Anterior
What is the distal attachment for the pec major?
Lateral lip of intertubercular sulcus of humerus
What is the innervation of the trapezius?
Spinal accessory nerve
What is the proximal attachment of the subclavius?
Junction of 1st rib & its costal cartilage
What muscles does elevation & are innervated by the dorsal scapular?
- Levator scapulae
- Rhomboids
What is the prime mover in elevation of the scapula?
Trapezius descending part
What is the pec minor proximal attachment?
3rd-5th ribs near their costal cartilages
What is the levator scapulae proximal attachment?
Posterior tubercles of transverse processes of C1-C4 vertebrae
What is the 2 actions of the rhomboids?
- Retracts scapula & rotate its glenoid cavity inferiorly
- Fix scapula to thoracic wall
What muscle does upward rotation & is innervated by spinal accessory nerve?
What two muscles do protraction & are innervated by pectoral nerves?
- Pec major
- Pec minor
What is the serratus anterior innervation?
Long thoracic nerve (C5/C6/C7)
What is the proximal attachment for the rhomboid major?
Nuchal ligament/spinous processes of C7-T1
What is the 2 actions of the pec major?
- Together: adducts & medially rotates humerus + draws scapula anteriorly
- Alone: clavicular head flexes head & sternocostal head extends it from flexed position
What muscle does downward rotation & is innervated by the medial/lateral pectoral nerves?
Pec major
What is the prime mover in downward rotation?
Latissimus dorsi
What is the main action of the subclavius?
Anchors & depresses clavicle
What is the main action of the latissimus dorsi?
Extends/adducts/medially rotates humerus
What are all the actions of the trapezius?
- Descending: elevates scapula
- Middle: retracts scapula
- Ascending: depresses scapula
- Ascending/Descending: rotate glenoid cavity superiorly
What muscle does protraction & is innervated by the long thoracic nerve?
Serratus anterior
What muscle does retraction & is innervated by the dorsal scapular?
Rhomboids
What is the proximal attachment for the clavicular & sternocostal heads of the pec major?
- Clavicular head: anterior surface of medial half of clavicle
- Sternocostal head: anterior surface of sternum/superior six costal
What is the distal attachment of the rhomboids minor?
Smooth triangular area at medial end of scapular spine
What is the innervation of the pec major?
- Medial pectoral nerve (C8/T1)
- Lateral pectoral nerve (variable)
What muscles do downward rotations & are innervated by the dorsal scapular nerve?
- Levator scapulae
- Rhomboids
What head of the pec major is associated with downward rotation & is innervated by the medial pectoral?
Sternocostal head