Scapulohumeral Muscles Flashcards by Ben Holtom

Q

Scapulohumeral Muscles

A

Rotator Cuff:

Subscapularis
Supraspinatus
Infraspinatus
Teres Minor

Others:

Teres Major
Deltoid
Triceps Brachii

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Q

Subscapularis origin

A

Subscapular Fossa of Scapula

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Q

Subscapularis insertion

A

Lesser tubercle of the humerus

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Q

Subscapularis innervation

A

Upper and Lower Subscapular Nerve

branches of the post. cord of BP

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Q

Subscapularis arterial supply

A

subscapular artery

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Q

Supraspinatus origin

A

supraspinous fossa of scapula

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Q

Supraspinatus insertion

A

greater tubercle of humerus; superior facet

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Q

Supraspinatus innervation

A

Suprascapular nerve

(upper trunk of BP)
through suprascapular notch
deep to supra / infraspinatus

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Q

Supraspinatus arterial supply

A

Suprascapular artery

“above” suprascapular notch
deep to supra / infraspinatus

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Q

Infraspinatus origin

A

infraspinous fossa of scapula

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Q

Infraspinatus insertion

A

greater tubercle of humerus; middle facet

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Q

Infraspinatus innervation

A

Suprascapular nerve

(upper trunk of BP)
through suprascapular notch
deep to supra / infraspinatus

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Q

Infraspinatus arterial supply

A

Suprascapular artery

“above” suprascapular notch
deep to supra / infraspinatus

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Q

Teres minor origin

A

lateral border of scapula; superior portion

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Q

Teres minor insertion

A

Greater tubercle of humerus; inferior facet

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Q

Teres minor innervation

A

Axiallary nerve

posterior chord of BP
travels with posterior humeral artery
found in quadrangular space
dumps into deltoid

Q

Teres minor arterial supply

A

Posterior humeral circumflex artery

branch of the axillary artery
travels with axillary nerve
found in quadrangular space
dumps into deltoid

Q

Supraspinatus action

A

abduction

Q

Infraspinatus action

A

external rotation arm

Q

teres minor action

A

external rotation and adduction of arm

Q

Deltiod origin

A

Lateral third of clavicle
acromion of scapula
spine of scapula

Q

Deltoid insertion

A

deltoid tuberosity of humerus

Q

deltoid innervation

A

axillary nerve

also innervates teres minor
travels with posterior humeral circumflex artery

Q

deltoid arterial supply

A

posterior circumflex humeral artery

branch of the axillary artery
travels with axillary nerve
found in quadrangular space

Teres major origin

posterior surface of inferior angle of scapula

Teres major insertion

medial lip of intertubercular grove of humerus

Teres major innervation

lower subscapular nerve - also innervates subscapularis

Teres major action

internal rotation adduction extension of arm