Superficial Back

Question 1

Innervation of Latissimus Dorsi

Answer 1

Thoracodorsal Nerve (C6-8)

Question 2

Innervation of Trapezius

Answer 2

(S) C3-C4
(M) Accessory Nerve (CN XI)

Question 3

Innervation of Levator Scapulae

Answer 3

(S) C3-C4
(M) Dorsal Scapular Nerve (Originating C4-C5)

Question 4

Innervation of Rhomboids

Answer 4

(M) Dorsal Scapular Nerve (originates from C4-C5)

(S) C3-4

Question 5

Innervation of Pectoralis Major

Answer 5

(M) Lateral and Medial Pectoralis Nerve

(originates: Clavicular Head C5-7, Sternocostal Head C8-T1)

Question 6

Innervation of Pectoralis Minor

Answer 6

(M) Lateral and Medial Pectoralis Nerve

(originates: C5-T1)

Question 7

Innervation of Serratus Anterior

Answer 7

(M) Long Thoracic Nerve
(originates from C5-C7)

Question 8

Innervation of Subclavius

Answer 8

(M) Subclavian Nerve
(originates from C5-6)

Question 9

Bony Landmarks for Latissimus Dorsi

Answer 9

Spinous Process of Thoracic Spine
Thoracolumbar Fascia
Illiac Crest

Floor of the Intertubercular Sulcus of the Humerus

Question 10

Bony Landmarks Trapezius

Answer 10

Superior Nuchal Line
External Occipital Protuberance
Ligament Nuchal
Spinous Process of Cervical & Thoracic Spine

Clavicle
Acromion
Spine of Scapula

Question 11

Bony Landmarks of Levator Scapulae

Answer 11

Transverse Process C1-C4

Superior Angle & Superomedial Boarder of Scapula

Question 12

Bony Landmarks of Rhomboid

Answer 12

Minor: Ligament Nuchal
Spinous Process C7-T1
Major: Spinous Process T2-T5

Medial Boarder of Scap

Question 13

Bony Landmarks of Pectoralis Major

Answer 13

Clavicle
Sternum
Costal Cartilages
Aponeurosis of the External Oblique

Lateral Lip of the Intertubercular Sulcus of Humerus

Question 14

Bony Landmarks of Pectoralis Minor

Answer 14

Outer Surface of Ribs 3-5

Coracoid Process

Question 15

Bony Landmarks of Serratus Anterior

Answer 15

Outer Surface & Superior Boarders of Ribs 1-10

Costal Surface of the Medial Boarder of the Scapula

Question 16

Bony Landmarks of Subclavius

Answer 16

1st Rib & Cartilage

Undersurface of Clavicle

Question 17

Actions of Latissimus Dorsi

Answer 17

Adduction
Extension
Medial/Internal Rotation
(Of Humerus)

Question 18

Actions of Trapezius

Answer 18

Upper: Elevation & Upward Rotation
Mid: Retraction
Lower: Depress & Upward Rotation

Question 19

Actions of Levator Scapulae

Answer 19

Elevate
Downward Rotation
(Of Scapulae)

Question 20

Action of Rhomboids

Answer 20

Retraction
Elevation (Minor)
Downward Rotation
(Of Scapulae)

Question 21

Actions of Pectoralis Major

Answer 21

Adduction
Flexion
Medial/Internal Rotation
(Of Humerus)

Sternocostal portion assists with extension of the flexed arm

Question 22

Actions of Pectoralis Minor

Answer 22

Anterior Tilt of Scapula
Depression of Shoulder
Forced Inspiration

Question 23

Actions of Serratus Anterior

Answer 23

Scapula Protraction
Upward Rotation of Scapula

Question 24

Actions of Subclavius

Answer 24

Depression
Stabilizes
(Clavicle)

Question 25

What are Extrinsic back muscles?
Which muscles are they?
What are their functions/actions?

Answer 25

Superficial = Limb Movement

Trapezius
Latissimus Dorsi
Levator Scapula
Rhomboids

Intermediate = Respiration

Serratus Posterior Superior
Serratus Posterior Inverior

Question 26

What are Intrinsic Back Muscles?
What muscles are they?
Function?

Answer 26

Function = Vertebral Column Movement & Stabilization

Superficial: Splenius (Capitus & Cervics)
Intermediate: Erector Spinae (Spinalis, Longissimus, Iliocostalis)
Deep: Transversospinales (Semispinalis, Multifidus, Rotatores)