Origin, Insertion, Action

What is the occipitalis muscle?\n\n

Origin: Occipital bone, epicranial aponeurosis; Action: Raises eyebrows.

What is the frontalis muscle?\n\n

Origin: Epicranial aponeurosis, fascia; Action: Raises eyebrows.

What is the temporalis muscle?\n\n

Origin: Temporal fossa; Insertion: Mandible; Action: Elevates mandible.

What is the masseter muscle?\n\n

Origin: Zygomatic process of maxilla; Insertion: Mandible; Action: Elevates mandible.

What is the orbicularis oculi muscle?\n\n

Origin: Maxilla; Insertion: Eyelid; Action: Closes eyelid.

What is the orbicularis oris muscle?\n\n

Origin: Maxilla; Insertion: Angle of mouth; Action: Closes lips.

What is the sternocleidomastoid muscle?\n\n

Origin: Sternum; Insertion: Temporal bone; Action: Flexes neck.

What is the platysma muscle?\n\n

Origin: Fascia of chest; Insertion: Fascia of chin; Action: Depresses mandible.

What is the pectoralis major muscle?\n\n

Origin: Sternum; Insertion: Humerus; Action: Flexion of the arm.

What is the external intercostal muscle?\n\n

Origin: Lower margin of ribs; Insertion: Superior border of inferior rib; Action: Elevates rib cage.

What is the internal intercostal muscle?\n\n

Origin: Upper margin of ribs; Insertion: Inferior border of superior rib; Action: Depresses rib cage.

What is the external oblique muscle?\n\n

Origin: Ribs 5-12; Insertion: Iliac crest; Action: Stabilizes abdomen.

What is the internal oblique muscle?\n\n

Origin: Ilium; Insertion: Linea alba; Action: Stabilizes abdomen.

What is the transversus abdominis muscle?\n\n

Origin: Ilium; Insertion: Linea alba; Action: Compresses abdomen.

What is the rectus abdominis muscle?\n\n

Origin: Pubis; Insertion: Xiphoid process; Action: Compresses abdomen.

What is the trapezius muscle?\n\n

Origin: Occipital bone; Insertion: Scapula; Action: Rotates scapula.

What is the latissimus dorsi muscle?\n\n

Origin: Iliac crest; Insertion: Humerus; Action: Extends arm.