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11 muscles


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11 muscles

  1. 1. Chapter 11 Muscles Muscles of facial expression Muscles of mastication Extrinsic tongue muscles Muscles of the neck and throat Back muscles Deep thorax muscles Abdominal wall muscles Superficial thorax muscles Shoulder muscles Elbow muscles Forearm muscles Hip & knee muscles Leg muscles
  2. 2. Chapter 11 Muscles You are responsible for muscles described in class – Origin – Insertion – Action – Nerve - innervation (if given) Be able to recognize muscles in all diagrams of text
  3. 3. Muscles of facial expression Orbicularis oculi – Sphincter muscle of eyelid – O: frontal & maxillary bones – I: tissue of eyelid – Action: closes eye – Nerve: facial / CN VII (11.6)
  4. 4. Muscles of facial expression Zygomaticus Majo r an d Mi nor – O: zygomatic bone – I: corners of mouth – Action: smiling – Nerve: facial / CN VII (11.6)
  5. 5. Muscles of mastication Masseter – O: zygomatic arch – I: angle & ramus of mandible – Action: elevate mandible – Nerve: trigeminal nerve / CN V (foramen ovale) Masseter (11.7a)
  6. 6. Muscles of mastication Temporalis – O: temporal fossa – I: coronoid process of mandible – Action: elevate and retract mandible – Nerve: trigeminal n. / CN V (11.7a)
  7. 7. Extrinsic tongue muscles Styloglossus – O: styloid process of temporal bone – I: tongue – Action: retract & elevate tongue – Nerve: hypoglossal n. / CN XII Styloglossus (11.7c)
  8. 8. Extrinsic tongue muscles Hyoglossus – O: hyoid bone – I: tongue – Action: depresses tongue – Nerve: hypoglossal n. / CN XII Hyoid bone (11.7c)
  9. 9. Muscles of neck & throat Digastric – two muscle bellies with an intermediate tendon attached to the hyoid bone – O: inferior margin of mandible (anterior belly); mastoid process of temporal bone (posterior belly) – I: hyoid bone – Action: elevate hyoid, stabilize Posterior belly Anterior belly hyoid, depress mandible (11.8a) – Nerve: trigeminal n. / CN V (anterior belly), facial n. / CN VII (posterior belly)
  10. 10. Muscles of neck & throat Stylohyoid – O: styloid process of temporal bone – I: hyoid bone – Action: elevate & retract hyoid, swallow – Nerve: facial n. / CN VII Stylohyoid (11.7c)
  11. 11. Muscles of neck & throat Sternohyoid – O: manubrium & medial end of clavicle – I: hyoid bone – Action: depress hyoid Sternohyoid (11.8a)
  12. 12. Muscles of neck & throat Pharyngeal constrictors – O: mandible, pterygoid process, hyoid, laryngeal cartilages Superior – I: posterior medial raphe of pharynx Middle – Action: peristaltic contraction / swallow Inferior (11.8b)
  13. 13. Muscles of neck & throat Sternocleidomastoid – O: manubrium & medial clavicle – I: mastoid process of temporal bone – Action: head & neck flexion, rotate head contralaterally – Nerve: accessory n. / CN XI (11.8a)
  14. 14. Muscles of neck & throat Sternocleidomastoid
  15. 15. Back muscles Spinalis – O: spines of upper lumbar and lower thoracic vertebrae – I: spines of upper thoracic and cervical vertebrae – Action: extends vertebral column (11.9d)
  16. 16. Deep thorax muscles External & internal intercostals – O&I: inferior & superior border of ribs – Action: inspiration and expiration Internal (11.10a)
  17. 17. Deep thorax muscles Xiphoid process Diaphragm – O: inferior internal surface of rib cage & sternum, inferior costal cartilages, lumbar vertebrae – I: central tendon – Action: flattens on contraction (inspiration) – Nerve: phrenic nerves (11.10b)
  18. 18. Abdominal wallmuscles Rectus abdominis – O: pubic crest & symphysis – I: xiphoid process and costal cartilages of ribs 5-7 – Action: flex & rotate lumbar vertebrae, fix & depress ribs, stabilize pelvis during walking, increase intraabdominal pressure – Note: 3 tendinous insertions, aponeurosis & (11.11ab) linea alba
