Extrinsic Back Muscle

Question 1

Origin: Spinous process of T2-T5

Insertion: Medial border of scapula

Action: Rectract scapula

Synergist- mid trapezius

FD: inf-lat

Answer 1

Rhomboids major

Question 2

O: SP of C7-T1

I: sup medial border of scapula

A: retraction of scapula

FD: inf-lat

Answer 2

Rhomboids minor

Question 3

O: transverse process of vert c1-c4

I: medial border of scapulae

A: draws scapula superomedially, elevate scapula
-rotates glenoid cavity and lateral flexion of neck, extension of neck.

FD: inf-ant

Answer 3

Levator scapulae

Question 4

O: spinous process of T6-SP of sacrum, post surface of lower 6 ribs, thoracolumbar aponeurosis, post surface of ilium

I: intertubercular groove of humerus

A: medial rotator of humerus assists in adduction

FD: sup-lat

Answer 4

Latissimus dorsi

Question 5

O: sup nuchal line and ext occipital prot and SP of c7-T12.

I: lateral 3rd clavicle,acronium and spine of scapula

A: Sup- raises the scapula, rotates the scapula
Mid- mid portion of spine to mid of scapula. Retracts the scapula
Inf- depress the scapula

FD: Sup- inf,lat
Mid- lat
Inf- sup, lat

Answer 5

Trapezius