Quizlet Comparative Anatomy - Cat - Muscles - Shoulder - Superficial

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  1. Acromiodeltoid: Origin - Acromion of scapula. Insertion - Outer surface of spinodeltoid. Action - Flexes and rotates humerus.
  2. Acromiotrapezius: Origin - Spines of cervical vertebrae. Insertion - Spine of scapula. Action - Draws scapula dorsally.
  3. Clavobrachialis: Origin - Clavicle. Insertion - Ulna beneath semilunar notch. Action - Flexes forearm.
  4. Clavotrapezius: Origin - Lambdoidal crest of skull. Insertion - Clavicle. Action - Draws scapula crainiodorsally.
  5. Latissimus dorsi: Origin - Thoracic and lumbar vertebrae. Insertion - Shaft of humerus. Action - Pulls arm caudodorsally.
  6. Levator scapulae ventralis: Origin - Atlas and occipital bone. Insertion - Metacromion process. Action - Draws scapula crainally.
  7. Spinodeltoid: Origin - Spine of scapula. Insertion - Deltoid region of humerus. Action - Flexes and rotates humerus
  8. Spinotrapezius: Origin - Spines of thoracic vertebrae. Insertion - Fasica of scapula muscles. Action - Draws scapula dorsally.