Lab 12

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Author:
143tennis
ID:
247999
Filename:
Lab 12
Updated:
2013-11-20 00:31:28
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Muscles Anterior Body
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Description:
Muscles of the Anterior Body
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  1. Masseter
    • Origin: Zygomatic arch
    • Insertion: Lateral surface of mandibular ramus
    • Action: Elevates mandible and closes the jaws
  2. Temporalis
    • Origin: Along the temporal lines of skull
    • Insertion: Coronoid process of mandible
    • Action: Elevates mandible
  3. Sternocleidomastoid
    • Origin: Two bellies: clavicular head attaches to sternal end of clavicle; sternal head attaches to manubrium
    • Insertion: Mastoid region of the skull and lateral portion of superior nuchal line
    • Action: Together, they flex the neck; alone, one side bends head toward shoulder and turns face to opposite side
  4. Pectoralis major
    • Origin: Cartilages of ribs 2-6, body of sternum, and inferior, medial portion of clavicle
    • Insertion: Crest of greater tubercle and lateral lip of intertubercular groove of humerus
    • Action: Flexion, adduction, and medial rotation at shoulder
  5. Biceps brachii
    • Origin: Short head from the coracoid process; long head of the supraglenoid tubercle (both on the scapula)
    • Insertion: Tuberosity of radius
    • Action: Flexion at elbow and shoulder; supination
  6. Flexor carpi radialis
    • Origin: Medial epicondyle of humerus
    • Insertion: Bases of second and third metacarpal bones
    • Action: Flexion and abduction at wrist
  7. Flexor carpi ulnaris
    • Origin: Medial epicondyle of humerus; adjacent medial surface of olecranon and anteromedial portion of the ulna
    • Insertion: Pisiform, hamate, and base of fifth metacarpal bone
    • Action: Flexion and adduction at wrist
  8. Rectus abdominus
    • Origin: Superior surface of pubis around symphysis
    • Insertion: Inferior surfaces of costal cartilages (ribs 5-7) and xiphoid process
    • Action: Depresses ribs, flexes vertebral column, compresses abdomen
  9. Adductor longus
    • Origin: Inferior ramus of pubis anterior to adductor brevis
    • Insertion: Linea aspera of femur
    • Action: Adduction, flexion, and medial rotation at hip
  10. Rectus femoris
    • Origin: Anterior inferior iliac spine and superior acetabular rim of ilium
    • Insertion: Tibial tuberosity via patellar ligament
    • Action: Extension at knee; flexion at hip
  11. Vastus lateralis
    • Origin: Anterior and inferior to greater trochanter of femur and along linea aspera (proximal half)
    • Insertion: Tibial tuberosity via patellar ligament
    • Action: Extension at knee
  12. Vastus intermedius
    • Origin: Anterolateral surface of femur and linea aspera (distal half)
    • Insertion: Tibial tuberosity via patellar ligament
    • Action: Extension at knee
  13. Vastus medialis
    • Origin: Entire length of linea aspera of femur
    • Insertion: Tibial tuberosity via patellar ligament
    • Action: Extension at knee
  14. Tibialis anterior
    • Origin: Lateral condyle and proximal shaft of tibia
    • Insertion: Base of first metatarsal bone and medial cuneiform bone
    • Action: Flexion (dorsiflexion) at ankle; inversion of foot
  15. Extensor hallucis longus
    • Origin: Anterior surface of fibula
    • Insertion: Superior surface, distal phalanx of great toe
    • Action: Extension at joints of great toe
  16. Extensor digitorum longus
    • Origin: Lateral condyle of tibia, anterior surface of fibula
    • Insertion: Superior surfaces of phalanges, toes 2-5
    • Action: Extension at joints of toes 2-5

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