Explains thoracolumbar muscles

1. B Y
H O S S E I N K H O R R A M I P h D D O M P
THORACOLUMBAR
MUSCLES
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2. Vertebral bones
• Cervical, 7
• Thoracic, 12
• Lumbar, 5
• Sacral, 5 fused
• Coccygeal, 4 fused

3. • Four facet joints on
each vertebrae

4. TRAPEZIUS MUSCLE
• Origin
• Occipital bone
• Spinous process of C7-
T12
• Insertion
• Lateral clavicle
• Acromion
• Spine of scapula
• Innervation
C3-C4 & XI( accessory nerve)
https://www.youtube.com/watch?v=P5sOhwBZon8

5. Trapezius, functions
• Elevation of scapula
• Retraction(adduct) scapula
• Upwardly rotate scapula
• Depress scapula
• Neck extension
https://www.youtube.com/watch?v=P5sOhwBZon8

6. Latissimus Dorsi

7. LATISSIMUS DORSI
• Origin
• T7-T12(T6-T12)
• 9th -12th ribs
• Thoracolumbar fascia
• Iliac crest
• Crest of sacrum
• Insertion
• Intertubecular sulcus of humerus
• Function
• Adduct
• Arm extension
• Internal rotation of arm at the shoulder

8. BICIPITAL GROOVE
• Biceps brachii
• Latissimus dorsi
• Pectoralis major
• Teres major

9. LATISSIMUS DORSI

10. • Origin
• Transverse process of C1-C4
• Insertion
• Medial border of scapula
• Innervation
• C3-C4
• Function
• Cervical Spine: Extension, lateral flexion and ipsilateral rotation
• Scapula: Elevation and downward
rotation
Levator Scapulae

12. Rhomboid Muscle
• Origin
• Spinous process C7-T1(minor)& T2-T5(major)
• Insertion
• Medial border of scapula
• Scapular retraction
• Elevation

13. Splenius Capitis
• Origin:
• C3-T3
• Insertion:
• Occipital bone
• Mastoid process
• Function
• Head & neck extension
• Lat flexion
Same side head rotation
https://www.youtube.com/watch?v=unDACOZpBpI

14. Splenius Cervicis
• Origin:
• Spinous process of T3-T6
• Insertion:
• Transvers process of C1-C3
• Function
• Head & neck extension
& hyperextension
• Lat flexion
Same side head rotation

15. Semispinalis Capitis
• Origin
• Articular process of C4-C6
• Transverse process of C7-T6
• Insertion
• Occepital bone
• Function
• Ext & hyperext of the head and
neck
• Head & neck rotation to the
opposite side

17. Semispinalis Cervicis
• Origin
• Transverse process of T1-T6
• Insertion
• Spinous process C2-C5
• Function
• Ext of the head and neck
• Head & neck rotation to the
opposite side
• Laterally flex neck

18. THORACIC INTERMEDIATE MUSCLES
• Spinalis
• Semispinalis
• Longissimus
• Iliocostalis

21. THORACOLUMBAR MUSCLES
• Superficial
• Latissimus dorsi
• Serratus posterior
• Internal oblique
• External oblique
• Quadratus lumbarum
• Intermediate
• Erector spinae
• Iliocostalis
• Longissimus
• Spinalis
• Deep
• Rotators
• Brevis
• Short
• Longus
• Interspinales
• Intertransvesarii
• Multifidus

22. Semispinalis Thoracis
• Origin
• Transverse process of T6-T10/12
• Insertion
• Spinous process C6-C7 & T1-T4
• Function
• Ext of the neck thoracic vertebrae
• Neck & thoracic rotation to the opposite
side
• Laterally flex neck & thoracic vertebrae

23. SPINALIS THORACIC

24. SPINALIS THORACIS

25. Semi

28. ILIOCOSTALIS

30. LONGISSIMUS

31. LONGISSIMUS

33. Spinal Extensors

34. MULTIFIDUS
• Multifidus muscles are very short
muscles running from TVP of one
vertebra up to the spinous process
of the next vertebra upwards
• Their main function is back stability
• They do not produce a large range
of movement, but work to produce
small, "fine-tuning" postural
movements, all day long

35. MULTIFIDUS
• Stabilizing
• Lateral flexion
• Contralateral rotation
• Lumbar curve
• Walking
• Coughing-Sneezing

37. SERRATUS POSTERIOR
• Origin: SP T11-L2
• Insertion: Ribs 9-12
• Functions:
• Deep expiration
• Rotation
• Trunk extension

40. INTERNAL OBLIQUE

41. INTERNAL OBLIQUE, FUNCTION
• Trunk flexion
• Abdominal compression
• Deep Exhale
• Rotation, same side

42. EXTERNAL OBLIQUE

43. EXTERNAL OBLIQUE
• One of the outermost abdominal muscles, extending
from the lower half of the ribs around and down to the
pelvis
• The lowest part connects to the crest of the ilium, the
pubis, and the linea alba
• Function:
• Trunk flexion
• Abdominal compression
• Deep Exhale
• Rotation, opposite side

48. HIP FLEXOR, PSOAS MUSCLE

50. Functions:
• Quadratus Lumborum fixes the
12th rib to stabilize diaphragm
attachments during inspiration
• Lateral flexes the vertebral column
• Extends lumbar vertebrae
• It forms with the
contralateral TFL and G.Medius to
maintain frontal plane stability of
the pelvis

51. HIP FLEXOR, PSOAS MUSCLE
• Origin: T12-L5
• Insertion: lesser
trochanter of femur
• Innervation: L1-L3

52. ILIACUS MUSCLE
• Origin: iliac fossa
• Insertion: base of
lesser trochanter
• Innervation: femoral
nerve