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Muscles of the Spinal Column Chapter 12. Cervical Muscles.

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Presentation on theme: "Muscles of the Spinal Column Chapter 12. Cervical Muscles."— Presentation transcript:

1 Muscles of the Spinal Column Chapter 12

2 Cervical Muscles

3 Splenius (capitis and cervicis) Origin:  Cervicis – spinous process of T3-T6  Capitis - lower half of ligmentum nuchea & spinous process of C7 and T1-3. Insertion:  Cervicis - transverse process of C1-C3.  Capitis – mastoid process and occipital bone Actions: Whole  Cervical Extension Half  Cervical Rotation to the same side.  Cervical Lateral flexion

4 Splenius (cervicis & capitis)

5 Splenius

6 Sternocleidomastoid O: Top of the sternum and medial third of the clavical I: Mastoid process Action: Whole  Cervical Flexion Half  Cervical Lateral Flexion  Cervical Rotation to the opposite side.

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8 Sternocleidomastoid

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10 Scalenes (or scaleni) O: First two ribs I: Transverse processes of cervical vertebrae. Actions:  Whole – Cervical Flexion  Half - Cervical Lateral Flexion (help with inhalation during exercise)

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12 Scalenes

13 Lumbar Muscles

14 Erector spinae muscles O: Fascia of lower back, posterior L, T and lower C vertebrea, and angles of ribs. Inesrtions  Spinalis branch - spinous process of T and C and occipital bone  Longissimus branch - transverse process of T and C, mastoid process.  Iliocostalis branch - angles of the ribs and cervical transverse processes Actions:  Whole – Extension  Half - Lateral flexion

15 Erector spinae muscles

16 Iliocostalis branch Longissimus branch Spinalis branch

17 Spinalis branch Longissimus branch Iliocostalis branch

18 Quadratus lumborum O: Posterior lip of iliac crest I: Lower border of 12th rib and transverse process of L1-4 Actions:  Half - Lumbar lateral flexion  Whole - Stabilization

19 Quadratus lumborum

20 Iliopsoas O:  Psoas - lateral surface of T12 and L1-5,  Iliacus - anterior surface of ilium (iliac fossa) I: Lesser trochanter of femur Action:  Whole - Lumbar f lexion of trunk  [Whole - Hip flexion]

21 Iliopsoas

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23 The Abdominal Muscles 1. 2. 3. 4.

24 Rectus abdominis O: Crest of the pubis I: Xyphoid process and 5th - 7th ribs Action: Whole  Lumbar Flexion Half  Lumbar lateral flexion

25 Rectus abdominis

26 External oblique O: Lower 8 ribs. I: Anterior iliac crest; inguinal ligament, crest of pubis, fascia of the rectus abdominus Action:  Whole – Lumbar flexion  Half Lumbar rotation to opposite side Lumbar lateral flexion

27 External oblique

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29 Internal oblique O: Inguinal ligament (from anterior iliac crest to pubis) and iliac crest I: Costal cartilages of the lower ribs. Actions:  Whole – Lumbar flexion  Half Lumbar rotation to the same side Lumbar lateral flexion

30 Internal oblique

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32 Internal External The Oblique Muscles? Which is Internal and which is External?

33 Transverse abdominis I: Inguinal ligament, iliac crest, and lower 6 ribs O: Linea alba ("white line") and pubis crest Functions:  Exhalation (during exercise)

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35 Transverse abdominis

36 MUSCLES OF RESPIRATION Rib actions Respiration

37 III. ANATOMY of the RESPIRATOY MUSCLES

38 Diaphragm O: Xiphoid process, costal cartilages, lumbar vertebrae I: Central tendon A: Flattens, pulls central tendon downward

39 External Intercostals O: Inferior border of the ribs I: Superior border of the next rib below A: Draws ribs together and lifts the ribs 11 on each side; slant down and forward

40 Internal Intercostals (p. 379) O: Inferior border of the ribs I: Superior border of the next rib down A: Draws ribs together and lowers ribs slant down and backward

41 MUSCLES OF RESPIRATION Diaphragm Rib (with Intercostal Muscles) Inspiration Expiration

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43 I. INSPRIATION Increase in thorasic cage Volume inside increases Pressure decreases Air moves into the lungs

44 A. Inspiration at Rest 1. Diaphragm  Flattens and moves downward when contracted

45 A. Inspiration at Rest 1. Diaphragm  Flattens and moves downward when contracted 2. External Intercostals Lift the ribs up and out when contracted

46 B. Inspiration During Exercise 1. Scalenes – elevate upper ribs 2. Sternoceidomastoid – elevate clavical and upper ribs 3. External intercostal muscles

47 II. EXPIRATION Decrease thorasic cage Volume inside decreases Pressure increases Air moves out of the lungs

48 A. Expiration at Rest. No muscles are involved Passive recoil action at rest will decrease the thorasic cage

49 B. Expiration During Exercise Internal Intercostals - Rectus Abdominus – help push the diaphragm upward. External obliques– help push the diaphragm upward. Internal obliques– help push the diaphragm upward. Transverse abdominus– help push the diaphragm upward.

50 Muscles of Inspiration Muslces of Expiration *Sternocleidomastoid *Scalenes *Rectus Abdominus *Transverse Abdominus *External Obliques *Internal Obliques External Intercostals *Internal Intercostals Diaphragm

51 Note: These muscles need to trained with exercise as any other muscle does. Early limitations (side aches and breathlessness) felt during exercise may involve the untrained state of these muscles.


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