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A&P 1 CH 9-11
Dr. Cutler SU-Skeletal Muscle List-Orgin-Insertion-Action
Name | Origin | Insertion | Action |
---|---|---|---|
PECTORALIS MAJOR | Sternum, clavicle | Humerus | Adduction and medial rotation of humerus |
SERRATUS ANTERIOR | Upper 8 Ribs | Scapula | Protracts shoulder and stabilizes scapula |
RECTUS ABDOMINIS | Pubic symphysis | Costal cartilage, xiphoid process | Flexion of trunk; compresses abdominal contents |
LATISSUMUS DORSI | Vertebrae, ribs, thoracolumbar fascia | Deltoid tuberosity of humerus | Extension and medial rotation of humerus at shoulder |
DELTOIDS | Clavicle, scapula | Deltoid tuberosity | Abduction of humerus to 90 degrees |
TRAPEZIUS | Occipital bone (EOP) and spinous processes to T12 | Clavicle, scapula | Elevate, retract, and depress scapulae |
BICEPS BRACHII | Coracoid process and scapula | Radial tuberosity (bicipital tuberosity on radius) | Flexion at elbow |
TRICEPS BRACHII | Scapula and posterior humerus | Olecranon process of ulna | Extension at elbow |
SARTORIUS | Anterior superior iliac spine (ASIS) | Tibial tuberosity (medial) | Flexion at knee (“tailor’s position”) |
FLEXORS OF FOREARM | Medial epicondyle of humerus | Metacarpals of wrist | Flexion, aBduction, and aDuction of wrist |
RECTUS FEMORIS | Anterior inferior iliac spine (ASIS) and ilium | Tibial tuberosity at patellar tendon | Flexion of hip and extension of knee (crosses both joints) |
TIBIALIS ANTERIOR | Lateral tibia (superior) | Medial metatarsal and tarsal (arch) | Dorsiflexion of ankle |
GASTROCNEMIUS | Epicondyles of femur | Calcaneus via Achilles tendon | Plantarflexion of ankle OR flexion of knee (can’t do both at same time) |
MASSETER | Zygomatic arch | Mandibular ramus (lateral surface of mandible) | Elevates mandible (closes jaw and assists protraction) |
STERNO-CLEIDO-MASTOID | Manubrium, clavicle | Mastoid process | Flex the neck; rotate head to opposite side |