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Anatomy muscles 2

origin, insertion, action

MuscleOriginInsertionAction
sternocleidomastoid sternum and clavicle mastoid process of temporal bone simultaneous contraction of both muscles of pair causes flexion of neck forward; acting independently, rotate head toward opposite shoulder
pectoralis major clavicle, sternum and cartilage of first 6 ribs Fibers insert by short tendon into greater tubercle of humerus prime mover of arm flexion;adducts, medially rotates arm
deltoid lateral third of clavicle; acromion and spine of scapula deltoid tuberosity of humerus acting as a whole, prime mover of arm abduction;when only specific fibers are active , can aid in flexion, extension, and rotation of humerus
external intercoastals Inferior border of ribs as far back as posterior angles Superior border of ribs below, passing obliquely downwards and backwards Fix intercostal spaces during respiration. Aids forced inspiration by elevating ribs
diaphragm lumbar vertebrae; costal cartilage central tendon of diaphragm increases thoracic cavity volume; inhalation
biceps brachii coracoid process of scapula proximal radius flexes elbow and supinates forearm
triceps brachii glenoid cavity of scapula posterior humerus olecranon process of ulna powerful forearm extensor; antagonist of biceps brachii
flexor carpi radialis medial epicondyle of humerus second and third metacarpals powerful wrist flexor; abducts hand
extensor carpi radialis longus lateral humerus second and third metacarpal extends and abducts wrist
rectus femoris pelvis tibial tuberosity via patellar ligament extends knee and flexes thigh and hip
vastus lateralis greater trochanter of femur tibial tuberosity extends knee
vastus medialis femur tibial tuberosity extends knee
vastus intermedious femur tibial tuberosity extends knee
biceps femoris ischial tuberosity and distal femur tendon passes laterally to insert into head of fibula extends thigh; laterally flexes knee
semitendinosus ischial tuberosity proxiaml tibia extends thigh; flexes knee; medially rotates leg
semimembranosus ischial tuberosity proximal tibia extends thigh; flexes knee; medially rotates leg
tibialis anterior lateral condyles and upper 2/3 of tibia; interosseous membrane by tendon into inferior surface of first cuneiform and metatarsal 1 prime mover of dorsiflexion; inverts foot
gastrocnemius by two heads from medial and lateral condyles of the femur calcaneus via calcaneal tendon plantar flexes foot; crosses knee joint; flexes knee when foot is dorsiflexed
masseter Zygomatic process and arch mandible closes jaw and elevates mandible
temporalis temporal bone mandible closes jaw and elevates mandible
Created by: connar123
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