Superficial back muscles Flashcards
Trapezius ascending part action?
draws scapula medially downward
Trapezius transverse part action?
draws scapula medially
Trapezius descending part action?
- scapula obliquely upward
- rotates glenoid cavity superiority
- tilts head to same side
- rotates it to opposite
Trapezius ascending part innervation?
Trapezius transverse part innervation?
Trapezius descending part innervation?
spinal accessory for all 3
Levator scapulae action?
- scapula medially upward
- inferior angle medially
- inclines neck to same side
Levator scapulae innervation?
dorsal scapular
Rhomboid major and minor action? Nerve?
- steadies scapula
- draws scapula medially upward
- dorsal scapular nerve
Latissimus dorsi action? Nerve?
- internal rotation
- adduction
- extension
- respiration (“cough muscle”)
- Thoracodorsal nerve
Teres major action? Nerve?
- internal rotation
- adduction
- extension
- Lower subscapular nerve
What are the three types of interactions between latissimus dorsi and the inferior angle of the scapula?
- Type 1: Direct Attachment (muscular slips are anchored directly onto the inferior angle of the scapula.
- Type 2a: Indirect Attachment (few muscle fibers with a soft, fibrous link between the two (fascia))
- Type 2b: No Attachment (a bursa and no connective tissue between the two. 21% of the population had no attachment at all)
The majority of people (79%) had either a Type 1 (direct, 43%) or Type 2a (indirect, 36%)
Thoracodorsal nerve is off of what cord?
the posterior cord (UTLRA)
Lower subscapular nerve is off of what cord and what muscle?
posterior cord subscapular muscle
Shoulder girdle elevators:
- Rhomboid major
- Rhomboid minor
- Levator scapulae Trapezius (superior part)
Shoulder girdle depressors:
- Trapezius (inferior part)
- Pectoralis minor
Shoulder girdle superior rotators:
- Serratus anterior
- Trapezius (superior part)
Shoulder girdle inferior rotators:
- Rhomboid major
- Rhomboid minor
- Levator scapulae
- Deltoid action anterior head?
- Deltoid action posterior head?
- Nerve?
- Anterior
- shoulder flexion
- horizontal abduction
- Internal Rotation
- Posterior
- Shoulder extension
- horizontal adduction
- external rotation
- Axillary Nerve
Quadrangular space boundaries?
Quadrangular space nerve?
- Teres major
- Teres minor
- Triceps brachii
- Humerus
- Axillary Nerve
Pectoralis major action? Nerve
- Flexion
- Respiration
- Medial and Lateral pectoral nerve
Pectoralis minor action? Nerve?
- draws scapula downward
- rotates glenoid inferiorly
- respiration
- medial pectoral nerve
Coracobrachialis action? Nerve?
- shoulder flexion
- adduction
- musculocutaneous nerve
Subclavius action? Nerve?
- steadies clavicle
- nerve to subclavius
Serratus anterior
- Superior action?
- Intermediate action?
- Inferior action?
- Nerve?
-
superior
- medial rotation of scapula
-
intermediate
- protracts scapula
- elevates ribs when shoulder is fixed
-
inferior
- rotates scapula laterally (assisting lower trapezius)
- long thoracic nerve
Supraspinatus action? Nerve?
- shoulder abduction (instrumental for the “setting phase”)
- suprascapular nerve
Infraspinatus action? Nerve?
- External rotation
- suprascapular nerve
Teres minor action? Nerve?
- External rotation
- axillary nerve
Subscapularis action? Nerve?
- IR of shoulder
- upper and lower subscapular
- What is the 5th rotator cuff muscle?
- What does it do?
- Biceps brachii
- The tendon of its long head prevents superior migration.
Tendon of the long head of the biceps tendon articulation?
intra-articular but extra-synovial
Biceps brachii action? Nerve?
- elbow flexion
- supination
- shoulder flexion
- stabilizer of humeral head during deltoid contraction
- physical block to superior and anterior GH translation
- internal rotation
- abduction of humerus
- assist the rotator cuff in creating GH joint compression
- musculocutaneous nerve
Brachialis action? Nerve?
- elbow flexion
- musculocutaneous and radial nerve
- Triceps brachii long head action?
- Triceps brachii entire muscle action?
- Nerve?
- long head
- shoulder extension
- shoulder adduction
- entire muscle
- elbow extension
- radial
Anconeus action? Nerve?
- extends elbow
- tightens the joint
- radial nerve
