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Muscle Actions A&P
Muscles and their Actions
| Question | Answer |
|---|---|
| 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
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