Superficial Muscles

Question 1

Superficial Muscles of the Back

Answer 1

They connect the upper extremities to the trunk
(vertebral column)

• Lastissimus Dorsi Muscle
• Trapezius Muscle
• Levator Scapulae Muscle
• Rhomboid Minor Muscle
• Rhomboid Major Muscle
• Serratus Posterior Superior Muscle
• Serratus Posterior Inferior Muscle

Question 2

Latissimus dorsi

Answer 2

Large, triangular muscle
which forms, with the teres
major muscle, the posterior axillary fold.

N-thoracodorsal n.

F-adduction and extension
of the UE

O-spinous processes of the lumbar vertebrae, lower 6 thoracic vertebrae, thoracolumbar fascia, iliac crest

I-floor of the bicipital tuberosity of humerus

Question 3

Trapezius muscle

Answer 3

N-accessory spinal (CN
XI), and cervical plexus

F-elevates the shoulder,
pulls the scapula backwards

O-spinous process of C1,
spinous processes of T1- T12, ligamentum nuchae, superior nuchal line

I-lateral 1/3 of the clavicle,
acromion, crest of the scapula

Question 4

Triangle of Auscultation

Answer 4

Trapezius (lat. border) = medial side

Latissimus dorsi (superior border) = base

Medial border of scapula =
lateral side

Floor = rhomboid major, ICS6

Question 5

Lumbar triangle of Petit

Answer 5

Iliac crest = inferior border

Lateral border of latissimus dorsi = medial border

Posterior border of external abdominal oblique = lateral border

Floor = internal abdominal oblique *It may be a site for abdominal hernias.

Question 6

Thoracolumbar fascia (lumbodorsal fascia)

Answer 6

Invests the deep muscles of the back

Provides origins for the latissimus dorsi, internal abdominal oblique, and transversus abdominis muscles

Question 7

Levator scapulae

Answer 7

N- C3-C4

F- Elevation of the scapula

O- Posterior tubercles of transverse processes of C1- C4

I- Superior angle of the scapula and upper medial border of the scapula

Question 8

Rhomboid minor

Answer 8

N- Dorsal scapular nerve

F- Retract and fix the scapula

O- Spinous process of C7,
ligamentum nuchae, T1

I- Spine of the scapula

Question 9

Rhomboid major

Answer 9

N- Dorsal scapular nerve

F - Retract and fix the scapula

O- Spinous processes of T2-T5

I- Medial border of scapula

Question 10

Serratus posterior superior

Answer 10

Deep to the rhomboids.

C7, ribs 2-5, ligamentum nuchae.

N- Supplied by ventral rami of C8-T3

Question 11

Serratus posterior inferior

Answer 11

Deep to the lastissimus
dorsi

Attaches to the lower 4 ribs

N- Supplied by ventral rami of T9-T11