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human anatomy
Muscle grouping and action
| Term | Definition |
|---|---|
| (muscles of facial expression) FRONTIAL | Raises eyebrows |
| (muscles of facial expression) OCCIPITALIS | Pulls scalp posteriorly; insertion for aponeurosis |
| (muscles of facial expression) CORRUGATOR SUPERCILLI | Lowers eyebrows (scowling and frowning) |
| (muscles of facial expression) ORBICULARIS OCULI | Closes eyelids and furrows brow |
| (muscles of facial expression) ZYGOMATICUS MAJOR | Raises corner of mouth; smiling |
| (muscles of facial expression) RISORIUS | Pulls corner of mouth laterally; pursing of lips; grinning |
| (muscles of facial expression) ORBICULARIS ORIS | Closes and protrudes lips; closes mouth; whistling |
| (muscles of facial expression) MENTALIS | Pulls chin up, protrudes lips; pouting |
| (muscles of facial expression) BUCCINATOR | Movement of cheeks; suckling, whistling, aids in mastication |
| (muscles of facial expression) PLATYSMA | Depresses mandible; moves skin of neck |
| (Extrinsic eye and orbit muscles) SUPERIOR RECTUS | Moves eyes up and medially |
| (Extrinsic eye and orbit muscles) INFERIOR RECTUS | Moves eyes down and medially |
| (Extrinsic eye and orbit muscles) MEDIAL RECTUS | Moves eyes medially |
| (Extrinsic eye and orbit muscles) LATERAL RECTUS | Moves eyes laterally |
| (Extrinsic eye and orbit muscles) SUPERIOR OBLIQUE | Moves eyes down and laterally |
| (Extrinsic eye and orbit muscles) INFERIOR OBLIQUE | Moves eyes up and laterally |
| (muscles of mastication, lower jaw) MASSETER | Elevates mandible; chewing |
| (muscles of mastication, lower jaw) TEMPORALIS | Elevates mandible; lateral movement of chewing |
| (muscles of mastication, lower jaw) MEDIAL PTERYGOID | Elevates mandible; chewing |
| (muscles of mastication, lower jaw) LATERAL PTERYGOID | Depresses mandible; chewing |
| (muscles of tongue and swallowing) GENIOGLOSSUS | Moves tongue down; sticks tongue out of mouth |
| (muscles of tongue and swallowing) STYLOGLOSSUS | Moves tongue up; retracts tongue back into mouth |
| (muscles of tongue and swallowing) STYLOHYOID, MYLOHYOID, GENIOHYOID | Elevates hyoids; depresses mandible |
| (muscles of tongue and swallowing) OMOHYOID | Depresses hyoid |
| (muscles of tongue and swallowing) PHARYNGEAL CONSTRICTORS | Helps to initiate swallowing |
| (muscles of tongue and swallowing) DIGASTRIC | Elevates hyoid; raises larynx allowing epiglottis to cover glottis for swallowing |
| (muscles that move the head and neck) STERNOCLEIDOMASTOID | Flex neck, flex and extend head to opposite side |
| (muscles that move the head and neck) SCALENES | Elevates 1st rib, flexes neck forward and laterally, rotates neck |
| (muscles of thorax, breathing) DIAPHRAGM | Prime mover if respiration; assists with abdominal pressure for micturition, defecation and parturition |
| (muscles of thorax, breathing) EXTERNAL INTERCOSTALS | Breathing |
| (muscles of thorax, breathing) INTERNAL INTERCOSTALS | Forceful exhalation |
| (abdominal muscles) RECTUS ABDOMINIS | Tenses abdominal wall; flexion of vertebral column; sitting up |
| (abdominal muscles) EXTERNAL OBLIQUE | Compresses abdominal wall; flexion of vertebral column; twist at waist |
| (abdominal muscles) INTERNAL OBLIQUE | Compresses abdominal wall; flexion of vertebral column; twist at waist |
| (abdominal muscles) TRANVERSE ABDOMINIS | compresses abdominal wall; assists with micturition, defecation and parturition |
| (muscles of the pelvic floor and perineum) EXTERNAL URETHRAL SPHINCTER | Voluntary constriction of urethral opening for urination (micturition) |
| (muscles of the pelvic floor and perineum) EXTERNAL ANAL SPHINCTER | Constricts anal canal |
| (muscles of the pelvic floor and perineum) ISCHIOCAVERNOSUS | Compresses veins to maintain erection of penis in males or clitoris in females |
| (Muscles that move the scapula) LEVATOR SCAPULAE | Elevate scapula |
| (Muscles that move the scapula) RHOMBOID MAJOR AND RHOMBOID MINOR | Major helps hold scapula onto ribcage; both retract scapula |
