Superficial Muscles

Question 1

General Origin and Insertion of Superficial back muscles?

Answer 1

Origin: Axial Skeleton
Insertion: Pectoral Girdle, Humerus (primarily serve upper limb)

Question 2

Trapezius

Answer 2

Question 3

Trapezius: Origin and Insertion

Answer 3

Origin: Superior Nuchal line, External Occipital Protuberance, Ligamentum Nuchae, Spinous Processes of C7-T12

Insertion: (Uppermost Fibers) Lateral Third of clavicle, Acromion Process, Spine of the Scapula
(Middle and Lower Fibers) Medial End of Scapula Spine

Question 4

Trapezius: Functions of Fibers

Answer 4

Upper: Elevate Shoulder
Middle: Retract shoulders
Upper + Lower: Rotate scapula (abduction of arm)

Question 5

Trapezius: Point of Action

Answer 5

On te shoulder but not the joint (does not cross joint)

Question 6

Trapezius: Innervation

Answer 6

Accessory Nerve Cn11/XI, c3 and C4 nerves

Question 7

Trapezius: Principal Blood Supply

Answer 7

Transverse or Superficial Cervical Arteries

Question 8

Latissumus Dorsi

Answer 8

Question 9

Lat Dors: Origin and Insertion

Answer 9

Origin (Principal): Spinous Processes of Tv7 down to back of the sacrum, from the crest of the ilium and from the lower ribs

Origin (Lumbar): Posterior lamella of the thoracolumbar Fascia, also fused to the tendon of the erector spinae muscles

Insertion: Tendon that inserts on the lesser tubercular ridge and intertubercular sulcus of the humerus

Question 10

Lat Dors: Actions

Answer 10

Extends adducts and medially rotates the Humerus

Question 11

Lat Dors: Point of Action

Answer 11

Acts on shoulder Joint (corsses joint)

Question 12

Lat Dors: Innervation

Answer 12

Thoracodorsal nerve

Question 13

Lat Dors: Primary Blood Supply

Answer 13

Thoracodorsal Vessels

Question 14

Levator Scapulae Muscle

Answer 14

Question 15

Lev Scap: Origin and Insertion

Answer 15

Origin: Transverse Processes of the upper 4 cervical vertebrae

Insertion: Vertebral Border of the scapula above the spine

Question 16

Lev Scap: Actions

Answer 16

Elevates Scapula

Question 17

Lev Scap: Innervation

Answer 17

Nerves C3, C4 of cervical plexus and the dorsal scapular nerve

Question 18

Lev Scap: Blood Supply

Answer 18

Dorsal Scapular Vessels

Question 19

Rhomboideus Major

Answer 19

Question 20

Rhomboideus Major: Origin and Insertion

Answer 20

Origin: Spinous Processes from C7-T4

Insertion: Vertebral border of scapula below the spine

Question 21

Rhomboideus Minor

Answer 21

Question 22

Rhomboideus Minor: Origin and Insertion

Answer 22

Origin: Lower part of the ligaentum nuchae and spine of C7

Insertion: Vertebral border of scapula at the level of the spine

Question 23

Rhom Major and Minor: Innervation

Answer 23

Dorsal Scapular Nerve

Question 24

Rhom Major and Minor: Primary Blood Supply:

Answer 24

Dorsal Scapular Vessels

Question 25

Rhom Major and Minor: Point of Action

Answer 25

Retract the shoulder by drawing the scapulae toward each oth

Question 26

Triangle of Auscultation

Answer 26

Void space between the scapula (lateral border), trapezius(medial border) and latissmus dorsi (inferior border)