Anatomy Muscles Chest and Back

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Tainted_Fool
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222081
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Anatomy Muscles Chest and Back
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2013-06-02 18:53:58
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Anatomy Muscles Chest Back
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Anatomy Muscles Chest and Back
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  1. Pectoantebranchialis
    In cats
  2. Pectoralis Major
    Origin?
    Insertion?
    Action?
    • Clavicle, sternum, costal cartilages 1-6
    • Greater tubercle of humerus
    • Flexes arm; adducts and medially rotates arm
  3. Pectoralis Minor
    Origin?
    Insertion?
    Action?
    • ribs 3,4,5
    • Coracoid process of scapula
    • Draws scapula anteriorly and inferiorly
  4. Xiphihumeralis
    In Cats
  5. External Oblique
    Origin?
    Insertion?
    Action?
    • Lower 8 ribs
    • Linea alba and pubic crest and tubercle, iliac crest
    • Flexion and rotation of trunk; lateral flexion
  6. Internal Oblique 
    Origin?
    Insertion?
    Action?
    • Lumbar fascia; iliac crest; inguinal ligament
    • Lower 4 ribs; linea alba; pubic crest
    • Flexion and rotation of trunk; lateral flexion
  7. Transversus Abdominis
    Origin?
    Insertion?
    Action?
    • Cartilages of lower 6 ribs; iliac crest
    • Linea alba and pubic crest
    • Compresses abdominal contents
  8. Rectus Abdominis
    Origin?
    Insertion?
    Action?
    • Pubic crest and pubic symphysis
    • Costal cartilages of ribs 5-7 and xiphoid process
    • Flexes and rotates trunk
    • Note: What you use in sit-ups and curls. This may be difficult to expose, as it is tightly encased in the aponeuroses (tendon sheaths) of lateral muscles.
  9. External Intercostals
    Action?
    Raises ribs for inspiration
  10. Internal intercostals (viewed if external intercostals reflected)
    Action?
    Depresses ribs for forces expiration
  11. Diaphragm
    Origin?
    Insertion?
    Action?
    • Cartilages of lowest ribs, lumbar vertebrae
    • Central tendon
    • Prime mover of inspiration (flattens on contraction)
    • Notes: innervated by phrenic nerve: " C3, C4, C5- keeps the diaphragm alive"
  12. Serratus Ventralis (S. Anterior in human)
    Origin?
    Insertion?
    Action?
    • Ribs 1-8
    • Anterior surface of medial (vertebral) border of scapula
    • Protracts and rotates scapula superiorly and laterally (“boxer’s muscle” - for punching and pushing)
  13. Trapezius
    Origin?
    Insertion?
    Action?
    • Occipital bone, spines of C7 and T1-12 (all thoracic vertebrae)
    • Spine and acromion of scapula, lateral third of clavicle
    • Elevates, depresses, rotates and adducts scapula; secondary: extends head
    • Note: The cat has three separate muscles, named according to insertion; human has one --- Clavotrapezius, Acromiotrapezius, and Spinotrapezius
  14. Deltoid
    Origin?
    Insertion?
    Action?
    • Spine and acromion of scapula, lateral third of clavicle
    • Deltoid tuberosity of humerus
    • Abducts arm (Antagonist of pectoralis major and latissimus dorsi)
    • Note: (Humans) Makes the shoulder round.
    • The cat has three separate muscles, named according to origin; human has one --- Clavodeltoid, Acromiodeltoid, and Spinodeltoid
  15. Latissimus Dorsi
    Origin?
    Insertion?
    Action?
    • Lower 6 thoracic vertebrae, lumbar vertebrae, lower 3-4 ribs, iliac crest
    • Intertubercular sulcus of humerus (near superior end of humerus)
    • Extends arm; adducts and medially rotates arm
  16. Rhomboids (major and minor in human, minor more superior)
    Origin?
    Insertion?
    Action?
    • Spinous processes of C7 - T5
    • Medial border of scapula
    • Stabilize scapula
  17. Supraspinatus
    Origin?
    Insertion?
    Action?
    • Supraspinous fossa of scapula
    • Greater tubercle of the humerus
    • Abducts humerus
  18. Infraspinatus
    Origin?
    Insertion?
    Action?
    • Infraspinous fossa of scapula
    • Greater tubercle of the humerus
    • Lateral rotation of humerus
  19. Subscapularis
    Origin?
    Insertion?
    Action?
    • Subscapular fossa of scapula
    • Lesser tubercle of humerus
    • Medial rotation of humerus
  20. Teres Major
    Origin?
    Insertion?
    Action?
    • Posterior surface of inferior angle of scapula
    • Lesser tubercle of humerus
    • Extends arm; adducts and medially rotates arm (synergist to latissimus dorsi)
  21. Teres Minor
    Origin?
    Insertion?
    Action?
    • Lateral border of scapula
    • Greater tubercle of humerus
    • Lateral rotation of humerus (synergist to infraspinatus)
    • Notes: Diffcult to find in the cat; identify in human only

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