UPPER MUSCLES Muscles of the face and mastication

UPPER MUSCLES

Muscles of the face and mastication 1. Masseter • Action - Elevates mandible 2. Temporalis • Action - Elevates mandible

Muscles of the anterior triangle of the neck 1. 2. 3. 4. 5. 6. 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.

Muscles of the anterior triangle of the neck

Muscles that act on the scapula 1. 2. 3. 4. 5. 6. 7. 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 Rhomboideus Action - Adducts scapula

Muscles that act on the scapula

Muscles that act on the arm 1. 2. 3. 4. 5. 6. 7. 8. 9. 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

Muscles that act on the arm

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

Muscles that act on the forearm (radius and ulna)

Muscles that act on the wrists, hands and fingers 1. Extensor Carpi radialis longus Action - Extend wrist 2. Extensor Carpi radialis brevis Action - Extend wrist 3. Extensor Carpi ulnaris Action - Extend wrist 4. Extensor Digitorum Action - Extend fingers 5. Extensor Digiti Minimi Action - Extends 5 th digit 6. Flexor Carpi Radialis Action - Flex wrist 7. Flexor Carpi Ulnaris Action - Flex wrist 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

Muscles that act on the wrists, hands and fingers