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UPPER MUSCLES

UPPER MUSCLES. Muscles of the face and mastication. Masseter Action - Elevates mandible Temporalis Action - Elevates mandible. Muscles of the anterior triangle of the neck. Digastric Action -Elevates hyoid bone Mylohyoid Action -Elevates hyoid bone Sternohyoid

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UPPER MUSCLES

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  1. UPPER MUSCLES

  2. Muscles of the face and mastication • Masseter • Action - Elevates mandible • Temporalis • Action - Elevates mandible

  3. Muscles of the anterior triangle of the neck • Digastric Action -Elevates hyoid bone • Mylohyoid Action -Elevates hyoid bone • Sternohyoid Action - Depresses hyoid bone and hence larynx • Sternothyroid Action - Depresses larynx • Thyrohyoid Action - Elevates larynx or depresses hyoid bone • Sternocleidomastoid Action - Flexes and laterally rotates cervical spine.

  4. Muscles of the anterior triangle of the neck

  5. Muscles that act on the scapula • Clavo-trapezius Action - Elevates and rotates scapula • Acromio-trapezius Action - Adducts scapula • Spinotrapezius Action - Depress scapula • Pectoralis Minor Action - Depress scapula • Levator scapulae Action - Elevate scapula • Serratus Anterior Action - Anterior rotation of scapula 7. Rhomboideus Action - Adducts scapula

  6. Muscles that act on the scapula

  7. Muscles that act on the arm • Pectoralis Major Action - Flex and adducts humerus • Clavo-deltoid Action - Flex humerus • Acromio-deltoid Action - Abduct humerus • Spino-deltoid Action - Extend humerus • Infraspinatus Action - Lateral rotation humerus • Supraspinatus Action - Abduct humerus • Subscapularis Action - Medial rotation humerus • Latissimus dorsi Action - Adduct humerus • Teres Major Action - Adduct humerus

  8. Muscles that act on the arm

  9. Muscles that act on the forearm (radius and ulna) 1. Triceps Brachii Action - Extend forearm 2. Biceps Brachii Action - Flex forearm 3. Brachialis Action - Flex forearm 4. Brachioradialis Action - Flex forearm 5. Pronator Teres Action - Pronation 6. Supinator Action - Supination

  10. Muscles that act on the forearm (radius and ulna)

  11. Muscles that act on the wrists, hands and fingers • 8. Palmaris Longus • Action - Flex wrist • 9. Flexor Digitorum Profundus • Action - Flex fingertips • 10. Flexor Digitorum Superficialis • Action - Flex middle phalanges • 11. Abductor Pollicis Brevis • Action - Abduct thumb • Extensor Carpi radialis longus Action - Extend wrist • Extensor Carpi radialis brevis Action - Extend wrist • Extensor Carpi ulnaris Action - Extend wrist • Extensor Digitorum Action - Extend fingers • Extensor Digiti Minimi Action - Extends 5th digit • Flexor Carpi Radialis Action - Flex wrist • Flexor Carpi Ulnaris Action - Flex wrist

  12. Muscles that act on the wrists, hands and fingers

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