Spine and Pelvis OINAs

Question 1

Temporalis

Answer 1

O: Temporal fossa
I: Coronoid process, ramus of mandible
N: CN V
A: Elevation, retraction mandible

Question 2

Masseter

Answer 2

O: Zygomatic arch
I: Ramus, coronoid process of mandible
N: CN V
A: Elevation, protrusion mandible

Question 3

Medial pterygoid

Answer 3

O: Sphenoid, palatine, pterygoid fossa
I: Mandibular ramus
N: CN V
A:
-Bilateral: elevation mandible
-Unilateral: lateral deviation jaw to contralateral

Question 4

Lateral pterygoid

Answer 4

O:
-Superior head: greater wing sphenoid
-Inferior head: lateral pterygoid of sphenoid
I:
-Superior head: capsule, articular disk TMJ
-Inferior head: neck of mandible
N: CN V
A: Protraction of mandible

Question 5

Scalene Anterior

Answer 5

O (Sup): Transverse processes C3-C6
I (Inf): 1st rib
N: VPR of lower cervical n.
A: Elevation 1st rib, ipsilateral lateral flexion, contralateral rotation neck

Question 6

Scalene Middle

Answer 6

O (Sup): Transverse processes C2-C7
I (Inf): 1st rib
N: VPR of lower cervical n.
A: Elevation 1st rib, ipsilateral lateral flexion, contralateral rotation neck

Question 7

Scalene Posterior

Answer 7

O (Sup): Transverse processes C4-C6
I (Inf): 2nd rib
N: VPR of lower cervical n.
A: Elevation 2nd rib, ipsilateral lateral flexion, contralateral rotation neck

Question 8

Sternocleidomastoid

Answer 8

O:
-Sternal head: anterior manubrium
-Clavicular head: medial 1/3 clavicle
I: Mastoid process, superior nuchal line
N: CN XI
A:
-Unilaterally: ipsilateral lateral flexion, contralateral rotation
-Bilaterally: flexion neck

Question 9

Splenius capitis

Answer 9

O: Nuchal ligament and spinous processes of C3-C7 vertebrae
I: Mastoid process, superior nuchal line
N: Dorsal primary rami of spinal n C3-C6
A:
-Bilateral: extension neck/ head
-Unilateral: lateral flexion, ipsilateral rotation head, neck

Question 10

Splenius cervicis

Answer 10

O: Spinous processes of T3-T6 vertebrae
I: Transverse processes of C1-C3 vertebrae
N: Dorsal primary rami of spinal n C5-C7
A:
-Bilateral: extension neck/head
-Unilateral: lateral flexion, ipsilateral rotation head/neck

Question 11

External Oblique

Answer 11

O: External surfaces of ribs 5-12
I: Linea alba, pubic tubercle and anterior 1/2 iliac crest
N: Ventral rami of T8-12 (note: T12 = subcostal n)
A: Flexion, rotation trunk; compress/support abdominal viscera

Question 12

Internal Oblique

Answer 12

O: Thoracolumbar fascia, anterior 2/3 iliac crest, inguinal ligament
I: Inferior borders ribs 10-12, linea alba, pubis
N: Ventral rami of T8-12
A: Flexion, rotation trunk; compression/support abdominal viscera

Question 13

Transverse Abdominis

Answer 13

O: Intercostal cartilages 7-12, thoracolumbar fascia, iliac, inguinal ligament
I: Linea alba, pubic crest, pubis
N: Ventral rami of T8-12
A: Compression/support abdominal viscera

Question 14

Quadratus Lumborum

Answer 14

O: Iliac crest, iliolumbar ligament
I: Rib 12, TP of L1-L4
N: Anterior rami T12-L4
A: Trunk extension, ipsilateral trunk lateral flexion

Question 15

Rectus Abdominis

Answer 15

O: Pubic symphysis, pubic crest
I: Xiphoid process, coastal cartilage 5-7
N: Ventral rami of T7-12
A: Flexion trunk; compression/support abdominal viscera