Lab 5: Myology - Pectoral Area and Ventral Upper Limb Flashcards
what muscles are in this muscle group: muscles crossing shoulder joint
- pectoralis major
- latissimus dorsi
- deltoid
AOI of pectoralis major
- action: adducts, flexes, and medially rotates arm
- origin: clavicle, sternum, and ribs
- insertion: humerus (intertubercular sulcus)
human OR human and cat: pectoralis major
both
AOI of latissimus dorsi
- action: adducts, extends, and medially rotates arm
- origin: scapula, vertebral column, and iliac crest
- insertion: humerus (intertubercular sulcus)
human OR human and cat: latissimus dorsi
both
AOI of deltoid
- action: abducts, flexes, and rotates arm medially and laterally
- origin: clavicle and scapula
- insertion: deltoid tuberosity of humerus
human OR human and cat: deltoid
both
what muscles are in this muscle group: posterior thorax
- trapezius
- levator scapulae
AOI of trapezius
- action: adducts and rotates scapula; elevation and depression of scapula
- origin: superior nuchal line of occipital bone and vertebral column
- insertion: lateral clavicle and scapular spine and acromion
human OR human and cat: trapezius
both
AOI of levator scapulae
- action: elevation of scapula, lateral neck flexion
- origin: transverse processes of cervical vertebrae (C1-C4)
- insertion: medial border (scapula)
human OR human and cat: levator scapulae
both
what muscles are in this muscle group: anterior thorax
- pectoralis minor
AOI of pectoralis minor
- action: stabilizes, abducts, and rotates scapula
- origin: ribs 3-5
- insertion: scapula (coracoid process)
human OR human and cat: pectoralis minor
both
what muscles are in this muscle group: shoulder joint
- subscapularis
- infraspinatus
- supraspinatus
- teres minor
- teres major
- coracobrachialis
what muscles of the shoulder joint are rotator cuff muscles
- subscapularis
- infraspinatus
- supraspinatus
- teres minor
AOI of subscapularis
- action: medial rotation of arm; stabilizes humerus head in glenoid cavity
- origin: subscapular fossa of scapula
- insertion: lesser tubercle of humerus
human OR human and cat: subscapularis
both
AOI of infraspinatus
- action: lateral rotation of arm; stabilizes humerus head in glenoid cavity
- origin: infraspinous fossa of scapula
- insertion: greater tubercle of humerus
human OR human and cat: infraspinatus
both
AOI of supraspinatus
- action: abduction of arm; stabilizes humerus head in glenoid cavity
- origin: supraspinous fossa of scapula
- insertion: greater tubercle of humerus
human OR human and cat: supraspinatus
both
AOI of teres minor
- action: lateral rotation and adduction of arm; stabilizes humerus head in glenoid cavity
- origin: lateral border of scapula
- insertion: greater tubercle of humerus
human OR human and cat: teres minor
both
what is the common action of rotator cuff muscles
stabilizing the humerus head in the glenoid cavity
AOI of teres major
- action: medial rotation, adduction, and extension of arm
- origin: inferior angle and lateral border of scapula
- insertion: intertubercular sulcus of humerus
human OR human and cat: teres major
both