ANAT 1615 Master Lecture Notes

ANAT 1615 Master Lecture Notes - 1 Back Superficial or...

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Back Superficial or Extrinsic Back Muscles Trapezius Origin 1. medial third of superior nuchal line 2. external occipital protuberance 3. nuchal ligament ( ligamentum nuchae ) 4. spinous process of C7 – T 12 vertebrae Insertion 1. lateral third of clavicle 2. spine of scapula 3. acromion of scapula Nerve supply 1. spinal root of accessory nerve – motor ( 11 th cranial nerve ) 2. ventral rami of C3 and C4 – sensory – pain and proprioception Actions 1. superior fibers elevates the scapula 2. middle fibers retracts and rotates the scapula 3. inferior fibers depresses the scapula Triangle of auscultation Boundaries 1. upper border of latissimus dorsi 2. lateral border of trapezius| 3. medial border of scapula | Floor is formed by the rhomboideus major Clinical importance This triangular is a good place to examine the posterior segments of the lungs with a stethoscope Latissimus dorsi Origin 1. spinous processes of lower 6 thoracic vertebrae 2. thoracolumbar fascia 3. iliac crest 4. lower 3 or 4 ribs Insertion - into the floor of the intertubercular sulcus ( bicepetal groove ) of the humerus 1
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Nerve supply - thoracodorsal nerve – C6, C7, C8 ( branch of the posterior cord of the brachial plexus ) Actions 1. extends, adducts and medially rotates the humerus 2. raises the body toward the arms during climbing Injury to thoracodorsal nerve 1. during surgical operations in the inferior part of the axilla, the thoracodorsal nerve supplying the latissimus dorsi is vulnerable to injury 2. it is also vulnerable to injury during operations on scapular lymph nodes, close to subscapular artery 3. with the paralysis of latissimus dorsi, the person is unable to raise the trunk, during climbing Levator scapulae Origin - posterior tubercles of transverse processes of C1 – C4 vertebrae Insertion - into the superior part of the medial border of the scapula ( dorsal surface ) Nerve supply 1. dorsal scapula rnerve ( C5 root ) 2. ventral rami of C3 C4 nerves Actions - elevates the scapula and tilts its glenoid cavity inferiorly by rotating the scapula Rhomboideus minor Origin 1. nuchal ligament ( ligamentum nuchae ) 2. spinous process of C7 – T1 Insertion - middle part of the medial border of the scapula on the dorsal surface Nerve supply - dorsal scapular nerve – C5 root Actions - retracts the scapula and rotates it to depress the glenoid cavity Rhombodieus major Origin - spinous process of T2 – T5 vertebrae Insertion - into the medial border of scapula from the level of spine to inferior angle – dorsal surface Nerve supply - dorsal scapular nerve – C5 root 2
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Actions - retracts the scapula and rotates it to depress the glenoid cavity Injury to dorsal scapular nerve 1. affects the actions of rhomboids muscles 2. if the rhomboids of one side are paralyzed, the scapula on the affected side is located further from the midline than that of the other side Intermediate extrinsic back muscles Serratus posterior superior Origin 1. ligamentum nuchae 2. spinous process of C7 – T3 vertebrae
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This note was uploaded on 11/21/2011 for the course ANAT 1615 taught by Professor Samueldemons during the Fall '10 term at Life Chiropractic College West.

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ANAT 1615 Master Lecture Notes - 1 Back Superficial or...

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