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Muscle Actions A&P

Muscles and their Actions

QuestionAnswer
Fibularis Eversion of foot and plantar flexion at ankle
Gastrocnemius Plantar flexion at ankle and flexion at knee
Tibialis Anterior Dorsiflexion at ankle and inversion of foot
Vastus lateralis, Vastus Medialis and Vastus Intermedius Extension at knee (Quadriceps)
Rectus Femoris Extension at knee and flexion of hip (Quadriceps)
Sartorius Flexion at knee, flexion and lateral rotation at hip
Semitendinosus Flexion at knee, extension and medial rotation at hip (hamstring)
Semimembranosus Flexion at knee, extension and medial rotation at hip (hamstring)
Biceps Femoris Flexion at knee, extension and lateral rotation at hip (hamstring)
Ilicus and Psoas Major Flexion at hip and/or lumbar intervertebral joints
Gracilis Flexion at knee, adduction and medial rotation at hip
Pectineus Adduction, flexion and medial rotation at hip joint
Adductor Longus Adduction, flexion and medial rotation at hip
Tensor Fasciae Latae Flexion, abduction, and medial rotation at hip
Gluteus Medius Abduction and medial rotation at hip
Gluteus Maximus Extension and lateral rotation at hip
Triceps Brachii Extension at elbow
Brachioradialis Flexion at elbow
Brachialis Flexion at elbow
Biceps Brachii Flexion at shoulder and elbow
Lumbodorsal Fascia Fascia at lower back-next to latissimus dorsi
Teres Major Adduction and medial rotation at shoulder (rotator cuff muscle)
Infraspinatus Laterl rotation at shoulder (rotator cuff)
Teres Minor Lateral rotation at shoulder (rotator cuff)
Pectoralis Major Flexion, adduction and medial rotation of shoulder
Latissimus Dorsi Extension, adduction and medial rotation of shoulder
Deltoid Abduction at shoulder
Trapezius Elevate, Adduct, Depress or rotate scapula and/or elevate clavicle
Serratus Anterior Protracts shoulder, abducts and medially rotates scapula
Rhomboid Adducts and rotates scapula downward
Levator Ani Tenses floor of pelvis, elevates and retracts anus
Rectus Abdominis Depresses ribs, flexes vertebral column
Internal and External obliques Compresses abdomen and depresses ribes
Diaphragm Contraction expends thoracic cavity, compresses abdominopelvic cavity
Internal Intercostals Depress ribs
External Intercostals Elevate ribs
Erector Spinae muscles 3 different ones-extend vertebral column
Pharyngeal Constrictors Constrict throat when swallowing
Sternocleidomastoid Both sides together flex neck. One side alone bends head toward shoulder and turns face to opposite side
Stylohyoid Elevates larynx
Sternohyoid Depresses hyoid bone and larynx
Platysma Tenses skin of neck, depresses mandible
Genioglossus Protrudes tongue
Temporalis Elevates mandible
Masseter Elevates mandible
Occipitalis Tenses and retracts scalp
Frontalis Raises eyebrows, wrinkles forehead
Orbicularis Oculi Closes eye
Zygomaticus Draws corner of mouth back and up
Depressor Anguli Oris Depresses corner of mouth
Orbicularis Oris Compresses and purses lips
Buccinator Compresses cheeks
Galea Aponeurotica Sheet of tendon at the top of the head
Soleus Plantar flexion at ankle, adduction of foot
Created by: willowguns