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Skeletal Muscles

Human skeletal muscles

TermDefinition
Flexion Decreasing angle between bones, bringing closer together
Extension Increasing angle between bones, moving further apart
Adduction Moving body part towards midline
Abduction Moving body part away from midline
Elevation Lifting body part superiorly
Depression Moving body part inferiorly
Masseter origin Zygomatic arch
Masseter insertion Mandible
Masseter action Elevate mandible
Masseter antagonist Digastricus
Digastricus origin Mastoid process of temporal bone
Digastricus insertion Hyoid
Digastricus action Depress mandible
Digastricus antagonist Masseter
Pectoralis major origin Sternum
Pectoralis major instertion Greater tubercle of humerus
Pectoralis major action Flex shoulder
Pectoralis major antagonist Latissimus dorsi
Latissimus dorsi origin Iliac crest, lower vertebrae
Latissimus dorsi insertion Intertubercular groove of humerus
Latissimus dorsi action Extend shoulder
Latissimus dorsi anagonist Pectoralis major
Biceps brachii origin Coracoid process of scapula
Biceps brachii insertion Radial tuberosity
Biceps brachii action Flex elbow
Biceps brachii antagonist Triceps brachii
Triceps brachii origin Humerus & lateral border of scapula
Triceps brachii insertion Olecranon process of ulna
Triceps brachii action Extend elbow
Triceps brachii antagonist Biceps brachii
Erector spinae/sacrospinalis origin Posterior ribs and vertebrae
Erector spinae/sacrospinalis insertion Anterior ribs and vertebrae
Erector spinae/sacrospinalis action Extend spine
Erector spinae/sacrospinalis antagonist Rectus abdominis
Rectus abdominis origin Pubic symphysis
Rectus abdominis insertion Cartilage & xiphoid process of sternum
Rectus abdominis action Flex spine
Rectus abdominis antagonist Erector spinae/sacrospinalis
Muscles comprising "hamstrings" Biceps femoris, semitendinosus, semimembranosus
Hamstrings origin Ischial tuberosity
Hamstrings insertion Tibia and fibula
Hamstrings action Extend hip & flex knee
Hamstrings antagonist Quadriceps femoris
Muscles comprising quadriceps femoris Vastus medialis, vastus lateralis, rectus femoris, vastus intermedius
Quadriceps femoris origin Ilium, linea aspera, & greater trochanter
Quadriceps femoris insertion Tibial tuberosity
Quadriceps femoris action Flex hip & extend knee
Quadriceps femoris antagonist Hamstrings
Gastrocnemius origin Medial and lateral epicondyles of femur
Gastrocnemius insertion Calcaneus
Gastrocnemius action Plantarflexion
Gastrocnemius antagonist Tibialis anterior
Tibialis anterior origin Lateral condyle of tibia
Tibialis anterior insertion Metatarsals
Tibialis anterior action Dorsiflexion
Tibialis anterior antagonist Gastrocnemius
Tendo calcaneus Achilles tendon
Muscles comprising erector spinae Spinalis, longissimus, iliocostalis, multifidus
Created by: XiaoYiSheng
 

 



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