Shoulder and hand muscles Flashcards
Muscle: deltoid
* origin
* insertion
* action
* innervation
origin:
Anterior head: lateral clavicle
Middle head: acromion process of scapula
Posterior head: spine of scapula
insertion: Deltoid tuberosity
action: All heads combined: abduction of arm
Anterior head: flexion of arm, horizontal
flexion/adduction of arm, and medial
rotation of arm
Posterior head:
extension/hyperextension of arm,
horizontal extension/adduction of arm
and lateral rotation of arm
innervation: Axillary nerve
Muscle: teres major
* origin
* insertion
* action
* innervation
origin: Inferior angle and lateral border of scapula
insertion: medial lip of Intertubercular groove of
humerus
Note: unlike the teres minor which originates and inserts posteriorly, the teres major projects and inserts more anteriorly
action: Adduction of arm;
Medial rotation of arm;
Extension of arm
innervation: Subscapular nerve
Muscle: Teres minor
* origin
* insertion
* action
* innervation
origin: lateral border of scapula
insertion: greater tuberosity of the humerus
action: lateral rotation of arm; stabilization of the GHJ
innervation: axillary nerve
Muscle: Supraspinatus
* origin
* insertion
* action
* innervation
origin: Supraspinous fossa of scapula
insertion: Greater tuberosity of humerus
action: Abduction of arm; Stabilization of GHJ. external rotation of the arm at GHJ
innervation: Suprascapular nerve
Muscle: Infraspinatus
* origin
* insertion
* action
* innervation
origin: Infraspinous fossa of scapula
insertion: Greater tuberosity of humerus (posteroinferior to supraspinatus)
action: External rotation of the arm; stabilization of the GHJ
innervation: Suprascapular nerve
Muscle: Subscapularis
* origin
* insertion
* action
* innervation
origin: Subscapular fossa of scapula (on anterior
scapula!)
insertion: Lesser tuberosity of humerus
action: Medial rotation of arm; Stabilization of GHJ
innervation: Subscapular nerve
Muscle: Coracobrachialis
* origin
* insertion
* action
* innervation
origin: Coracoid process of
scapula
insertion: Body of humerus
action: Flexion of arm at GHJ, adduction of arm at the GHJ; medial/internal rotation of arm at GHJ
innervation: Musculocutaneous nerve
Muscle: abductor pollicis brevis
- action
- innervation
action: abduction of digit 1
innervation: median nerve
most lateral and superficial in the thenar eminence
Muscle: flexor pollicis brevis
- action
- innervation
action: flexion of digit 1 (aids in opposition too)
innervation: median nerve
Muscle: Opponens pollicis
* action
* innervation
action: Opposition of 1st digit
innervation: median nerve
NOTE: Deep to other
thenar muscles
Muscle: Abductor digiti minimi
* action
* innervation
action: Abduction of digit 5
innervation: Ulnar nerve
Muscle: Flexor digiti minimi
* action
* innervation
action: Flexion of digit 5
innervation: Ulnar nerve
Muscle: Opponens digiti minimi
* action
* innervation
action: Opposition of digit 5
innervation: Ulnar nerve
Thenar eminence lateral muscles
- abductor pollicis brevis
- flexor pollicis brevis
- opponens pollicis
HYPOthenar eminence (medial)
muscles
- Abductor digiti minimi
- Flexor digiti minimi
- Opponens digiti minimi
