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Muscle Actions
A&P 2 Lab Exam 2
| Question | Answer |
|---|---|
| Occipitofrontalis | Raises eyebrows (surprised expression) |
| Orbicularis Oculi | Closes eyes |
| Orbicularis Oris | Closes lips; kissing + speech |
| Masseter | Elevates mandible; (chewing) |
| Temporalis | Elevates + retracts mandible |
| Sternocleidomastoid | Rotate head + flex cervical vertebrae |
| Platysma | Depresses mandible (pouting) |
| Rectus Abdominis | Compress abdomen + flex vertebral column |
| External Oblique | Rotate to opposite side |
| Internal Oblique | Rotate to same side |
| Transverse Abdominis | Compress abdomen |
| Pectoralis minor | Abducts scapula + rotates it downward |
| Serratus Anterior | Abducts scapula + rotates it upward (boxer’s muscle) |
| Trapezius | Elevates the shoulder joint + adducts (retracts) the scapula |
| Levator Scapulae | Elevates scapula |
| Rhomboid Major | Adducts + elevates + stabilizes scapula |
| Rhomboid Minor | Adducts + elevates + stabilizes scapula |
| Pectoralis Major | Adducts + medially rotates arm at shoulder joint |
| Latissimus Dorsi | Draws arm inferiorly + posteriorly |
| Deltoid | Shoulder abduction, flexion, extension |
| Supraspinatus | Shoulder abduction |
| Infraspinatus | Laterally rotates arm at shoulder joint |
| Teres Major | Extends, adducts, + medially rotates arm at shoulder joint |
| Teres Minor | Rotates the shoulder joint laterally (externally) |
| Biceps Brachii | Flexes the elbow |
| Coracobrachialis | Flexes + adducts arm at shoulder joint |
| Brachialis | Flexes the elbow |
| Brachioradialis | Flexes the elbow + helps to return hand to neutral position after supination or pronation |
| Triceps Brachii | Extends the elbow |
| Pronator Teres | Proximal pronator |
| Supinator | Turns palm anteriorly (used when tightening with a screwdriver (R)) |
| Flexor Carpi Radialis | Flexes hand at wrist joint |
| Flexor Carpi Ulnaris | Flexes hand at wrist joint |
| Extensor Digitorum | Extends phalanges |
| Gluteus Maximus | Extends thigh at hip joint + laterally rotate thigh |
| Gluteus Medius | Abducts the hip |
| Iliacus | Flex thigh at hip joint + laterally rotate thigh |
| Psoas Major | Flex thigh at hip joint + laterally rotate thigh |
| Sartorius | Flexes + abducts + laterally rotates the hip (hacky sack muscle) |
| Rectus Femoris | Extends the knee + flexes the hip joint (soccer kicking muscle) |
| Vastus Lateralis | Extend the knee |
| Vastus Medialis | Extend the knee |
| Vastus Intermedius | Extend the knee |
| Biceps Femoris | Flexes the knee + extends the hip |
| Semitendinosus | Flexes the knee + extends the hip |
| Semimembranosus | Flexes the knee + extends the hip |
| Gracilis | Adducts thigh at hip joint |
| Adductor Longus | Adducts thigh at hip joint |
| Adductor Brevis | Adducts thigh at hip joint |
| Adductor Magnus | Adducts thigh at hip joint |
| Pectineus | Adducts thigh at hip joint |
| Tibialis Anterior | Dorsiflexion of the ankle + inversion of the foot |
| Gastrocnemius | Plantar flexes foot at ankle joint |
| Soleus | Plantar flexes foot at ankle joint |
| Fibularis Longus | Plantar flexes + everts foot |
Created by:
JoshuaB5