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Muscles: Bio 208

QuestionAnswer
Masseter Origin:Zygomatic Arch Insertion: Mandible Action: Elevates Mandible (chewing)
Temporalis Origin: Temporal Insertion: Mandible Action: Elevates Mandible
Sternocleidomastoid Origin: sternum/clavicle Insertion: Temporal Action: Flexes Neck; rotates side to side
Splenius Capitus Origin:Cervical/thoracic vertebrae Insertion:Occipital/temporal Action: Extends/hyper extends/rotates the head
Exterior Intercostals Origin: Lower border of ribs Insertion: Upper Border of Ribs Action: Elevates Rib cage (aids in inhalation)
Interior Intercostals Origin: Upper boarder of rib Insertion: lower border of ribs Action: Depresses Rib cage (aids in exhalation)
Diaphragm Origin: Lumbar Vertebrae Insertion: Central Tendon of diaphragm Action: Increases thoracic cavity volume (inhalation)
Rectus Abdominus Origin:pubis Insertion: Xiphoid Process; costal cartilage Action: Powerful flexor of lumbar vertebrae
External Oblique Origin:Ribs 5-12 Insertion: Linea Alba/ilium Action: Compresses abdomen (allows flexion and rotation of trunk)
Internal Oblique Origin: Ilium Insertion: Linea Alba; ribs 8-12 Action: Compress Abdomen (allows flexion and rotation of trunk)
Transverse Abdominus Origin: Ilium Insertion: Linea Alba; pubis Action: Compressor of abdomen
Pectoralis Minor Origin:Ribs 3,4,5 Insertion: Scapula Action: Steadies and rotates scapula down
Serratus Anterior Origin: Ribs 1-8 Insertion: Scapula Action: Steadies and rotates scapula up
Trapezius Origin: Occipital; cervical/thoracic vertebrae Insertion: Scapula Action: Elevates and retracts scapula (squaring shoulders)
Levator Scapulae Origin: Cervical Vertebra Insertion: Scapula Action: Elevates and rotates scapula (shrugging shoulders)
Rhomboids Origin: Cervical/Thoracic Vertebrae Insertion: Scapula Action: Elevates and retract scapula (squaring shoulders or rowing a canoe)
Pectoralis Major Origin: Sternum; ribs 1-6; clavicle Insertion: Humerus Action: Flexes, adducts, and medially rotates arm
Latissimus Dorsi Origin: Thoracic-Sacral Vertebrae; ilium Insertion: Humerus Action: Adducts and extends arm at shoulder; brings the arm down with force
Deltoid Origin: Scapula/clavicle Insertion: Humerus Action: Abducts, flexes and extends arm
Subscapularis Origin: Scapula Insertion: Humerus Action: Stabilizes shoulder joint; medially rotates arm
Supraspinatus Origin: Scapula Insertion: Humerus Action: Abducts arm; Stabilizes shoulder joint
Infraspinatus Origin: Scapula Insertion: Humerus Action: Laterally rotates arm; stabilizes shoulder
Teres Minor Origin: Scapula Insertion: Humerus Action: Laterally Rotates Arm; Stabilizes shoulder
Teres Major Origin:Scapula Insertion: Humerus Action: Laterally rotates arm; stabilizes shoulder
Triceps Brachii Origin: Scapula; Humerus Insertion: Ulna Action: Extends arm at elbow
Biceps Brachii Origin: Scapula Insertion: Radius Action: Flexes arm at elbow
Brachialis Origin: Humerus Insertion: Ulna Action: Flexes arm at elbow
Adductors Origin: Pubis Insertion: Femur Action: Flexes and Adducts Hip joint
Tensor Fasciae Latae Origin: Ilium Insertion: Tibia Action: Abducts, flexes, and rotates hip joint
Gluteus Maximus Origin: Ilium; Coccyx Insertion: Femur Action: Extends and laterally rotates at hip joint
Gluteus Medius Origin: Ilium Insertion: Femur Action: Abducts and medially rotates at hip joint
Biceps Femoris Origin: Ischium; femur Insertion: Tibia; fibula Action: Flexes and laterally rotates at knee
Semitendinosus Origin: Ischium Insertion: Tibia Action: Flexes and laterally Rotates at knee
Semimembranosus Origin: Ischium Insertion: Tibia Action: Flexes and laterally rotates at knee
Sartorius Origin: Ilium Insertion: Tibia Action: Flexes knee; Flexion and lateral rotation
Gracilis Origin: Pubis; ischium Insertion: Tibia Action: Flexes knee; adducts hip
Rectus Femorus Origin: Inferior spine; ilium Insertion: Tibia Action: Extends Knee; Flexes hip
Vastus Lateralis Origin: Femur Insertion: Tibia Action: Extends knee
Vastus medialis Origin: Femur Insertion: Tibia Action: Extends knee
Vastus intermedius Origin: Femur Insertion: Tibia Action: Extends knee
Tibialis Anterior Origin: Tibia Insertion: 1st metatarsal Action: Dorsiflexes ankle
Gastrocnemius Origin: Femur Insertion: Calcaneus Action: Plantar flexes ankle; inverts knee; adducts foot and flexes knee
Soleus Origin: Fibula; tibia Insertion: Calcaneus Action: Plantar flexes ankle; inverts and adducts foot
Created by: mariedd
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