Attachments - Trunk Muscles

Question 1

intercostal (external)

Answer 1

from rib to rib oriented from superior-lateral to inferior-medial

Question 2

intercostal (internal and innermost)

Answer 2

from rib to rib oriented superior-medial to inferior-lateral

Question 3

transversus thoracis

Answer 3

from posterior sternum to costal cartilages

Question 4

cremaster

Answer 4

from the medial edge of the internal oblique to spermatic cord

Question 5

diaphragm

Answer 5

from xiphoid process, inner surface of the lower ribs and costal cartilages, medial and lateral arcuate ligaments and lumbar vertebrae via the crura to the central tendon

Question 6

external oblique

Answer 6

from lower 8 ribs to iliac crest and rectus sheath

Question 7

internal oblique

Answer 7

from thoracolumbar fascia to inguinal ligament, iliac crest and rectus sheath

Question 8

quadratus lumborum

Answer 8

from 12th rib to iliolumbar ligament and iliac crest

Question 9

rectus abdominis

Answer 9

from xiphoid process and adjacent costal cartilages to pubic crest and tubercle

Question 10

transversus abdominis

Answer 10

from lower 6 costal cartilages and thoracolumbar fascia to inguinal ligament, iliac crest and rectus sheath

Question 11

coccygeus

Answer 11

from ischial spine and sacrospinous ligament to coccyx

Question 12

levator ani

Answer 12

from pubic symphysis, obturator fascia and ischial spine to midline raphe and anococcygeal ligament

Question 13

bulbospongiosus

Answer 13

in male from median raphe and perineal body to bulb of penis; in female from perineal body to vestibular bulb, vaginal orifice and clitoris

Question 14

ischocavernosus

Answer 14

from ischial tuberosity and ramos to aponeurosis surrounding crus of penis or clitoris

Question 15

sphincter ani externus

Answer 15

from perineal body to anococcygeal raphe

Question 16

sphincter urethrae (male)

Answer 16

surrounds urethra

Question 17

compressor urethrae (female)

Answer 17

from the ischiopubic ramus to midline passing ventral to the urethra and inferior to the sphincter urethrae

Question 18

sphincter urethrovaginalis (female)

Answer 18

from perineal body, surrounds vagina and urethra to meet contralateral muscle inferior to compressor urethrae

Question 19

deep transverse perineus (male)

Answer 19

from ischial tuberosity to perineal body

Question 20

superficial transverse perineus

Answer 20

from ischial tuberosity to perineal body

Question 21

iliacus

Answer 21

from iliac fossa to lesser trochanter

Question 22

psoas

Answer 22

from anterior lumbar transverse processes vertebral bodies and discs to lesser trochanter

Question 23

piriformis

Answer 23

from anterolateral sacrum to greater trochanter

Question 24

obturator internus

Answer 24

from anterolateral wall of the pelvis, obturator foramen and obturator membrane to greater trochanter