QUiCK QUIZ review
Masseter Muscle
Action-Elevates mandible Origin- Zygomatic arch and zygomatic bone Insertion- Mandibular angle and ramus
Nasalis muscle
Action-Flares nostrils Origin-Maxilla Insertion-Cartilage of the nose
Occipitalis Muscle
Action-Pulls scalp Origin- Occipital and temporal bones Insertion-Epicranial aponeurosis
Mentalis muscle
Action-Wrinkles the chin Origin-Mandible below incisors Insertion-Skin of chin
Temporalis muscle
Action- Closes jaw Origin- Temporal bone Insertion- Coronoid process of mandible
Orbicularis Oris Muscle
Action- Closes lips Origin-Muscle fibers of other muscles associated with the lips Insertion- Muscle and skin at angles of the mouth
Rectus abdominus muscle
Action- Compress abdomen Origin- Pubis crest Insertion- Xiphoid process
External oblique muscle
Action- Compresses abdomen Origin- Anterior surface of ribs 5-12 Insertion- Iliac crest
Internal oblique muscle
Action- Compresses abdomen Origin- Iliac crest Insertion- Linea alba
Transversus abdominus muscle
Action- Compresses abdomen Origin- Iliac crest Insertion- Linea alba
Levator ani muscle
Action- Constricts lower rectum (and vagina in females) Origin- body of pubis Insertion- Pubic crest
Sternohyoid muscle
Action- Depresses larynx Origin- Manubrium medial end of clavicle Insertion- Lower margin of hyoid bone
Internal intercostal mm
Action- Draws ribs together to depress rib cage Origin- Superior border of rib below Insertion- Inferior border of rib above
Pectoralis minor muscle
Action- Draws scapula forward Origin- Anterior surface of ribs 3-5 Insertion- Coracoid process of scapula
Mylohyoid Muscle
Action- Elevates hyoid bone Origin- Medial surface of mandible Insertion- Hyoid bone
Scalene MM
Action- Elevates ribs 1-2, Flex/ rotate neck Origin- Spinous processes of cervical vertebrae Insertion- Anterolaterally on ribs 1-2
Levator scapulae muscle
Action- Elevates, adducts scapula Origin- Transverse process of C1-C4 Insertion- Medial border of scapula
Erector Spinae mm
Action- Extend and bend the vertebral column laterally Origin- Lliac crest, transverse processes of CTL vertebrae Insertion- Ribs, Transverse process of CTL vertebrae (6 segments above origin)
Semispinalis Capitus muscle
Action- Extend neck and vertebral column (Bilateral), Rotation toward opposite side (Unilateral ) Origin- Transverse process of C7-T12 Insertion- Occipital bone, spinous processes of C1-T4
Semispinalis Thoracis Muscle
Action- Extend neck and vertebral column (Bilateral), Rotation toward opposite side (Unilateral) Origin- Transverse process of C7-T12 Insertion- Occipital bone, spinous process of C1-T4
Trapezius muscle
Action- Extends neck Origin- Occipital bone Insertion- Lateral 1/3 of clavicle
Teres major muscle
Action- Extends/medially/ rotates/ adducts arm Origin- Inferior angle of scapula Insertion- Intertubercular sulcus of humerus
Sternocleidomastoid muscle
Action- Flection of the neck (bilateral), rotate head towards shoulders on opposite side (unilateral) Origin- Manubrium of sternum Insertion- Mastoid process of temporal bone, Superior nuchal line of occipital bone
Digastric Muscle
Action- Open mouth Origin- Lower margin of mandible Insertion- Hyoid bone
Latissimus dorsi muscle
Action- Prime mover of arm extension Origin- lliac crest Insertion- Intertubercular sulcus of humerus
Pectoralis major muscle
Action- Prime mover of arm flexion Origin- Clavicle Insertion- Intertubercular sulcus of humerus
Diaphragm muscle
Action- Prime mover of inspiration Origin- Inferior border of sternum Insertion- Central tendon
Deltoid muscle
Action- Prime mover or arm abduction Origin- Lateral 1/3 of clavicle Insertion- Deltoid tuberosity of humerus
Serratus anterior muscle
Action- Prime mover to protract scapula Origin- Lateral aspect of ribs 1-8 Insertion- Medial border of scapula
External intercostal muscle
Action- Pulls ribs toward one another to elevate rib cage Origin- Inferior border of rib above Insertion- Superior border of rib below
Frontalis Muscle
Action- Raises eyebrows Origin-Epircranial aponeurosis Insertion-skin of eyebrows
Rhomboid major muscle
Action- Retract scapula Origin- Spinous processes of C7-T5 Insertion- Medial border of scapula
Rhomboid minor muscle
Action- Retract scapula Origin- Spinous processes of C7-T5 Insertion- Medial border of scapula
Teres minor muscle
Action- Stabilizes shoulder Origin- Lateral border of scapula Insertion- Greater tubercule of humerus
Subscapularis muscle
Action- Stabilizes shoulder Origin- Subscapular fossa of scapula Insertion- lesser tubercule of humerus
infraspinatus muscle
Action- Stabilizes shoulder Origin- infraspinous fossa of scapula Insertion- Greater tubercule of humerus
Supraspinatus muscle
Action- stabilizes the shoulder Origin- Supraspinous fossa of scapula Insertion- Greater tubercule of humerus
Orbicularis oculi muscle
Action-Closes eyes Origin-Frontal and maxillary bones Insertion-Tissue of eyelids
Buccinator Muscle
Action-Compresses cheek Origin-Molar region of maxilla Insertion-Orbicularis oris muscle
