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Muscles
Origin/Inserion/Action
| Muscle | Origin | Insertion | Action |
|---|---|---|---|
| Masseter | zygomatic arch and bone | mandible angle and ramus | elevates mandible to close jaw (allows you to bite/chew "mastication") |
| Buccinator | molar regions of maxilla and mandible | orbicular oris | compress cheek in whistling, sucking through a straw, and during chewing (compresses food against teeth) |
| Sternocliedomastoid | manubrium of sternum and clavicle | mastoid process | lateral flexion and rotation of the head |
| Trapezius | occipital bone and spinous process of C1-T12 | scapular spine, acromion, and lateral clavicle | elevates, retracts, and rotation of scapula, extends head when stabilizing scapula. shrugging shoulders is using the upper part of trapezius |
| Latissimus Dorsi | spinous process of T6-L5, iliac crest, inferior angle of scapula | intertubercular sulcus of humerous | at shoulder for arm extension, adduction, and medial rotation (think lat pull downs at gym or wide grip pull-ups) |
| Pectoralis Major | sternal end of clavicle, sternum, costal cartilage of ribs 1-6/7 | intertubercular sulcus and greater tubercle of humerous | adducts and medially rotates arm (think "pec fly's" at gym, assists in pushing during bench press) |
| Pectoralis Minor | ribs 3-5 | coracoid process | depresses shoulder, assists in expanding ribs during deep inspiration |
| Serratus Anterior | ribs 1-9 | medial border of scapula | protracts shoulder |
| Rectus Abdominis (Abdominal Muscles) | pubic crest and symphysis | xiphoid process and coastal cartilage of ribs 5-7 | flex trunk at lumbar region, stabilize pelvis when walking |
| External Oblique (Abdominal Muscles) | ribs 5-12 | linea alba, pubic and iliac crest | lateral flexion and rotation of trunk, assists rectus abdominis in trunk flexion |
| Internal Oblique (Abdominal Muscles) | iliac crest, inguinal ligament, lumbar fascia | linea alba, pubic crest, ribs 8-12 | lateral flexion and rotation of trunk, assists rectus abdominis in trunk flexion |
| Transverse Abdominis (Abdominal Muscles) | inguinal ligament, iliac crest, lumbar fascia, ribs 6-12 | linea alba and pubic crest | compress abdominal contents |
| Deltoid | lateral clavicle, spine and acromion of scapula | deltoid tuberosity | adducts and medially rotates arms, assists in arm extension at shoulder |
| Supraspinatus (Rotator Cuff) | supraspinous fossa | greater tubercle | arm abduction |
| Infraspinatus (Rotator Cuff) | infraspinous fossa | greater tubercle | rotates arm laterally |
| Teres Minor (Rotator Cuff) | lateral dorsal scapula | greater tubercle | rotates arm laterally |
| Subscapularis (Rotator Cuff) | subscapular fossa | lesser tubercle | rotates arm medially |
| Teres Major | posterior surface of inferior angle of scapula | lesser tubercle | extends, medially rotates, and adducts arm |
| Rhomboid Major | spinous process T2-T5 | medial border of scapula | stabilize and retract scapula |
| Rhomboid Minor | spinous process C7-T1 | medial border of scapula | stabilize and retract scapula |
| Biceps Brachii | short head coracoid process, long head supraglenoid tubercle | common tendon into radial tuberosity | flexes and supination of forearm |
| Triceps Brachii | long head at infraglenoid tubercle, medial and lateral head at the posterior shaft of humorous | common tendon to the olecranon process | extension of forearm |
| Brachialis | anterior humerus | coranoid process | flexes forearm |
| Brachioradialis | distal humerus | radial styloid process | assisting in flexing forearm |
| Gluteus Maximus | doral ilium, sacrum, coccyx | gluteal tuberosity and IT band | extension of thigh |
| Tensor Fasciae Latae | iliac crest and ASIS | IT band | flexes and abducts thigh |
| Biceps Femoris (Hamstrings) | linea aspera and ischial tuberosity | head of fibula and lateral condyle of tibia | flexes leg at knee and thigh extension |
| Semitendinosus (Hamstrings) | ischial tuberosity | tibial shaft | flexes leg at knee and thigh extension |
| Semimembranosus (Hamstrings) | ischial tuberosity | medial condyle of tibia | flexes leg at knee and thigh extension |
| Rectus Femoris (Quadriceps) | ASIS | patella to tibial tuberosity | extends leg at knee |
| Vastus Lateralis (Quadriceps) | linea aspera | patella to tibial tuberosity | extends leg at knee |
| Vastus Medialis (Quadriceps) | linea aspera | patella to tibial tuberosity | extends leg at knee |
| Vastus Intermedius (Quadriceps) | femoral shaft | patella to tibial tuberosity | extends leg at knee |
| Sartorius | ASIS | medial proximal tibia | flexes, abducts, lateral rotation of thigh |
| Gastrocnemius | medial and lateral condyles of femur | calcaneal tendon to calcaneus | plantar flexes foot |
| Soleus | tibia and fibia | calcaneal tendon to calcaneus | plantar flexes foot |
| Fibularis Longus | fibular head/lateral fibula | 1st metatarsal and medial cuneiform | foot extension and plantar flexion |
| Tibialis Anterior | medial condyle and tibial shaft | medial cuneiform and 1st metatarsal | dorsiflexion of foot |
Created by:
nopeitsjustlexi
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