Muscles Quiz Flashcards
Epicranius (origin)
Occipital bone
Epicranius (insertion)
Skin around eye
Epicranius (action)
Elevates eyebrow as when surprised
Epicranius (nerve supply)
Facial nerve
Orbicularis oculi (origin)
Maxillary and frontal bones
Orbicularis oculi (insertion)
Skin around eye
Orbicularis oculi (action)
Closes eye as in blinking
Orbicularis oculi (nerve supply)
Facial nerve
Orbicularis oris (origin)
Muscles near the mouth
Orbicularis oris (insertion)
Skin of central lip
Orbicularis oris (action)
Closes lips, protrudes lips as for kissing
Orbicularis oris (nerve supply)
Facial nerve
Buccinator (origin)
Alveolar processes of maxilla and mandible
Buccinator (insertion)
Orbicularis oris
Buccinator (action)
Compresses cheeks
Buccinator (nerve supply)
Facial nerve
Zygomaticus major and minor (origin)
Zygomatic bone
Zygomaticus major and minor (insertion)
Skin and muscle at corner of mouth
Zygomaticus major and minor (action)
Elevates corner of mouth as when smiling
Zygomaticus major and minor (nerve supply)
Facial nerve
Platysma (origin)
Fascia in upper chest
Platysma (insertion)
Skin and muscles below mouth
Mandible
Platysma (action)
Depresses lower lip and angle of mouth as when pouting
Platysma (nerve supply)
Facial nerve
Masseter (origin)
Zygomatic arch
Masseter (insertion)
Lateral surface of ramus of mandible
Masseter (action)
Elevates and protracts mandible
Masseter (nerve supply)
Trigeminal nerve
Temporalis (origin)
Temporal bone
Temporalis (insertion)
Coronoid process and anterior ramus of mandible
Temporalis (action)
Elevates and retracts mandible
Temporalis (nerve supply)
Trigeminal nerve
Sternocleidomastoid (origin)
Anterior surface of sternum and upper surface of clavicle
Sternocleidomastoid (insertion)
Mastoid process of temporal bone
Sternocleidomastoid (action)
Each laterally flexes neck to the same side, rotates head to the opposite side. Together they flex neck forward
Also aid in forceful inhalation.
Splenius capitis (origin)
Ligamentum nuchae and spinous processes of seventh cervical and upper thoracic vertebrae.
Splenius capitis (insertion)
Occipital bone
Splenius capitis (action)
Rotates head, laterally flexes and extends neck
Teres major (origin)
Lateral border of scapula
Teres major (insertion)
Intertubercular sulcus of humerous
Teres major (action)
Extends shoulder, adducts, and rotates arm medially
Teres minor (origin)
Lateral border of scapula
Teres minor (insertion)
Greater tubercle of humerous
Teres minor (action)
Rotates arm laterally
Pectoralis major (origin)
Clavicle, sternum, and costal cartilages of upper ribs
Pectoralis major (insertion)
Intertubercular sulcus of humerus
Pectoralis major (action)
Flexes shoulder, adducts, and rotates arm medially
Supraspinatus (origin)
Supraspinous fossa of scapula
Supraspinatus (insertion)
Greater tubercle of humerus
Supraspinatus (action)
Rotates arm medially
Infraspinatus (origin)
Infraspinous fossa of scapula
Infraspinatus (insertion)
Greater tubercle of humerus
Infraspinatus (action)
Rotates arm laterally
Deltoid (origin)
Acromion process, spine of the scapula, and the clavicle
Deltoid (insertion)
Deltoid tuberosity of humerus
Deltoid (action)
Lateral portion abducts arm
Anterior portion flexes shoulder
Posterior portion extends shoulder
Latissimus dorsi (origin)
Spines of sacral, lumbar, and lower thoracic veretbrae, illiac crest, and lower ribs
Latissimus dorsi (insertion)
Intertubercular sulcus of humerus
Latissimus dorsi (action)
Extends shoulder, adducts, and rotates arm medially, or depresses and retracts shoulder