
Action: knee flexes, medially rotates, adducts
Biceps Femoris
Origin: Ischial tuberosity, Linea aspera
Insertion: Head of fibula, lateral condyle of tibia
Action: Flexion, lateral rotation at knee, hip extension, adduct
Rectus Femoris
Origin: iliac spine, acetabulum
Insertion: Patella to tibial tuberosity
Action: knee extension, hip flexion
Semimembranosus
Origin: ischial tuberosity
Insertion: medial condyle of tibia
Action: Knee flexes, medially rotates leg at knee, extends, adducts
Vastus Medialis
Origin: linea aspera
Insertion: Patella, tibial tuberosity
Action: Extend leg at knee
Vastus Lateralis
Origin: Greater trochanter, linea aspera
Insertion: Patella to tibial tuberosity
Action: Knee extension
Vastus Intermedius
Origin: linea aspera
Insertion: Patella to tibial tuberosity
Action: Extend leg at knee
Soleus
Origin: Head fibula
Insertion: Calcaneus by achilles tendon
Action: Plantar flexion, inversion
Gastrocnemuis
Origin: Lateral condyle, medial condyle of femur
Insertion: calcaneus by achillies
Action: Plantar flexion, inversion
