Pectoral Girdle O/I/A

• subclavius muscle attachments

  O: 1st rib

  I: Inferior surface of clavicle
• INnervation and blood supply of the subclavius?

  Inn: N to subclavius

  Supply: Thoracoacromial

  artery (clavicular branch)
• Attachment points for supraspinatus?

  O: Supraspinous fossa

  I: Greater tubercle of humerus
• Supraspinatus innervation?

  Suprascapular Nerve
• Infraspinatus attachment points

  O: Infraspinous fossa

  I: Greater tubercle of humerus
• INfraspinatus innervation?

  suprascapular nerve
• Attachment points for Teres Minor?

  O: Lateral border of scapula

  I: Greater tubercle of humerus
• Innervation of Teres Minor?

  Axillary nerve
• Teres Minor actions?

  External rotation of arm, some adduction
• Subscapularis attachment points?

  O: Subscapular fossa

  I: Lesser tubercle of humerus
• Subscapularis is innervated by?

  Upper and lower subscapular nerves
• Actions of the subscapularis muscle?

  Internal rotation of arm
• Why will a patient's internal and external rotation never be equal?

  External rotation is only done by two muscles, compared to 4 muscles contributing to internal rotation
• The 2 muscles that do external rotation?

  Infraspinatus and teres minor
• 4 muscles that do internal rotation?

  Pectoralis major, subscapularis, latissimus dorsi, teres major
• Deltoid attachment points?

  O: Lateral 1/3 of clavicle, acromion and scapular spine

  I: Deltoid tuberosity of humerus
• Divsions of the deltoid and their actions

  Clavicular (anterior head) portion - flexion, internal

  rotation and adduction

  Acromial (medial head) portion - abduction

  Spinous portion (posterior head) - extension, external

  rotation and adduction
• Deltoid is innervated by?

  Axillary nerve
• Teres Major attachment points?

  O: Posterior surface of inferior angle of scapula

  I: Crest of lesser tubercle of humerus
• Teres Major is innervated by?

  Lower subscapular nerve
• Teres Major actions?

  Adducts, Internally rotates and Extends arm