Muscles of the Shoulder/Scapula Flashcards
Rhomboid Minor (Origin & Insertion)
O: Vertebral spines of C7-T1
I: Sup vertebral border of scapula
Rhomboid Minor (Actions)
Elevates, retracts, & rotates scapula down
Rhomboid Minor (Nerve & Artery)
N: Dorsal scapular N
A: Dorsal scapular A
Trapezius (Origin & Insertion)
O: Occipital region & spines of C2-T12
I: Scapular spine, acromion, & lat clavicle
Trapezius (Actions)
Elevates, depresses & retracts scapula
Rotates scapula up
I/O extends head/neck
Trapezius (Nerve & Artery)
N: Spinal accessory N XI
A: Transverse cervical A
Levator Scapulae (Origin & Insertion)
O: Transverse processes of C1-C4
I: Sup angle of scapula
Levator Scapulae (Actions)
Elevates scapula
Rotates scapula down
I/O lat flexes neck
Levator Scapulae (Nerve & Artery)
N: Dorsal scapular N
A: Dorsal scapular A
Rhomboid Major (Origin & Insertion)
O: Vertebral spines of T2-T5
I: Vertebral border of scapula
Rhomboid Major (Actions)
Elevates, retracts, & rotates scapula down
Rhomboid Major (Nerve & Artery)
N: Dorsal scapular N
A: Dorsal Scapular A
Latissimus Dorsi (Origin & Insertion)
O: Spines of T7-L5, Sup sacrum, & iliac crest
I: Scapular inf angle & lateral lip of humeral lesser tubercle
Latissimus Dorsi (Actions)
A prime mover for extending & adducting shoulder Int rotates shoulder Rotates scapula down Depresses & retracts scapula I/O compresses ribcage
Latissimus Dorsi (Nerve & Artery)
N: Thoracodorsal N
A: Thoracodorsal A
Serratus Anterior (Origin & Insertion)
O: Anterolateral ribs 1-8
I: Ant vertebral border of the scapula
Serratus Anterior (Actions)
Prime mover for protracting scapula
Depresses scapula
Rotates scapula up
I/O expands ribcage
Serratus Anterior (Nerve & Artery)
N: Long thoracic N
A: Lat thoracic A
Subscapularis (Origin & Insertion)
O: Subscapular fossa
I: Lesser tubercle of ant humerus
Subscapularis (Actions)
Prime mover for internally rotating shoulder
Adducts & flexes shoulder
Subscapularis (Nerve & Artery)
N: Upper & lower subscapular Nn
A: Subscapular A
Supraspinatus (Origin & Insertion)
O: Supraspinous fossa of scapula
I: Sup greater tubercle of humerus
Supraspinatus (Actions)
Abducts shoulder
Supraspinatus (Nerve & Artery)
N: Suprascapular N
A: Suprascapular A
Infraspinatus (Origin & Insertion)
O: Infraspinous fossa of scapula
I: Post greater tubercle of humerus
Infraspinatus (Actions)
Prime mover for externally rotating shoulder
Helps adduct & extend shoulder
Infraspinatus (Nerve & Artery)
N: Suprascapular N
A: Suprascapular A
Teres Minor (Origin & Insertion)
O: Axillary border of the scapula
I: Post greater tubercle of the humerus
Teres Minor (Actions)
Prime mover for externally rotating shoulder
Helps adduct & extend shoulder
Teres Minor (Nerve & Artery)
N: Axillary N
A: Circumflex scapular A
Teres Major (Origin & Insertion)
O: Inf angle of scapula
I: Med lip of bicipital sulcus
Teres Major (Actions)
Adducts, extends, & internally rotates shoulder
Teres Major (Nerve & Artery)
N: Lower subscapular N
A: Circumflex scapular A
Deltoideus (Origin & Insertion)
O: Scapular spine, acromion, & lat clavicle
I: deltoid tuberosity of humerus
Deltoideus- Anterior Head (Actions)
Internally rotates, flexes, & abducts shoulder
Deltoideus- Superior Head (Actions)
Abducts shoulder
Deltoideus- Posterior Head (Actions)
Externally rotates, extends, & abducts shoulder
Deltoideus (Nerve & Insertions)
N: Axillary N
A: Ant & Post humeral circumflex Aa
