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A&P Muscles1

MuscleFunctionOrigin
Buccinator Retracts angle of mouth; flattens cheek
Fronatalis- (occipitofronatlis) Moves scalp; elevates eyebrows
Masseter Elevates and protracts mandible; involved in excursion
Occipitalis Elevation of Eyebrows
Orbicularis oculi closes eyelids
Orbicularis oris closes lips
Platysma Depresses lower lip; wrinkles skin of neck and upper chest Deltoid & Pectoralis major Mandible
Sternocleidomastoid "One Contracting alone:laterally flexes head and neck to same side and rotates the head and neck to opposite side Both Contracting together: flexes neck" Manubrium & clavicle Mastoid process
Temporalis Elevates and protracts mandible; involved in excursion
Zygomaticus Major Elevation of the corner of mouth (smile)
Diaphragm Inspiration; depresses floor of thorax
External Intercostals Inspiration; elevates ribs
External Oblique Flexes and rotates vertebral column; compresses abdomen; depresses thorax
Internal Oblique Flexes and rotates vertebral column; compresses abdomen; depresses thorax
Pectoralis Major Flexes shoulder; adducts and medially rotates arm; extends shoulder from flexed position Clavicle Humerus
Pectoralis Minor depresses scapula or elevates ribs
Rectus abdominus flexes and rotates vertebral column; compresses abdomen
Serratus Anterior Rotates and protracts scapulat; elevates ribs
Transverse abdominus Compresses abdomen
Adductor Longus Adducts and laterally rotates thigh; flexes hip
Adductor Magnus "Adductor part: adducts thigh & flexes hip Hamstring part: extends hip"
Biceps Femoris Flexes knee; laterally rotates leg; extends hip Femur Fibula
Fibularis longus Everts and plantar flexes foot fibula first metatarsal bone and cuniform
Gastrocnemius plantar flexes foot; flexes knee Calcaneus femur
Gluteus maximus extends hip; abducts and laterally rotates thigh illium, sacrum and coccyx femur
Gluteus medius abducts and medially rotates thigh;tilts pevis toward supported side
Gracilis Adduction of thigh; flexion of leg
Iliopsoas flexes hip
Rectus Femoris Extension of leg; flexion of thigh; Extensor digitorum longus Anterior inferior iliac spine tibial tuberosity
Sartorius flexes hip and knee; laterally rotates and abducts thight; medially rotates leg Anterior Superior iliac spine tibial tuberosity
Semitendinosous flexes knee; medially rotates leg; extends hip
Semimembranosous Flexes knee; medially rotates leg; tenses capsule of knee joint; extends hip
Soleus plantar flexes foot
Tensor Fascia latae Flexes Hip; Abducts and medially rotates thigh; stabilizes femor on tibia when standing
Tibialis Anterior Dorsiflexes and inverts foot Tibia Cuniform and first metatarsal bone
Vastus intermedius Extends knee
Vastus Lateralis Extends knee
Vastus medialis Extends knee
Biceps Brachii* Flexes shoulder and elbow; supinates forearm and hand scapula radial tuberosity
Brachialis Flexes elbow Humerus Ulna
Brachioradialis Flexes elbow Humerus Radius
Deltoid Flexes and extends shoulder; abducts, medially and laterally rotates arm
Infraspinatus Laterally rotates arm; holds head of humerus in place Scapula Humerus
Latissimus Dorsi Adducts and medially rotates arm; extends shoulder
Palmaris Longus Flexion of wrist (weak); Tense palmar aponeurosis
Subscapularis medially rotates arm; holds head of humerus in place
Supraspinatus Abducts arm; holds head of humerus in place Supraspinous Fossa Humerus
Teres major Extends shoulder; adducts and medially rotates arm Scapula Humerus
Teres minor Laterally rotates and adducts arm; holds head of humerus in place
Trapazius Elevates, depresses, retracts, rotates and fixes scapula; extends neck
Triceps Brachii Extension of forearm; extension of arm (long head) Humerus Ulna
Created by: lynette.thorpe
 

 



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