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Muscular System

Part A-Insertion, Origins, Actions

QuestionAnswer
Masseter O: Maxilla and Zygomatic arch I: Mandible A: Elevates mandible (jaw closure)
Sternocleidomastoid O: Sternum and Clavicle of temporal bone I: Mastoid process A: Stimultaneous contraction flexes neck; acting singly laterally rotates head
External Oblique O:Ribs 5-12 I:Iliac crest and linea alba A:Acting t/g, flexes vertebral column and compresses abdomen; acting singly laterally flexes vertebral column
Rectus Abdominis O:Pubic crest and pubic symphysis cartilages of ribs 5-7 I:Xiphoid process and costal A:Flexes vertebral column compresses abdomen
Trapezius O:Occipital bone, spine of C7, and all thoracic vertebrae I:Acromion and spine of scapula and clavicle A:Stablizes, elevates, retracts, and rotates scapula
Rhomboideus Major O:Spinous processes T2-T5 I:Vertebral (medial) border of scapula A:Retracts scapula
Serratus Anterior O:Ribs 1-8 I:Vertebral (medial) border of scapula A:Protracts scapula
Petorails Major O:Clavicle, sternum, costal cartilage of ribs 1-6 I:Greater tubercle and intertubercular groove (sulcus) of humerus A:Flexes, adducts, and medially rotates arm (shoulder)
Deltoid O:Clavicle, acromion, and spine of scapula I:Deltoid tuberosity of humerus A:Flexes, adducts, and extends arm (shoulder)
Latissimus dorsi O:Spinous processes of T6-L5, sacrum and ilium I:Intertubercular groove (sulcus) of humerus A:Adducts, extends, and medially rotates arm (shoulder)
Supraspinatus O:Supraspinous fossa of scapula I:Greater tubercle of humerus A:Abducts arm (shoulder)
Infraspinatus O:Infraspinatus fossa of scapula I:Greater tubercle of humerus A:Adducts and laterally rotates arm (shoulder)
Teres Minor O:Inferior lateral border of scapula I:Greater tubercle of humerus A:Adducts, extends, and laterally rotates arm (shoulder)
Subscapularis O:Subscapular fossa of scapula I:Lesser tubercle of humerus A:Adduccts, extends, and laterally rotates arm (shoulder)
Biceps brachii O:Short Head-coracois process of scapula Long Head-above glenoid cavity I:Radial tuberosity of radius A:Flexes and supinates forearm (elbow)
Triceps brachii O:Posterior humerus and below glenoid cavity I:Olecranon process of ulna A:Extends foreman (elbow)
Brachialis O:Distal humerus I:Coronoid process of ulna A:Flexes forearm )elbow)
Brachioradials O:Distal humerus I:Styloid process of radius A:Flexes forearm (elbow)
Flexor carpi radialis O:Medial epicondyle of humerus I:2nd and 3rd metacarpals A:Flexes wrist, abducts hand (radial deviation)
Flexor carpi ulnaris O:Medial epicondyle of humerus and olecranon process I:5th metacarpal and lateral carpal bones A:Flexes wrist, adducts hand (ulnar deviation)
Flexor digitorum profundus O:Anterior medial surface of ulna I:Distal phalanges of digits 2-5 A:Flexes wrist and digits 2-5
Extensor carpi radialis longus O:Distal humerus I:2nd metacarpal A:Extends wrist, abducts hand (radial deviation)
Extensor digitorum O:Lateral epicondyle humerus I:Distal and middle phalanges of digits 2-5 A:Extends wrist and digits 2-5
Extensor carpi ulnaris O:Lateral epicondyle of humerus I:5th metacarpal A:Extends wrist, adducts hand (ulnar deviation)
Iliacus O:Iliac fossa I:Lesser trochanter of femur A:Flexes and laterally rotates thigh
Psoas major O:Lumbar vertebra I:Lesser trochanter of femur A:Flexes and laterally rotates thigh
Gluteus maximus O:Iliac crest, sacrum, and coccyx I:Upper part of linea aspera and iliotibial tract A:Extends and laterally rotates thigh
Gluteus medius O:Ilium I:Greater trochanter of femur A:Abducts and medially rotates thigh
Tensor fasciae latae O:Iliac crest I:Tibia via iliotibial tract A:Flexes and abducts thigh
Adductor magnus O:Pubis and ischium I:Linea aspera of femur I:Linea aspera of femur A:Adducts and extends thigh
Adductor longus O:Pubic crest and pubic symphysis I:Linea aspera of femur A:Adducts and flexes thigh
Rectus femoris O:Anterior Inferior iliac spine I:Tibial tuberosity via patellar ligament A:Extends leg (knee), flexes thigh (hip)
Vastus medialis O:Linea aspera of femur I:Tibial tuberosity via patellar ligament A:Extends leg (knee)
Vastus lateralis O:Greater trochanter and linea aspera of femur I:Tibial tuberostiy via patellar ligament A:Extends leg (knee)
Vastus intermedius O:Anterior femur I:Tibial tuberosity via patellar I:Tibial tuberosity via patellar ligament A:Extends leg (knee)
Sartorius O:Anterior superior iliac spine I:Medial tibia A:Flexes leg (knee, flexes, abducts, and laterally rotates thigh (hip)
Biceps femoris O:Ischial tuberosity and linea aspera of femur I:Head of fibula and lateral condyle of tibia A:Flexes leg (knee), extends thigh (hip)
Semitendinosus O:Ischial tuberosity I:Proximal tibia A:Flexes leg (knee), extends thigh (hip)
Semimembranosus O:Ischial tuberosity I:Medial condyle of tibia A:Flexes leg (knee), extends thigh (hip)
Tibialis anterior O:Proximal tibia I:1st metatarsal A:Dorsiflexes and inverts foot (ankle)
Gastrocnemius O:Lateral and medial condyles of femur I:Calcaneus via calcaneal (Achilles) tendon A:Plantar flexes foot (ankle), flexes leg (knee)
Soleus O:Head of fibula and medial tibia I:Calcaneus via calcaneal (Achilles) tendon A:Plantar flexes foot
Created by: sweetlatrece