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Muscle origins1
Muscle origins
Muscle | Origin | Insertion | Joint Action |
---|---|---|---|
Rectus Abdominus | pubic crest and pubic symphysis | ribs and xiphoid process | flexes vertebral column |
External Oblique | lower eight ribs | linea alba and aponeurosis of the external abdominal oblique | assists in flexion and rotation of vertebral column |
Internal Oblique | lumbodorsal fascia and iliac crest | linea alba and aponeurosis of internal abdominal oblique | assists in flexion and rotation of vertebral column |
Transversus Abdominus | inguinal ligament, iliac crest, cartilage of last 5-6 ribs, ilium | linea alba and pubic crest | compresses abdominal contents |
Gluteus Maximus | posterior ilium, sacrum, and coccyx | iliotibial tract, gluteal tuberosity of femur | extends and laterally rotates hip |
Pectoralis Major | sternum, clavicle, and ribs | greater tubercle and along intertubercular groove of the humerus | flexes, medially rotates, and adducts arm |
Pectoralis Minor | ribs 3-5 | coracoid process of the scapula | depresses and pulls scapula anteriorly |
Serratus Anterior | ribs | vertebral border of the scapula | draws scapula forward along thoracic wall and rotates scapula |
Trapezius | occipital bone, cervical and thoracic vertebrae | lateral 1/3 of clavicle and scapular spine and acromion | elevates, depresses, rotates, adducts scapula |
Deltoid (anterior) | |||
Deltoid (middle) | |||
Deltoid (posterior) | |||
Latissimus Dorsi | lumbodorsal fascia via thoracic and lumbar vertebrae, sacrum, ilium | intertubercular groove of the humerus | extends, adducts, and medially rotates arm |
Rhomboids | spinous processes of thoracic vertebrae | vertebral border of the scapula | adducts, rotates scapula |
Adductor Magnus | inferior ramus of pubis and ischium, ischial tuberosity | lineas aspera of femur | adducts and flexes thigh at hip |
Tensor Fasciae Latae | anterior superior iliac spine, iliac crest | iliotibial tract | flexes and abducts thigh |
Triceps Brachii | |||
Biceps Brachii | |||
Brachialis | anterior humerus | coronoid process of the ulna | flexes forearm |
Pronator Teres | medial epicondyle of the humerus | radius | pronates forearm |
Supinator | lateral epicondyle of the humerus | proximal end of radius | supinates forearm |
Flexor Digitorum | |||
Extensor Digitorum | tibia | philanges | flex foot |
Sartorius | anterior superior iliac spine | medial aspect of knee | flexes, laterally rotates thigh |
Rectus Femoris | anterior inferior iliac spine | patella and tibial tuberosity | extends knee, flexes thigh at hip |
Vastus Intermedius | shaft of the femur | patella and tibial tuberosity | extends knee |
Vastus Lateralis | greater trochanter of the femur | patella and tibial tuberosity | extends knee |
Vastus Medialis | linea aspera | patella and tibial tuberosity | extends knee, stabilize patella |
Tibialis Anterior | lateral condyle of tibia | tarsals | dorsiflexion, inverts foot, support arch |
Biceps Femoris | ischial tuberosity(l) linea aspera/distal femur(s) | fibula, lateral tibia | extends thigh, flex knee , LATERAL rotate |
Semitendinosus | ischial tuberosity | upper tibial shaft | extends thigh, flex knee, medial rotate leg |
Semimembranosus | ischial tuberosity | medial condyle of tibia | extends thigh, flex knee, medial rotate leg |
Gastrocnemius | femur | calcaneus | extend foot, flex lower leg |
Soleus | tibia | calcaneus | extend foot |
Peroneus Longus | |||
Sternocleidomastoid | manubrium and clavicle | mastoid process of temporal bone | rotates head, flexes cervical vertebrae |
Spinalis | upper lumbar, lower thoracic vertebrae | vertebrae | extends vertebrae |
Iliocostalis | ribs | ribs | draws ribs together |
Longissimus | vertebrae, transverse process | vertebrae | extends vertebrae |
Semispinalis | |||
Iliposoas | iliac fossa, transverse processes of lumbar vertebrae | lesser trochanter of the femur | flexes hip |