Origins

Question 1

What is the origin of rectus abdominus

Answer 1

Lateral head: pubic crest and pubic tubercle

Medial head: anterior region of pubis symphysis

Question 2

What is the origin of transversus abdominus

Answer 2

Costal cartlidge of ribs 7-12
Thoracolumbar fascia (deep)
Iliac crest
ASIS
Iliopsoas fascia

Question 3

What is the origin of external oblique

Answer 3

Ribs 5-12

Question 4

What is the origin of internal oblique

Answer 4

Thoracolumbar fascia (deep)
Iliac crest
ASIS
Iliopsoas fascia

Question 5

What is the origin of diaphragm

Answer 5

Costal: ribs 7-12
Lumbar: L1-L3 bodies and IV discs, anterior longitudinal ligament
Sternal: xiphoid process

Question 6

What is the origin of psoas major

Answer 6

Superficial layer: vertebral bodies and IV discs of T12-L4

Deep layer: costal processes of L1-L4

Question 7

What is the origin of psoas minor

Answer 7

Vertebral bodies and IV discs of T12-L1

Question 8

What is the origin of ilacus

Answer 8

Iliac fossa

Question 9

What is the origin of quadratus lumborum

Answer 9

Iliac crest and iliolumbar ligament

Question 10

What is the origin of external, internal, innermost intercostals

Answer 10

Lower border of rib to superior border of rib above
(External: run oblique down)
(Internal and innermost: run oblique up)

Question 11

What is the origin of transversus thoracis

Answer 11

Sternum and xiphoid process

Question 12

What is the origin of diaphragm hiatus

Answer 12

Esophageal, aortic, CAVAL opening: lumbar part of diaphragm

Question 13

What is the origin of diaphragm crura

Answer 13

L and R lumbar part of diaphragm

Question 14

What is the origin of levator ani

Answer 14

Puborectalis: superior pubic Ramus
Pubococcegeous: pubis( lateral to puborectalis )
Iliococcygeous: tendinous arch

Question 15

What is the origin of coccygeus

Answer 15

Coccyx

Question 16

What is the origin of piriformis

Answer 16

Pelvic surface of sacrum

Question 17

What is the origin of Obturator internus

Answer 17

Obturator membrane

Question 18

What is the origin of ishiocavernosus

Answer 18

Ishial spine

Question 19

What is the origin of bulbospongiosus

Answer 19

Runs anteriorly from perineal body to clitoris or penile raphe

Question 20

What is the origin of superior transverse perineal

Answer 20

Ishial Ramus

Question 21

What is the origin of external anal spinchter

Answer 21

Encircles anus( posteriorly from perineal body to anococcygeous)

Question 22

What is the origin of omohyoid

Answer 22

Superior border of scapula

Question 23

What is the origin of sternohyoid

Answer 23

Manubrium and sternoclavicular joint

Question 24

What is the origin of sternothyroid

Answer 24

Posterior surface of manubrium

Question 25

What is the origin of thyrohyoid

Answer 25

Thyroid cartlidge

Question 26

What is the origin of masseter

Answer 26

Zygomatic arch

Question 27

What is the origin of temporalis

Answer 27

Inferior temporal line of temporal Fossa

Question 28

What is the origin of lateral pterygoid

Answer 28

Superior: greater wing of sphenoid bone Inferior: lateral pterygoid plate

Question 29

What is the origin of medial pterygoid

Answer 29

Superficial: maxilla Deep: medial surface of lateral pterygoid plate, pterygoid Fossa

Question 30

What is the origin of platysma

Answer 30

Skin on neck

Question 31

What is the origin of digastric

Answer 31

Anterior belly: digastric Fossa of mandible | Posterior belly: mandibular notch of temporal bone

Question 32

What is the origin of Stylohyoid

Answer 32

Styloid process of temporal bone

Question 33

What is the origin of mylohyoid

Answer 33

Mylohyoid line of mandible

Question 34

What is the origin of geniohyoid

Answer 34

Inferior mental spine of mandible