Human Anatomy (muscles)

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Author:
marbury91
ID:
239442
Filename:
Human Anatomy (muscles)
Updated:
2013-10-11 09:35:56
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Anatomy
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Description:
Human muscles (origin, insertion, action, innervation, arterial supply)
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  1. Pectoralis minor
    • Origin -- ribs 3-5
    • Insertion -- coracoid process of scapula
    • Action -- depresses and moves scapula anteriorly; elevates ribs 3-5 during forced inhalation.
    • Innervation -- medial pectoral nerve
    • Arterial supply -- axillary artery branches
  2. Serratus Anterior
    • Origin -- Anterior margins of ribs 1-9
    • Insertion -- Vertebral and inferior scapula.
    • Action -- Rotates scapula upward and laterally.
    • Innervation -- Long thoracic nerve (only muscle it innervates!!)
    • Arterial supply --  Axillary artery branches.
  3. Trapezius
    • Origin -- Occipital bone, nuchae ligament, and spines of thoracic vertebrae
    • Insertion -- Clavicle, acromion process and spine of scapula.
    • Action -- Elevates clavicle, adducts, elevates and depresses scapula; rotates scapula upward; extends neck when shoulder is fixed. 
    • Innervation -- CN XI (cranial nerve 11)
    • Arterial supply -- External carotid and sublavian artery branches
  4. Levator scapulae
    • Origin -- Transverse process of C1-C9
    • Insertion -- Superior vertebral border of scapula
    • Action -- Elevates scapula
    • Innervation -- Dorsal scapular nerve and cervical nerves (cn) 3-5
    • Arterial supply -- Subclavian artery branches
  5. Rhomboid major
    • Origin -- Spinous process of T2-T5
    • Insertion -- Vertebral border of scapula
    • Action -- Adduction and downward rotation of scapula.
    • Innervation -- Dorsal scapular nerve
    • Arterial supply -- Subclavian artery branches.
  6. Rhomboid minor
    • Origin -- Spinous processes of C7-T1.
    • Insertion -- Vertebral border of scapula
    • Action --  Adduction and downward rotation of scapula
    • Innervation -- Dorsal scapular nerve
    • Arterial supply -- Subclavian artery branches.
  7. Pectoralis major
    • Origin -- Medial clavicle
    • Insertion -- Greater tubercle and lateral intertubercular humerus.
    • Action -- Flexes, adducts and rotates arm medially at the shoulder.
    • Innervation -- Medial and lateral Pectoral nerves.
    • Arterial supply -- Axillary artery branches.
  8. Deltoid
    • Origin -- lateral scapula, acromion and spine of scapula.
    • Insertion -- Deltoid tuberosity of scapula.
    • Action -- Abduction of shoulder, flexion and medial rotation of humerus, extension and lateral rotation of humerus. 
    • Innervation -- Axillary nerve
    • Arterial supply -- Axillary and brachial artery branch.
  9. Latissimus dorsi
    • Origin -- Spines of inferior thoracic and all lumbar and sacral vertebrae; thoracolumbar fascia and lower 4 ribs.
    • Insertion -- Intertubercular groove of humerus.
    • Action -- Adducts, extends, and rotates arm medially at the shoulder.
    • Innervation -- Thoracodorsal nerve
    • Arterial supply -- Axillary branches
  10. Teres major
    • Origin -- Inferior angle of scapula
    • Insertion -- Intertubercular groove of humerus
    • Action -- Adducts, extends, and rotates arm medially at shoulder.
    • Innervation -- Lower subscapular nerve
    • Arterial supply -- Axillary nerve
  11. Teres minor
    • Origin -- Lateral border of scapula
    • Insertion -- Greater tubercle of humerus
    • Action -- Extends, adducts and rotates arm LATERALLY at the shoulder.
    • Innervation -- Axillary nerve
    • Arterial supply -- Axillary branch
  12. Supraspinatus
    • Origin -- Supraspinous fossa
    • Insertion -- Greater tubercle of humerus
    • Action -- Assists deltoid in abducting the arm.
    • Innervation -- Suprascapular nerve
    • Arterial supply -- Subclavian artery
  13. Infraspinatus
    • Origin -- Infraspinous fossa
    • Insertion -- Greater tubercle of humerus
    • Action -- Adducts and rotates arm laterally; stabilizes shoulder joint
    • Innervation -- Suprascapular nerve
    • Arterial supply -- subclavian artery
  14. Subscapularis
    • Origin -- subscapular fossa
    • Insertion -- Lesser tubercle of humerus.
    • Action -- rotates arm medially at shoulder
    • Innervation -- Subscapular nerve
    • Arterial supply -- subclavian artery
  15. Biceps brachii
    • Origin -- Coracoid process and supraglenoid tubercle of scapula
    • Insertion -- Radial tuberosity
    • Action -- Flexes arm, flexes and supinates forearm. 
    • Innervation -- Musculocutaneous nerves
    • Arterial supply -- Axillary and brachial artery
  16. Brachialis
    • Origin -- Distal half of anterior humerus
    • Insertion -- Ulnar tuberosity and coronoid process
    • Action -- Flexes forearm at elbow
    • Innervation -- Musculocutaneous nerve
    • Arterial supply -- Brachial artery
  17. Brachioradialis
    • Origin -- Lateral epicondyle of humerus
    • Insertion -- Styloid process of radius
    • Action -- Flexes forearm at elbow
    • Innervation -- Radial nerve
    • Arterial Supply -- brachial artery
  18. Triceps brachii (long head)
    • Origin -- Infraglenoid
    • Insertion -- Olecranon of ulna
    • Action -- Extends arm at elbow and shoulder, and adduction at shoulder
    • Innervation -- Radial nerve
    • Arterial supply -- Deep brachial artery
  19. Triceps brachii (Lateral head)
    • Origin -- Superior, lateral border of humerus
    • Insertion -- Olecranon of ulna
    • Action -- Extends arm at elbow
    • Innervation -- Radial nerve
    • Arterial supply -- deep brachial artery.
  20. Triceps brachii (medial head)
    • Origin -- Posterior surface of humerus
    • Insertion -- Olecranon of ulna
    • Action -- Extension at elbow
    • Innervation -- Radial nerve
    • Arterial supply -- Deep brachial artery.

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