Trunk myology

Question 1

Rectus Abdominus

Answer 1

o: pubic crest, pubic tubercle and pubic symphesis, i costal cartilage of 5th to 7th ribs, xiphoid process

Question 2

external oblique o i

Answer 2

o: muscular slips from the outer surfaces of the lower eight ribs 5th to 12, i lateral lip of the iliac crest aponeurosis ending in linea alba

Question 3

internal oblique

Answer 3

thoracolumbar fascia; anterior 2/3 of the iliac crest; lateral 2/3 of the injinal ligament, i inferior border of the lower three or four ribs aponeurosis ending in linea alba; pubic crest

Question 4

transversus abdominis

Answer 4

thoracolumbar fascia medial lip of iliac crest; lateral 1/3 of inguinal ligament; costal carilage lower 6 ribs, i: abdominal apooneurosis/linea alba

Question 5

ql

Answer 5

ileolumbar ligament and posterior iliac crest of the interior side, i transverse process of 1-4 lumbar vertebrae and inferior border of 12th rib

Question 6

external intercostal

Answer 6

inferior margin of rib above, i superior margin of rib below

Question 7

internal intercostal

Answer 7

o: lateral edge of costal groove of rib above i: superior margin of rib below deep to teh attachment of the related external intercostal

Question 8

transversus thoracis

Answer 8

inferior margins and internal surfaces of costal cartilages of 2nd to 6th ribs i: inferior aspect of deep surface of body of sternum, xiphoid process and costal carilage of 4th to 12th ribs

Question 9

levatores costarum

Answer 9

transverse processes of c7 and t1-t11 i: subajecent ribs betweeen tubercle and angle

Question 10

diaphragm

Answer 10

o: costal attachement: inner surfaces of the lower six ribs; lumbar attachement: upper two or three lumbar vertebrae: sternal attachem: inner part of xiphoid process-i central tendon of diphragm

Question 11

sternothyroid o:i

Answer 11

o: posterior surface of manubrium of sternum i: obique line of lamina of thyroid cartilage

Question 12

sternothyroid a

Answer 12

depresses the larynx (thyroid cartilage) and hyoid

Question 13

omohyoid o:i

Answer 13

superior border of scapula medial to suprascapular notch i: lower border of body of hyoid bone

Question 14

omohyoid a

Answer 14

depression and fixation of hyoid bone

Question 15

thyrohyoid o:i

Answer 15

oblique line on lamina of thyroid cartilage, i greater horn and adjacent aspect of body hyoid bone

Question 16

thyrohyoid a

Answer 16

depresses hyoid bone, buyt when hyoid bone is fixed elevates larynx

Question 17

digasrtic o i

Answer 17

anterior belly: digastric fossa on lower inside of mandible; posterior belly- mastoid notch on medial side of mastoid process of temportal bone– deep to scm and sc i: attachement of tendon between two bellies to body of hyoid bone

Question 18

mylohyoid o i

Answer 18

line of undersid of mandible, i body of hyoid bone and fibers from muscle on opposite side

Question 19

a mylohyoid

Answer 19

elevation of hyoid bone, support and elevation of floor of the mouth, depress the mandible

Question 20

masseter o a

Answer 20

zygomatic arch and the maxillary process of the zygomatic bone, i ramus of mandible and coronoid process

Question 21

temporalis

Answer 21

o: bone of temporal fossa and temporal fascia, i coronoid process of mandible and anterior margin of ramus of mandible- deep temporal nerves CN V

Question 22

lateral pterygoid

Answer 22

o superior head: infratemporal surface and crest of greater sphenoid wing, inferior head: lateral surface of lateral pterygoid plate of sphenoid bone, i capsule of temporomandibular joint, articular disk

Question 23

medial pterygoid o i

Answer 23

deep head-medial surface of lateral pterygoid plate and pyramidal process of palatine bone, superficial head-tuberosity and pyramidal process of maxilla, I medial surface of ramus of mandible, inferior to mandibular foramen