Lab 13

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Author:
143tennis
ID:
249012
Filename:
Lab 13
Updated:
2013-11-25 14:07:40
Tags:
Muscles Posterior Body
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Description:
Muscles of the Posterior Body
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  1. Trapezius
    • Origin: occipital bone, ligamentum nuchae, and spinous processes of thoracic vertebrae
    • Insertion: clavicle and scapula (acromion and scapular spine)
    • Action: depends on active region and state of other muscles; may (1) elevate, retract, depress, or rotate scapula upward, (2) elevate clavicle, or (3) extend neck
  2. Supraspinatus
    • Origin: supraspinous fossa of scapula
    • Insertion: greater tubercle of humerus
    • Action: abduction at the shoulder
  3. Infraspinatus
    • Origin: Infraspinous fossa of scapula
    • Insertion: greater tubercle of humerus
    • Action: lateral rotation at shoulder
  4. Subscapularis
    • Origin: subscapular fossa of scapula
    • Insertion: lesser tubercle of humerus
    • Action: medial rotation at shoulder
  5. Teres minor
    • Origin: lateral border of scapula
    • Insertion: passes laterally to reach the greater tubercle of humerus
    • Action: lateral rotation at shoulder
  6. Rhomboid major
    • Origin: spinous processes of superior thoracic vertebrae
    • Insertion: vertebral border of scapula from spine to inferior angle
    • Action: adducts scapula and performs downward rotation
  7. Latissimus dorsi
    • Origin: spinous processes of inferior thoracic and all lumber vertebrae, ribs 8-12, and thoracolumbar fascia
    • Insertion: floor of intertubercular groove of the humerus
    • Action: extension, adduction, and medial rotation at shoulder
  8. Triceps brachii
    • Lateral head
    • Origin: superior, lateral margin of humerus
    • Insertion: olecranon of ulna
    • Action: extension at elbow

    • Long head
    • Origin: infraglenoid tubercle of scapula
    • Insertion: olecranon of ulna
    • Action: as above, plus extension and adduction at the shoulder

    • Medial head
    • Origin: posterior surface of humerus inferior to radial groove
    • Insertion: olecranon of ulna
    • Action: extension at elbow
  9. Extensor carpi radialis longus
    • Origin: lateral supracondylar ridge of humerus
    • Insertion: base of second metacarpal bone
    • Action: extension and abduction at wrist
  10. Extensor carpi ulnaris
    • Origin: lateral epicondyle of humerus; adjacent dorsal surface of ulna
    • Insertion: base of fifth metacarpal bone
    • Action: extension and adduction at wrist
  11. Gluteus maximus
    • Origin: iliac crest, posterior gluteal line, and lateral surface of ilium; sacrum, coccyx, and thoracolumbar fascia
    • Insertion: iliotibial tract and gluteal tuberosity of femur
    • Action: extension and lateral rotation at hip
  12. Gluteus medius
    • Origin: anterior iliac crest of ilium, lateral surface between posterior and anterior gluteal lines
    • Insertion: greater trochanter of femur
    • Action: abduction and medial rotation at hip
  13. Biceps femoris
    • Origin: ischial tuberosity and linea aspera of femur
    • Insertion: head of fibula, lateral condyle of tibia
    • Action: flexion at knee; extension and lateral rotation at hip
  14. Semitendinosus
    • Origin: ischial tuberosity
    • Insertion: proximal, medial surface of tibia near insertion of gracilis
    • Action: flexion at knee; extension and medial rotation at hip
  15. Semimembranosus
    • Origin: ischial tuberosity
    • Insertion: posterior surface of medial epicondyle of tibia
    • Action: flexion at knee; extension and medial rotation at hip
  16. Gastrocnemius
    • Origin: femoral condyles
    • Insertion: calcaneus via calcaneal tendon
    • Action: extension (plantar flexion) at ankle; inversion of foot; flexion at knee
  17. Soleus
    • Origin: head and proximal shaft of fibula and adjacent posteromedial shaft of tibia
    • Insertion: calcaneus via calcaneal tendon (with gastrocnemius)
    • Action: extension (plantar flexion) at ankle

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