| (Muscles that move the scapula) TRAPEZIUS | Elevates, depresses, rotates, and retracts the scapula; tilt and turn the head and neck, shrug, steady the shoulders, and twist the arms |
| (Muscles that move the scapula) SERRATUS ANTERIOR | Moves arm from side of body to front of body; assists with inhalation |
| (Muscles that move the arm) PECTORALIS MAJOR | First action is flexion of the humerus (throwing a ball underhand) Secondly it adducts the humerus (flapping arm) Thirdly it rotates the humerus medially (wrestling) Fourthly keeps the arm attached to the body. |
| (Muscles that move the arm) LATISSIMUS DORSI | rotation of the joint. Extension, adduction, medial (internal) |
| (Muscles that move the arm) DELTOID | Principal abductor or the arm. Produces flexion of the arm during walking and running motions |
| (Muscles that move the arm) TERES MAJOR | Extend arm at shoulder joint; assists in addiction and medial rotation |
| (Muscles that move the arm) SUPRASPINATUS | rotates elbow outward as in tennis swinging |
| (Muscles that move the arm) INFRASPINATUS | Rotates elbow outward |
| (Muscles that move the arm) TERES MINOR | Assists with rotating elbow outward |
| (Muscles that move the arm) SUBSCAPULARIS | Medially rotate arm; stabilizes shoulder joint |
| (Muscles that move the forearm) BICEPS BRACHII | Flexion of forearm; supination |
| (Muscles that move the forearm) BRACHIALIS | Flexion of forearm |
| (Muscles that move the forearm) BRACHIORADIALIS | Flexion of elbow; supination and pronation of forearm |
| (Muscles that move the forearm) TRICEPS BRACHII | Extension of forearm |
| (Muscles that move the wrist, hand, and fingers) FLEXOR CARPI RADIALIS | Bends wrist towards body; tilts hand laterally |
| (Muscles that move the wrist, hand, and fingers) PALMARIS LONGUS | Flexes hand at wrist |
| (Muscles that move the wrist, hand, and fingers) FLEXOR CARPI ULNARIS | Bends hand toward shoulder |
| (Muscles that move the wrist, hand, and fingers) EXTENSOR DIGITORUM | Separates fingers |
| (Muscles that move the wrist, hand, and fingers) SUPINATOR | Supination of palm (turns it anteriorly) |
| (Muscles that move the thigh, knee anterior and medial muscles) SARTORIUS | Flexes thigh at hip; flexes knee at knee joint; abduct and rotates thigh laterally (kneeling or mounting bike) |
| (Muscles that move the thigh, knee anterior and medial muscles) ADDUCTOR LONGUS | Adducts and flexes thigh; assists with raising knee |
| (Muscles that move the thigh, knee anterior and medial muscles) GRACILIS | Flexion and medial rotation around knee (as in kneeling) hip adduction |
| (Muscles that move the thigh, knee anterior and medial muscles) RECTUS FEMORIS | Extends knee and flexes hip (as when kicking) |
| (Muscles that move the thigh, knee anterior and medial muscles) VASTIS LATERALIS | Extends and stabilizes knee |
| (Muscles that move the thigh, knee anterior and medial muscles) VASTUS INTERMEDIUS | Extends and stabilizes knee |
| (Muscles that move the thigh and knee posterior muscles) GLUTEUS MAXIMUS | Major extensor of hip joint |
| (Muscles that move the thigh and knee posterior muscles) BICEPS FEMORIS | Extends thigh at hip joint; Flexes lab at knee |
| (Muscles that move the thigh and knee posterior muscles) SEMITENDINOSUS | Extends thigh; flexes knee |
| (Muscles that move the thigh and knee posterior muscles) SEMIMEMBRANOSUS | Extends thigh; flexes knee |
| (Muscles that move the feet and toes) TIBALIS ANTERIOR | Dorsiflextion; inversion |
| (Muscles that move the feet and toes) EXTENSOR HALLUCIS LONGUS | Extends big toe |
| (Muscles that move the feet and toes) FIBULARIS LONGUS | Plantar flexion; eversion |
| (Muscles that move the feet and toes) GASTROCNEMIUS | Plantar/ ankle flexion |
| (Muscles that move the feet and toes) SOLEUS | Plantar flexion |
| (Muscles that move the feet and toes) PLANTARIS | Plantar/ ankle flexion |
| (Muscles that move the feet and toes) FLEXOR DIGITORUM LONGUS | Flexes toes |
| (muscles that move the wrist, hand, and fingers) PRONATOR QUADRATUS | Pronation of palm (turns it posteriorly) |
| (Muscles that move the thigh knee; anterior and medial muscles) VASTUS MEDIALIS | Extends and stablizes knee |