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Latissimus dorsi muscle
- Origin: Spinous processes of T7 to sacrum
- Inferior angle of scapula
- Iliac crest
- Lower (10-12) ribs
- Thoracolumbar fascia
- Insertion: Lesser tubercular of the humerus
- Ridge and intertubercular sulcus of the humerus
- Innervation: thoracodorsal nerve (C6-C8)
- Function: Extension
- Adduction
- Medial rotation of humerus
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Serratus posterior superior muscle
- Origin: spinous processes of C7-T3
- Insertion: 2-5 ribs
- Innervation: intercostal nerves
- anterior rami of T2-T5 thoracic nn
- Function: respiration
- Elevate ribs
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Rhomboid minor muscle
- Origin: ligamentum nuchae
- Spinous process C7/ C7-T1
- Insertion: vertebral border of scapula at root ofspine
- Innervation: dorsal scapular nerve (C5)
- Function: elevation of scapula
- Retraction of scapula and shoulder
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Serratus posterior inferior muscle
- Origin: spinous processes of T11-L3
- Insertion: 9-12 ribs
- Innervation: intercostal nerves
- anterior rami of T9-T12 thoracic nn
- Function: respiration
- Depress ribs
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Rhomboid major muscle
- Origin: spinous processes C7-T4 / T2-T5
- Insertion: vertebral border of scapular below spine
- Innervation: dorsal scapular (C5)
- Function: elevation of scapula
- Retraction of scapula and shoulder
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Levator scapulae muscle
- Origin: transverse processes of C1-C4
- Insertion: vertebral border of scapula above spine
- Innervation: cervical nerves 3 and 4
- Dorsal scapular nerve
- Function: elevation of scapula
- Retraction of scapula and shoulder
- Downward rotates the scapula
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trapezius muscle
- Origin: Medial 1/3 of superior nuchal line
- External occipital protuberance
- Ligamentum nuchae (dorsal edge) –
- whole extension to C7
- Spinous processes C7/T1-T12
- Insertion: Lateral 1/3 of clavicle
- Acromion
- Spine of scapula
- Tubercle of the spine
- Innervation: cranial nerve XI (accessory nerve)
- Proprioceptive fibers to spinal cord levels C3 & C4
- Function: Elevation
- Retraction
- Rotation of scapula
- Depresses scapula
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What is this?
External occipital protuberance
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What is this?
Mastoid process
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Spinous processes (vertebra prominens)
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What and where is ligamentum nachae?
- It is a triangular, sheet-like structure in the median sagittal plane:
- the base of the triangle is attached to the skull, from the external occipital protuberance to the foramen magnum
- the apex is attached to the tip of the spinous process of vertebra C7
- the deep side of the triangle is attached to the posterior tubercle of vertebra C1 and the spinous processes of the other cervical vertebrae
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What are the parts of the scapula?
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Where is thoracolumbar fasica?
- The thoracolumbar fascia covers the deep muscles of the back and trunk. This facial layer is critical to the overall organization and integrity of this region:
- superiorly, it passes anteriorly to the serratus posterior superior muscle and is continuous with the superficial lamina of the investing layer of cervical fascia in the neck
- in the thoracic region, it covers the deep muscles and separates them from the muscles in the superficial and intermediate groups
- medially, it attaches to the spinous processes of the thoracic vertebra and, laterally, to the angles of the ribs.
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What muscle is origin on the crest of the ilium?
latissimus dorsi muscle
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What is the sacrum?
the sacrum is a single bone that represents the five fused sacral vertebrae.
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What is this?
Trapezius muscle
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what is this?
Latissimus dorsi muscle
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What is this?
Levator scapulae muscle
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What is this?
Rhomboid major muscle
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What is this?
Rhomboid minor muscle
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What is this?
Serratus posterior superior muscle
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What is this?
Serratus posterior inferior muscle
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What muscle does the accessory nerve innervate?
trapezius muscle
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What nerve innervates the latissimus dorsi muscle?
Thoracodorsal nerve
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What nerve innervates this/ these muscles?
Dorsal scapular nerve
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What plexus runs under the trapezius?
Transverse cervical artery and nerve
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If the accessory nerve was damaged, what would happen?
The scapula would not be able to elevate, retract, depress or rotate
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What would happen if the thoracodorsal nerve was damaged?
the latissimus dorsi would not be able to extend, adduct, or medially rotate the humerus
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