Torso

Question 1

Erector Spinae

Answer 1

Origin: Spinous T9-12
Insertion: Spinous of cervical and thoracic vertebrae
Action: extend vertebral column
Innervation: posterior branch of spinal nerve

• back muscle

Question 2

Iliocostalis

Answer 2

Origin:
Insertion:
Action:
Innervation:

• Back muscle (erector spinae)

Question 3

Longissimis

Answer 3

Origin: TP
Insertion: TP
Action: extend vertebral column
Innervation: posterior branch of spinal nerve

• Back muscle (erector spinae)

Question 4

Spinalis

Answer 4

Origin: Spinous
Insertion: Spinous
Action: extend vertebral column
Innervation: posterior branch of spinal nerve

• back muscle (erector spinae)

Question 5

Latissimus dorsi

Answer 5

Origin: Spinous T6-T12, thoracolumbar fascia, iliac crest, inferior 3 or 4 ribs
Insertion: humerus
Action: pulls forelimb dorsally and caudally
Innervation: thoracodorsal nerve

• Back muscle (erector spinae)

Question 6

Multifidus

Answer 6

Origin: sacrum, erector spinae aponeurosis, PSIS, iliac crest
Insertion: spinous process
Action: stabilize vertebrae
Innervation: posterior branch of spinal nerve

• Back muscle (transversospinalis)

Question 7

Interspinalis

Answer 7

Origin: SP
Insertion: SP
Action: Extension, flexion and rotation of spinal column
Innervation: Posterior rami of spinal nerves

• Back muscle

Question 8

Intertransversarii

Answer 8

Origin: TP
Insertion: TP above
Action: Lateral flexion of trunk
Innervation: anterior rami of spinal nerves

• Back muscle

Question 9

Splenius capitis

Answer 9

Origin: Ligamentum nuchae, SP C7-T6
Insertion: Mastoid
Action: Extend, rotate, laterally flex head
Innervation: C3, C4

• Back muscle

Question 10

Splenius Cervicis

Answer 10

Origin: SP T3-T6
Insertion: TP of C1-3
Action: ??
Innervation: C5, C6

• Back muscle

Question 11

Transverse thoracis

Answer 11

Origin: Costal cartilage last 3-4 ribs, body of sternum, xyphoid
Insertion: Ribs/ costal cartilage 2-6
Action: depresses ribs
Innervation: intercostal nerves

• Chest muscle