Muscle Origins, Innervations, and Functions

Vocabulary flashcards detailing the origin, innervation, and function/action of muscles covered in the lecture notes.

Trapezius m. (Origin)

Occipital bone, spinous processes of C7-T12

Trapezius m. (Innervation)

Accessory nerve (cranial nerve 11)

Trapezius m. (Function / Action)

Elevates, retracts, rotates scapula

Latissimus Dorsi (Origin)

Spinous processes T7-T12, illiac crest, lower ribs

Latissimus Dorsi (Innervation)

Thoracodorsal nerve - tells muscle when to contract/move

Latissimus Dorsi (Function / Action)

Extension, adduction, internal rotation of shoulder joint

Rhomboid Major (Origin)

Spinous processes T2-T5

Rhomboid Major (Innervation)

Dorsal scapular nerve

Rhomboid Major (Function / Action)

Retracts scapula, anchors muscle to scapula

Teres Minor (Origin)

Lateral border of scapula

Teres Minor (Innervation)

Axillary nerve

Teres Minor (Function / Action)

External rotation of shoulder joint, stabilization of humerus head

Supraspinatus (Origin)

Supraspinous fossa of scapula

Supraspinatus (Innervation)

Suprascapular nerve

Supraspinatus (Function / Action)

Initiates abduction of Humerus (@shoulder joint

Gluteus Maximus (Origin)

Sacrum, coccyx, illium

Gluteus Maximus (Innervation)

Gluteal nerve

Gluteus Maximus (Function / Action)

Extends + laterally rotates hip

Gluteus Medius (Origin)

Outer surface of illium

Gluteus Medius (Innervation)

Superior gluteal nerve

Gluteus Medius (Function / Action)

Abduction of hip, stabilizes pelvis during movement