Week 8 Muscles of the Back PALP edit

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  1. Latissimus Dorsi  
    (superficial muscle of the back)
    • O: Iliac crest, Thoraco-lumbar (T/L) fascia, SP's of last 6 thoracic vertebrae and last 3-4 ribs 
    • F.D: superior lateral
    • Insertion: Floor of the intertubercular groove
    • Action: Extension, adduction and medial rotation of the humerus
    • Nerve: Thoracodorsal nerve
    • Special: Broadest muscle of the back

    O and I switch then the action is that the body raises towards the arms (chin up).Thin, superficial and ascends the side of the trunk.Image Upload
  2. Trapezius
    (Superficial muscle of the back)
    • O: EOP, medial 1/3rd superior nuchal
    • line, nuchal ligament and SP’s of C7 to T12 

    • F.D:  upper - inferior lateral . middle - lateral
    • lower - superior lateral

    • I: Lateral 1/3 of clavicle, acromion
    • and spine of scapula

    • A: Upper fibers elevate, middle
    • fibers retract and inferior fibers depress the scapula

    N: Spinal accessory nerve (CN 11)

    Image Upload
  3. Rhomboid Minor
    (superficial muscle of the back)
    O: nuchal ligament and SP’s of C7-T1                                               

    F.D: inferior lateral

    • I: Medial border of scapula at the
    • spine of the scapula

    • A: Adducts (retracts scapula), fixes
    • scapula to thoracic wall (assists serratus anterior)

    N: Dorsal scapular nerve 

    Image Upload
  4. Rhomboid Major
    (superficial muscle of the back)
    O: SP of T2-T5 

    FD:inferior lateral

    • I: Medial border of scapula between
    • spine and inferior angle

    • A: Adducts (retracts scapula), fixes
    • scapula to thoracic wall (assists serratus anterior)

    N : Dorsal Scapular nerve

    • Image Upload
  5. Levator Scapulae
    (superficial muscle of the back)
    • O: Posterior tubercle tubercles of TVP’s 
    • C1-C4

    F.D: inferior posterior                

    • I: Medial border of scapula superior
    • to the root of spine of scapula

    • A: Elevates scapula and performs
    • downward rotation of the scapula

    N: Dorsal scapular nerve

    S: deep to upper fibers of trapezius

    Image Upload
  6. Pectoralis Major
    (anterior trunk muscle)
    • O:  
    • Clavicular Head:Anterior surface of                                                           
    • the medial ½ of the clavicle                                                  

    • Sternal Head: Anterior sternum, superior                                                  
    • 6 costal cartilages and aponeurosis of                                                          
    • the external oblique abdominal muscles

    F.D: lateral

    • I: Lateral lip of the
    • inter-tubercular groove                                                  
    • of the humerus

    • A: Adduct, internal rotation of
    • the humerus and extends the arm from 90                                             
    • degrees of flexion (The clavicular head                                                
    • alone will also aid in flexion of the arm)

    • N: Lateral and medial pectoral nerve
    • Image Upload
  7. Pectoralis Minor
    (Anterior trunk muscles)
    • O: Ribs 3-5 close to their costal
    • cartilage

    F.D: superior lateral

    I: Coracoid process of the scapula

    • A: Stabilize the scapula by drawing
    • it inferiorly and anteriorly against the thoracic wall

    N: Medial pectoral nerve

    • Image Upload
  8. Subclavius
    • O: Junction of first rib and it’s
    • cartilage

    F.D: superior lateral

    • I: Inferior aspect of clavicle (middle
    • third)

    • A: Draws clavicle medially and
    • anteriorly

    N: Nerve to Subclavius

    • Image Upload
  9. Serratus Anterior
    (superfical trunk muscle)
    • O: External surfaces of the lateral
    • part of the ribs 1-8

    F.D: posterior superior

    • I: Anterior surface of the medial
    • border of scapula

    • A: Protracts the scapula and holds it
    • against the thoracic wall, upward rotation of scapula

    N: Long thoracic nerve

    • Image Upload
  10. External Intercostal Muscle
    • O: Inferior border of the superior
    • ribs

    F.D:Anterior inferior

    • I: Superior border of the inferior
    • ribs

    • A: Elevates the ribs during
    • inspiration

    N: Intercostal nerves 

    Image Upload

    •This muscle has an anteroinferior fiber direction (“hands in my pocket”)

    •Medial to the costochondral junction, this muscle becomes the external intercostal membrane
  11. Internal Intercostal
    • O: Superior border of the inferior
    • rib

    F.D: anterior superior

    • I: Inferior border of the superior
    • rib

    • A: Depress the ribs during forced
    • expiration

    N: Intercostal nerves

    Image Upload

    • •This muscle lies deep to the
    • external intercostal muscle

    • •This muscle has a anterior-superior
    • direction

    • •Posteriorly from the angle of the
    • rib (to the tubercle) this muscle becomes the internal intercostal membrane
  12. Thoracic Diaphragm
    • O:
    • Sternal attachments: internal aspect of the xiphoid process

    • Costal attachments: Costal
    • cartilages of ribs 6 – 10 and ribs 10-12

    Lumbar attachment: lumbar vertebral bodies of L1-L3(4) on the right and L1-L2(3) on the left

    F.D: central

    I: Central tendon

    A: Primary muscle of inspiration

    I: C3,C4,C5 ventral/anterior primary rami

    SS: Its the only muscle that inserts onto itself

    • Image Upload
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Week 8 Muscles of the Back PALP edit
2013-08-05 14:13:31

Intro ( week 8)
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