  19. 19. Superficial thorax muscles Pectoralis minor – O: anterior surface of ribs 3-5 – I: coracoid process of scapula – Action: with ribs fixed, pulls scapula anterior & inferior; with scapula fixed, pulls ribs superiorly – Nerve: Medial and lateral pectoral nerves (11.13a) (C6-C8)
  20. 20. Superficial thorax muscles
  21. 21. Superificialthorax muscles Serratus anterior – O: ribs 1-8 – I: vertebral border of scapula – Action: hold scapula against chest wall, moves inferior angle of scapula lateral & superior (abduction, pushing, punching) – Nerve: long thoracic nerve (11.13a,8.1a reversed)
  22. 22. Superificial thoraxmuscles Trapezius – O: occipital bone, ligamentum nuchae, C7- T12 spinous processes – I: acromion, spine of scapula, lateral third of clavicle – Action: stabilize, elevate, adduct, depress scapula, extend head – Nerve: Accessory (11.13b) (CNXI), C3 and C4
  23. 23. Shoulder muscles Pectoralis major – O: medial clavicle, sternum, cartilage of ribs 1-6, aponeurosis of external oblique – I: greater tubercle of humerus – Action: arm-flexion, (11.13a) medial rotation, adduction, elevation -Nerve: Medial and lateral of rib cage pectoral nerves (C6-C8)
  24. 24. Shoulder muscles Deltoid – O: lateral clavicle, acromion & spine of scapula (compare to insertion of trapezius) – I: deltoid tuberosity of humerus – Action: arm-abduction, flexion, extension, medial & lateral rotation – Nerve: Axillary nerve(C5- C-6) (11.13ab)
  25. 25. Shoulder muscles Subscapularis – O: subscapular fossa – I: lesser tubercle of humerus – Action: medial rotate arm, stabilize shoulder joint (11.14d) – Nerve: Subscapular nerves (C5-C7)
  26. 26. Shoulder muscles Infraspinatus – O: infraspinous fossa – I: greater tubercle of humerus – Action: lateral rotate humerus, stabilized shoulder joint – Nerve: Suprascapular nerve (11.14b)
  27. 27. Rotator cuff muscles Act to stabilize head of humerus in glenoid cavity and prevent dislocation Supraspinatous (Suprascapular nerve) Infraspinatus (Suprascapular nerve) Subscapularis (Subscapular nerve) Teres minor (Axillary nerve)
  28. 28. Elbow muscles Triceps brachii – O: long head- infraglenoid tubercle, lat. & med. heads-posterior shaft of humerus – I: olecranon process of ulna – Action: extend forearm, assist adduction of arm – Nerve: Radial nerve (11.14b)
  29. 29. Elbow muscles Biceps brachii – O: short head-coracoid process, long head-tubercle above glenoid cavity and lip of glenoid cavity (intertubercular groove) – I: radial tuberosity – Action: flex elbow, supinate forearm, weak arm flexor – Nerve: Musculocutaneous nerve (C5 & C6) (11.14c)
  30. 30. Forearm muscles Flexor carpi (radialis radialis & ulnaris) ulnaris – O: medial epicondyle of humerus, ulna – I: metacarpals and carpals – Action: wrist flexion, abduct & adduct hand – Carpal tunnel (Median nerve) syndrome p. (11.15a) 184 Anterior view
  31. 31. Forearm muscles Extensor carpi – O: lateral epicondyle of humerus – I: base of metacarpals – Action: extend, abduct, and adducts wrist – Palpate forearm muscles
  32. 32. Hip & knee muscles Quadriceps femoris – O: anterior inferior iliac spine, superior margin of acetabulum, greater trochanter, shaft of femur – I: patella and tibial tuberosity via patellar tendon – Action: extend knee, flex thigh
  33. 33. Hip & knee muscles Gluteus muscles – O: ilium, sacrum, coccyx – I: shaft & greater trochanter of femur – Action: extend thigh (climb stairs, running), lateral & medial rotate thigh, abduct thigh, steadies pelvis
  34. 34. Hip & knee muscles Hamstrings – O: ischial tuberosity, shaft of femur – I: lateral & medial condyles and shaft of tibia, head of fibula, lateral condyle femur – Action: extend thigh, flex knee – Makes touching toes hard
  35. 35. Leg muscles  Tibialis anterior – O: lateral condyle and shaft of tibia – I: tarsal and first metatarsal bones – Action: dorsiflexion
  36. 36. Leg muscles Gastrocnemius – O: medial & lateral condyles of femur – I: calcaneus via Achilles tendon – Action: plantar flexion, flex knee