Axial musculature II

Question 1

Trapezius

Answer 1

Origin: External occipital protuberance
insertion: Scapula and clavicle
Innervation: N XI (Accessory)

Question 2

Latissimus Dorsi

Answer 2

Origin: Vert column, Iliac Crest, and ribs
Insertion: humerus
Innervation: Thoracodorsal N

Question 3

Levator scapulae

Answer 3

Origin: first 4 cervical vertebrae
Insertion: Scapula
Innervation: C3, C4, C5
Action: elevates scapula

Question 4

Rhomboid major

Answer 4

origin: thoracic vertebra
insertion: scapula
innervation: C5 (dorsal scapular)
action: adducts scapula

Question 5

Rhomboid minor

Answer 5

Origin: C2-T1

insertion: scapula
innervation: C5 (dorsal scapular)
action: adducts scapula

Question 6

Pectoralis minor

Answer 6

Origin: ribs and external intercostals

insertion: coracoid process of scapula
innervation: medial pectoral nerve
action: stabilize scapula by drawing it anteriorly

Question 7

serratus anterior

Answer 7

origin: ribs
insertion: scapula
innervation: long thoracic nerve (C5-C7)
action: protracts the scapula(pulls it forward)

Question 8

Splenius

Answer 8

origin: vertebrae
insertion: mastoid process, occipital bone, cervical vertebrae
innervation: dorsal rami
action: rotates the head to the same side

Question 9

semispinalis

Answer 9

origin: vertebra
insertion: occipitus
innervation: dorsal rami
action: extends the head (prevents from nodding off)

Question 10

spinalis thoracis

Answer 10

Origin: inferior thoracic and superior lumbar

insertion: superior thoracic vertebrae
innervation: back dorsal rami
action: extend back

Question 11

longissimus thoracis

Answer 11

origin: back dorsal rami
insertion: superior thoracic and lumbar and ribs
innervation: back dorsal rami
action: extend back

Question 12

Iliocostalis lumborium

Answer 12

origin: iliac and sacaral crest, lumbar spinous processes
insertion: inferior surfaces of ribs
innervation: back dorsal rami
action: extend back

Question 13

multifidus

Answer 13

origin: sacrum and vertebrae
insertion: back
innervation: spinal nerves
action: extend and rotate the spinal column to the opposite side

Question 14

diaphragm

Answer 14

origin: xiphoid process and ribs
insertion: central tendinous sheet
innervation: phrenic (C3, C4, C5)
action: expands thoracic cavity
compresses abdominopelvic

Question 15

iliopsoas (iliacus)

Answer 15

origin: lumbar vertebra
insertion: lesser trochanter
innervation: femoral nerve (L2-L4) ventral primary rami
action: flexion at the hip

Question 16

internal oblique

Answer 16

origin: thoracolumbar fascia and iliac crest
insertion: internal oblique aponeurosis
action: compresses abdomen, rotates vertebral column to the same side