Extrinsic Back Muscles.txt

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Author:
mnm2186
ID:
29072
Filename:
Extrinsic Back Muscles.txt
Updated:
2010-08-05 18:29:28
Tags:
Anatomy
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Description:
Exam 1
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  1. Superficial Extrinsic Back Muscles
    • (1st Layer)
    • Trapezius
    • Latissimus Dorsi

    • (2nd Layer)
    • Levator Scapulae
    • Rhomboid Minor
    • Rhomboid Major
  2. Superficial extrinsic back muscles attach to the...
    Upper Limb - appendicular skeleton
  3. Intermediate Extrinsic Back Muscles
    • Serratus Posterior Superior
    • Serratus Posterior Inferior
  4. Intermediate extrinsic back muscles attach to the...
    Ribs
  5. Trapezius: Attachments
    • External Occipital Protuberance
    • Medial 1/3 Superior Nuchal Line
    • Nuchal Ligament (to C7)
    • Spinous Processes C7-T12

    • Spine of the Scapula
    • Acromion (medial edge)
    • Lateral 1/3 of clavicle
  6. Trapezius: Innervation & Blood Supply
    • Spinal Accessory Nerve (CN XI) for motor.
    • C3, C4 spinal nerves for pain (sensory) and procioceptive fibers

    Transverse Cervical A. (superficial branch)

    (additional contributions from acromial branch of suprascapular a. and dorsal branches of posterior intercostal arteries)
  7. Trapezius: Action
    • Descending elevates scapula
    • Middle retracts scapula
    • Ascending depresses scapula

    Descending and Ascending combined rotates glenoid cavity superiorly
  8. Latissimus Dorsi: Attachments
    • T7 - T12 spinous processes
    • Thoracolumbar fascia
    • Iliac crest
    • Ribs 9 - 12 (inferior 3 or 4 ribs)

    Floor of intertubercular sulcus (bicipital groove) of humerus medial to the insertion of pectoralis major
  9. Latissimus Dorsi: Innervation & Blood Supply
    • Thoracodorsal N. (C6, C7, C8)
    • (originates from posterior cord of brachial plexus, sometimes called middle scapular nerve)

    • Thoracodorsal A.
    • (branch of subscapular a.)
  10. Latissimus Dorsi: Action
    Extends, adducts, and medially rotates humerus.

    Raises body toward arms during climbing.
  11. Rhomboid Minor: Attachments
    Spinous processes of C7 - T1

    Root of scapular spine (medial end)
  12. Rhomboid Minor: Innervation and Blood supply
    Dorsal Scapular nerve (C4, C5)

    Transverse Cervical A. (deep branch)

    Note: sometimes called dorsal scapular a. but not very accurate
  13. Rhomboid Minor: Actions
    • Retracts scapula
    • Elevates scapula

    With other muscles it rotates scapula to depress gleniod cavity.
  14. Rhomboid Major: Attachments
    Spinous processes of T2-T5 vertebrae

    Medial border of scapula (inferior to root of scapular spine)
  15. Rhomboid Major: Innervation & Blood Supply
    Dorsal Scapular nerve (C4, C5)

    Transverse Cervical A. (deep branch)

    Note: sometimes called dorsal scapular a. but not very accurate
  16. Rhomboid Major: Actions
    • Retracts scapula
    • Elevates scapula

    With other muscles it rotates scapula to depress gleniod cavity.
  17. Levator Scapulae: Attachments
    C1 - C4 transverse processes (posterior tubercles)

    Medial border of scapula (superior to root of scapular spine)
  18. Levator Scapulae: Innervation & Blood Supply
    • Anterior Rami (C3, C4)
    • Dorsal Scapular N. (C4, C5)

    Transverse Cervical A. (deep branch)
  19. Levator Scapulae: Actions
    Elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula

    Extends or laterally flexes neck when scapula are fixed
  20. Serratus Posterior Superior: Attachments
    • Lower part of ligamentum nuchae
    • C7 - T3 spinous processes

    Ribs 2 - 4 (superior border)
  21. Serratus Posterior Superior: Innervation & Blood Supply
    • Anterior Rami!!!
    • (T2 - T5 intercostal nerves)

    Intercostal arteries
  22. Serratus Posterior Superior: Actions
    • Proprioreception
    • Elevate upper ribs (forced respiration)
  23. Serratus Posterior Inferior: Attachments
    T11 - L2 spinous processes

    Ribs 8 - 12 (inferior border)
  24. Serratus Posterior Inferior: Innervation & Blood Supply
    • Anterior Rami!!!
    • (T9 - T11 intercostal nerves; T12 subcostal n.)

    Intercostal arteries
  25. Serratus Posterior Inferior: Actions
    • Proprioreception
    • Stabilize lower ribs against diaphragm contraction

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