Muscles Flashcards
Which muscles are innervated by the suprascapular nerve
Infraspinatus & supraspinatus
What is the supraspinatus’ main muscle action
Abduction of GH joint
Also: ER
What is the main muscle action of the infraspinatus?
ER of GH joint
Also: also horiz abduction
What innervates the teres minor
Axillary nerve
What innervates the subscapularis
Upper & lower subscapular nerves
What is the teres minor muscle action
ER GHJ
Horiz abd GHJ
Adduct GHJ
What does the sternocleidomastoid do
Cervical extension, ipsilateral sidebend, contralateral rotation
Which nerve innervates the SCM
Accessory nerve (CN XI)
What does the subclavius do?
Stabilize the clavicle
Which nerve innervates the subclavius
Subclavian nerve
What is the muscle action of the pectoralis minor
Anterior tip of scapula
Abduct/protract scapula
Downward rotate scapula
Depress scapula
Which muscles contribute to downward rotation of the scapula
Rhomboid major & minor Levator Scapulae Serratus Anterior (superior) Pectoralis minor Pectoralis major (sternal)
Which nerves innervate the pectoralis minor
Medial & lateral pectoral nerves
How do the superior & inferior fibers of the serratus anterior differ?
Superior fibers: elevate & downward rotate scapula
Inferior fibers: depress & upward rotate scapula
Which nerve innervates the serratus anterior
Long thoracic nerve
Whis is muscle action of all fibers of serratus anterior
Abduct/protract scapula
Stabilize medial border of scapula
Which portions of the trapezius elevate the scapula?
Trap I & II (descending)
Which portions of the trapezius depress the scapula?
Trapezius IV (ascending)
What are the muscle actions of the trapezius III (transverse)?
Adduct/retract scapula
Which nerve innervates the trapezius?
Accessory nerve (CN XI)
What are the muscle actions of the trapezius IV (ascending)?
Upward rotation
Depression
Adduct/retraction
What are the muscle actions of the descending trapezius (I & II)?
Upward rotation Elevation Adduction/retraction Ipsilateral side bend Contralateral rotation
What are the muscle actions of the levator scapulae?
Elevate scapula
Downward rotate scapula
Which muscles are innervated by the dorsal scapular nerve?
Rhomboid major & minor
Levator scapulae
Which nerve innervates the deltoids?
Axillary
Which nerve innervates the latissimus dorsi
Thoracodorsal
Which nerve innervates the teres major
Lower subscapular nerve
Which nerve innervates the pectoralis major?
Medial & lateral pectoral nerves
Which nerve innervates the coracobrachialis
Musculocutaneous
What is the middle deltoid muscle action?
GH Abduction
What are the muscle actions of the anterior deltoid?
Add GH at <60 abd Abd GH >60 abd Flex GH IR GH Horiz adduct GH
What are the muscle actions of the posterior deltoid?
Abd GH at >60 abd Add GH at <60 abd Ext GH ER GH Horiz abd GH
What are the muscle actions of the latissimus dorsi?
Add GH Ext GH IR GH Horzi abduct GH Retract scapula Downward rotate scapula Depress scapula
Teres major musle action
Add GH
Ext GH
Ir GH
Horiz abd GH
Which muscles adduct the GH?
Pectoralis major Latissimus dorsi Teres major & minor Ant & Post deltoid if <60 degrees flexion Coracobrachialis
Which muscles are innervated by the radial nerve?
Triceps
Anconeus
Brachioradialis
