뒤로Muscle Actions and Insertions in Human Anatomy
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Occipitofrontalis muscle
Action: Raises eyebrows, tenses scalp.
Insertion: Superior nuchal lines.
Orbicularis oculi muscle
Action: Closes the eyelids.
Insertion: Medial & lateral palpebral ligaments.
Orbicularis oris muscle
Action: Closes the mouth and puckers the lips.
Insertion: Circumferential skin around the lips.
Zygomaticus major muscle
Action: Draws corners of mouth superiorly.
Insertion: Angle of mouth.
Zygomaticus minor muscle
Action: Draws upper lip superolaterally.
Insertion: Medial skin of the upper lip.
Levator labii superioris muscle
Action: Draws upper lip superiorly.
Insertion: Orbicularis oris and skin of upper lip.
Depressor labii inferioris muscle
Action: Draws lower lip inferiorly.
Insertion: Orbicularis oris and skin of lower lip.
Levator anguli oris muscle
Action: Draws angle of mouth superiorly.
Insertion: Angle of mouth.
Depressor anguli oris muscle
Action: Draws angle of mouth inferiorly.
Insertion: Angle of mouth.
Temporalis muscle
Action: Elevation and retraction of mandible.
Insertion: Coronoid process of mandible.
Masseter muscle
Action: Elevation and protraction of mandible.
Insertion: Mandibular angle and lateral ramus.
Buccinator muscle
Action: Compresses cheeks against teeth.
Insertion: Fibers of orbicularis oris.
Sternocleidomastoid muscle
Action: Bilateral: flex neck; unilateral: rotate head to opposite side.
Insertion: Mastoid process and superior nuchal line.
Platysma muscle
Action: Tenses skin of neck.
Insertion: Body of mandible, skin of chin and lower lip.
Digastric muscle
Action: Depresses mandible, elevates hyoid.
Insertion: Intermediate tendon.
External intercostals
Action: Elevate ribs to increase thoracic volume during inspiration.
Internal intercostals
Action: Depress ribs to decrease thoracic volume during expiration.
Pectoralis major muscle
Action: Flexion, extension, adduction, medial rotation of humerus.
Insertion: Intertubercular sulcus of humerus.
Pectoralis minor muscle
Action: Stabilizes scapula.
Insertion: Coracoid process of scapula.
Serratus anterior muscle
Action: Protracts and stabilizes scapula.
Insertion: Medial margin of scapula.
External obliques muscle
Action: Bilateral: flex abdomen; unilateral: contralateral rotation.
Insertion: Linea alba, iliac crest, pubic tubercle.
Internal obliques muscle
Action: Bilateral: compress abdomen; unilateral: ipsilateral rotation.
Insertion: Linea alba, ribs 10–12.
Transversus abdominis muscle
Action: Compresses abdomen.
Insertion: Xiphoid process, linea alba, pubic tubercle.
Rectus abdominis muscle
Action: Flexion of abdomen.
Insertion: Costal cartilages 5–7, xiphoid process.
Trapezius muscle
Action: Rotation, retraction, elevation, depression of scapula.
Insertion: Lateral 1/3 clavicle, acromion, scapular spine.
Deltoid muscle
Action: Shoulder abduction, flexion, extension.
Insertion: Deltoid tuberosity of humerus.
Latissimus dorsi muscle
Action: Adduction, extension, medial rotation of humerus; abdominal rotation.
Insertion: Intertubercular sulcus of humerus.
Supraspinatus
Abduction of humerus
Teres major muscle
Action: Adduction and medial rotation of humerus.
Insertion: Intertubercular sulcus of humerus.
Iliocostalis:
Inserts on posterior ribs.
Infraspinatus:
Lateral rotation.
Subscapularis:
Medial rotation.
Teres minor:
Lateral rotation.
Longissimus:
Inserts on transverse processes and mastoids.
Spinalis:
Inserts on spinous processes and external occipital protuberance.