Muscles of the Back

Question 1

Lattimus Dorsi Location and Function

Answer 1

Superficial, large, sides of trunk; extension, adduction, rotation of shoulder joint

Question 2

Location and Function of Rhomboid Major and Minor

Answer 2

Superficial, Under the trapezius; retract and rotate the scapula

Question 3

Location and Function of Levator Scapulae

Answer 3

attached to scapula; elevate the scapula

Question 4

Location and Function of Serratus Posterior Superior

Answer 4

Intermediate, under the trapezoids and rhomboids; Elevation of ribs 2-5

Question 5

Location and Function of Erector Spinae: name the three sub-divisions

Answer 5

Deep, surrounding the spine; extend/bend vertebral column; Ilialcostal, longissimus; Spinalis

Question 6

Location and Function of Trapezius

Answer 6

Superficial,center of upper back; shrugging motion

Question 7

Innervation and Blood Supply of Trapezius

Answer 7

Motor: Spinal Accessory Nerve (CN XI)Proprioception: C3, C4; Branch of Transverse cervical artery/ Dorso scapular artery

Question 8

Innervation and Blood Supply of Latissimus Dorsi

Answer 8

Thoracodorsal Nerve (C6-C8); Subscapular artery (thoracodorsal branch)

Question 9

Innervation and Blood Supply of Rhomboid Major and Minor

Answer 9

Dorsal scapular nerve (C4, C5); Dorsal Scapular Artery

Question 10

Innervation and Blood Supply of Levator Scapulae

Answer 10

C3,C4 and Dorsal scapular nerve (C4, C5); Branches from the transverse and ascending cervical arteries

Question 11

Innervation and Blood Supply of Serratus Posterior Superior

Answer 11

(upper thoracic nerves) Intercostal Nerves, root value T2-5; Intercostal arteries

Question 12

Innervation and Blood Supply of Erector Spinae

Answer 12

Dorsal Rami; lateral sacral artery, along with deep cervical arteries, posterior intercostal arteries, lumbar arteries

Question 13

Innervation and Blood Supply of Serratus Posterior Inferior

Answer 13

(lower thoracic nerves) Intercostal nerves, root value T9-12; Inter-costal arteries, intercostal arteries

Question 14

Location and Function of Serratus Posterior Inferior

Answer 14

Intermediate, deep to the lats; Depression of ribs 9-12, prevents ribs from moving when diaphragm expands so that the diaphragm will affect lungs

Question 15

Transversospinalis Location and Function

Answer 15

Rotates and Extended vertebral column, directly lateral to spine

Question 16

Transversospinalis innervation and blood flow

Answer 16

Dorsal Rami; lateral sacral artery, along with deep cervical arteries, posterior intercostal arteries, lumbar arteries