Muscles Part 1

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Muscles Part 1
2013-11-04 23:07:34

Actions, origins, and insertions
Show Answers:

  1. Origin: Occipital and temporal bones
    Insertion: Skin of eyebrows and root of nose
    Action: Raises eyebrows and pulls scalp posteriorly
  2. Origin: Frontal and maxillary bones
    Insertion: Encircles orbit and inserts in tissue of eyelid
    Action: Closes eyes, blinking, squinting and draws eyebrows inferiorly
    Orbicularis oculi
  3. Origin: Zygomatic bone
    Insertion: Skin and muscle at corner of mouth
    Action: Smiling
    Zygomaticus major and minor
  4. Origin: Indirectly from maxilla and mandible
    Insertion: Encircles mouth
    Action: Closes lips; kissing and whistling muscle
    Orbicularis oris
  5. Origin: Mandible below incisors
    Insertion: Skin of chin
    Action: Protrudes lower lip, wrinkles chin
  6. Origin: Zygomatic arch and mandible
    Insertion: Ramus of mandible
    Action: Elevates mandible
  7. Origin: Temporal fossa
    Insertion: Coronoid process of mandible
    Action: Closes jaw
  8. Origin: Manubrium of sternum and medical portion of clavicle
    Insertion: Mastoid process of temporal bone and occipital bone
    Action: Flexion of neck forward; rotate head toward shoulder on opposite side
  9. Origin: Fascia of chest (over pectoral muscles) and deltoid
    Insertion: Lower margin of mandible, skin and muscle at corner of mouth
    Action: Tenses skin of neck; pulls lower lip back and down
  10. Origin: Occipital bone; spines of C7 and all thoracic vertebrae 
    Insertion: Acromion and spinous process of scapula; part of clavicle
    Action: Raises, rotates, and retracts scapula and stabilizes it. Shrugging shoulders
  11. Origin: Indirect attachment to spinous processes of lower 6 thoracic vertebrae, lumbar, last ribs and iliac crest
    Insertion: Intertubercular sulcus or humerus
    Action: Prime mover of arm extension, adducts and medially rotates arm; brings arm down in power stroke, as in striking a bow
    Latissimus dorsi
  12. Origin: Upper lateral surface of ilium
    Insertion: Greater trochanter of femur
    Action: Abducts and medially rotates thigh; steadies pelvis while walking
    Gluteus medius
  13. Origin: Dorsal ilium, sacrum, and coccyx
    Insertion: Gluteal tuberosity of femur and iliotibial tract
    Action: Powerful thigh extensor, used when climbing stairs, but NOT in walking
    Gluteus maximus
  14. Origin: By two heads from medial and lateral condyles of femur
    Insertion: Calcaneus via calcaneal tendon
    Action: Plantar flexes foot
  15. Origin: Proximal portion of tibia and fibula
    Insertion: Calcaneus via calcaneal tendon
    Action: Plantar flexion, important muscle in locomotion
  16. Origin: Ischial tuberosity, linea aspera and distal femur
    Insertion: Tendon passes laterally to insert into head of fibula and lateral condyle of tibia
    Action: Extends thigh, flexes knee; medially rotates leg
    Biceps femoris
  17. Origin: Ischial tuberosity
    Insertion: Medial aspect of upper tibial shaft
    Action: Extends thigh, flexes knee; medially rotates leg
  18. Origin: Ischial tuberosity
    Insertion: Medial condyle of tibia; lateral condyle of femur
    Action: Extends thigh, flexes knee; medially rotates leg